Ancillary Data Inventory

Available ancillary data were collected from each data source at the same time as the root trait data. In FRED 2.0, these ancillary data fall under nine general categories: study location, climate, and soils, plant taxonomy, plant growth form and habit, plant growing conditions, and stand and vegetation characteristics, as well as standardized metadata on the study (e.g., data source references and Digital Object Identifiers for both data source and data set when available) and standardized metadata on the classification and sampling of roots. In total, there are 241 types of ancillary data available in FRED 2.0.

Use the search box if you are interested in seeing whether FRED 2.0 has a particular type of ancillary data, or choose combinations from the Category and Type boxes below and click the "Filter" button to view subsets of the data.

Category Type Ancillary Data Column ID Description Total Observations
Study metadata Data attribution Abbreviated article citation F00003 Abbreviated citation of contributing data source, e.g. “Doe et al 2015” 57190
Stand and vegetation characteristics Aboveground biomass Aboveground annual C production F01279 Amount of aboveground plant carbon produced in one year per ground area. 98
Stand and vegetation characteristics Aboveground biomass Aboveground biomass per ground area F01267 Total biomass of aboveground plant parts, not including inflorescences, per square meter of ground area. 1196
Stand and vegetation characteristics Aboveground biomass Aboveground biomass per plant F01269 Total aboveground mass of an individual plant. 809
Stand and vegetation characteristics Aboveground biomass Aboveground growth_Annual net primary production per ground area F01273 Aboveground plant biomass produced in one year per ground area. 878
Climate Temperature Air temperature_Coldest month F01230 Mean monthly air temperature for coldest month of year at collection location. 6257
Climate Temperature Air temperature_Warmest month F01229 Mean monthly air temperature for warmest month of year at collection location. 6262
Stand and vegetation characteristics Stem characteristics Basal area_Stem area per ground area F01250 area of plant stems per unit ground area. 1769
Stand and vegetation characteristics Stem characteristics Basal area_Stem area per species per ground area F01247 Area of plant stems of a specific species per unit ground area. 2032
Root sampling metadata Classification Belowground part F00055 Plant parts included in row data. CR = coarse roots (roots with diameter greater than 2 mm), FR = fine roots (roots with diameter less than 2 mm), R = rhizomes, BS = belowground stems, TR = total root system, and TB = total belowground system. “TR” is used when all plant roots are considered but the source does not specify whether or not coarse roots are present. “TB” is used when all belowground plant mass is considered but the source does not name all the plant parts comprised therein. Note that the FR category may contain roots measured from all roots from 0 to 2 mm in diameter, or may contain more restricted measures, e.g. 0 to 1 mm. The specific ranges of diameters included or allowed for a given sample are reported as the upper and lower bounds for root diameter classes in F00949 and F00950, respectively. 57190
Root sampling metadata Sample collection Chamber_Photoperiod F01232 Daily number of hours of light in growth chamber. 1543
Root sampling metadata Sample collection Chamber_Temperature_day F01233 Maximum daytime temperature in controlled growing environment. 2107
Root sampling metadata Sample collection Chamber_Temperature_night F01234 Minimum nighttime temperature in controlled growing environment. 2099
Climate Climate Climate F01227 Climate category of sample collection location as described in original data source. 11557
Climate Climate designation Climate_Koeppen-Geiger classification F01220 Three-letter Koeppen-Geiger climate designation, according to the main latitude and longitude and referenced against classifications from Kottek, M., J. Grieser, C. Beck, B. Rudolf, and F. Rubel, 2006: World Map of the Koppen-Geiger climate classification updated. Meteorol. Z., 15, 259-263. DOI: 10.1127/0941-2948/2006/0130. 56602
Climate Biome Climate_PFT_Biome equivalent_Poulter F01219 Whether the data collection location is tropical, arid, temperate, boreal, or polar, based on Koppen-Geiger designation and Table 3 from the following paper: Poulter B, Ciais P, Hodson E., Lischke H., Maignan F., Plummer S, Zimmermann N.E. 2011. Plant functional type mapping for earth system models. Geoscientific Model Development 4: 993-1010. DOI: 10.5194/gmd-4-993-2011. 56592
Study metadata Data attribution Data set_Citation F00006 If the data are from a previously compiled dataset other than FRED, long-form citation of contributing dataset. 11126
Study metadata Data attribution Data set_DOI F00007 If the data are from a dataset other than FRED, DOI (digital object identifier) of contributing dataset. 12741
Study metadata Data attribution Data source_Citation F00004 Long-form citation of contributing data source. 57190
Study metadata Data attribution Data source_DOI F00005 DOI (digital object identifier) of contributing data source. 53455
Study metadata Duplicate data Data_Duplicate data F00010 “x” denotes that FRED includes duplicates of data. This may be due to the presence of both unpublished and published data, with additional individual replicates corresponding with previously published means, or data provided in multiple sources. 1599
Study metadata Unpublished data Data_Raw or unpublished F00009 Denotes data in row are raw data (including individual replicates corresponding with previously published means) or unpublished. “Main article” means raw data are from the primary published work, “supplement” means data are from a published supplemental document to the article, and “contributed” means the author directly contributed the data to FRED. 25533
Climate Elevation Elevation F01235 Elevation of data collection location. 18987
Root sampling metadata Sample timing Exposition period_Main F01294 In-growth duration, production duration, or decomposition duration in days. If exposition period is presented in months, period in days is estimated. 5064
Location Latitude Latitude F01187 Decimal degrees latitude of data collection location as reported in the original study. 40210
Location Latitude Latitude_Estimated F01189 When original source does not specify coordinates, latitude estimated using available location description. 12688
Location Latitude Latitude_Main F01185 The single latitude value that best describes the data collection location. This is, in order of priority: a single latitude reported in the original study; the average of a minimum and maximum latitude reported in the original study; or an estimated latitude based on the study location. 56649
Stand and vegetation characteristics Plant characteristics Leaf area index (LAI)_Fraction of peak F01256 Leaf area index (LAI) at a specific time divided by the maximum LAI observed during the entire observation period. 126
Stand and vegetation characteristics Plant characteristics Leaf area index (LAI)_Per ground area F01254 Leaf area per unit ground area. 325
Stand and vegetation characteristics Plant characteristics Leaf mass per plant F01271 Total mass of leaves for an individual plant. 4989
Stand and vegetation characteristics Plant characteristics Leaf mass ratio (LMR, LWR) F01272 Leaf mass divided by whole plant weight. Also sometimes referred to as leaf weight ratio. 104
Stand and vegetation characteristics Leaf characteristics Leaf N retranslocation F01264 Rate of retranslocation of nitrogen before abscission of leaves. 44
Location Longitude Longitude F01188 Decimal degrees longitude of data collection location as reported in the original study. 40182
Location Longitude Longitude_Estimated F01190 When original source does not specify coordinates, longitude estimated using available location description. 12700
Location Longitude Longitude_Main F01186 The single longitude value that best describes the collection location. This is, in order of priority: a single latitude reported in the original study; the average of a minimum and maximum latitude reported in the original study; or an estimated latitude based on the study location. 56649
Location Latitude Max_Latitude F01192 Maximum latitude of data collection location when a range of locations is listed in original source. 3577
Location Longitude Max_Longitude F01194 Maximum longitude of data collection location when a range of locations is listed in original source. 3577
Root sampling metadata Classification Max_Root order F00058 For an interval covering a range of root orders, the highest order in the interval. 2811
Climate Temperature Mean annual air temperature (MAT) F01231 Mean annual air temperature of collection location. 25829
Climate Precipitation Mean annual precipitation (MAP) F01228 Mean annual precipitation of sample collection location. 32691
Location Latitude Min_Latitude F01191 Minimum latitude of data collection location when a range of locations is listed in original source. 3577
Location Longitude Min_Longitude F01193 Minimum longitude of data collection location when a range of locations is listed in original source. 3577
Root sampling metadata Classification Min_Root order F00057 For an interval covering a range of root orders, the lowest order in the interval. If this value is unaccompanied by a maximum value in Max_Root order [F00058], all roots in the order above the order specified here are considered. 2841
Root sampling metadata Sample collection Notes_Collection method F00071 Method used to collect data (e.g. minirhizotron, root excavation, sequential coring). 48643
Plant growing conditions Growing conditions Notes_In situ, pot, or hydroponic F01156 Whether plant was studied in field or grown under controlled conditions. 57189
Plant growing conditions Growing conditions Notes_Indoor or outdoor F01158 Whether data were collected indoors or outdoors. 57189
Root sampling metadata Sample timing Notes_Ingrowth duration_d F00076 Number of days between installation and collection of in-growth core or mesh bag. 813
Root sampling metadata Sample timing Notes_Ingrowth duration_mo F01283 Number of months between installation and collection of in-growth core or mesh bag. 376
Location Notes Notes_Location F01221 Miscellaneous information about data collection location, given in original data source. 48868
Root sampling metadata Classification Notes_Method of determining dead roots F00065 Basis for how the authors determined whether roots were living or dead. 8010
Root sampling metadata Sample collection Notes_Miscellaneous notes F00079 Miscellaneous information about data in row. Notes pertaining specifically to location or soil may be located in Notes_Location [F01221] or Notes_Soil type [F00983] instead. 29103
Root sampling metadata Sample timing Notes_Production duration_d F01284 Number of days during which production has been observed. 256
Root sampling metadata Sample timing Notes_Production duration_mo F01280 Number of months during which production has been observed. 249
Root sampling metadata Sample collection Notes_Root decomposition_Litterbag mesh size F00085 Size of mesh used for litterbags or in-growth cores. 4115
Root sampling metadata Sample collection Notes_Root dynamics calculation method F00078 Method used to calculate root dynamics data, such as production, mortality, or turnover.  579
Root sampling metadata Classification Notes_Root order classification scheme F00059 Whether order scheme was centrifugal or centripetal. A centrifugal scheme counts the basal root as first order, with the distal root tip counted as the highest order (coarsest to finest). This is also known as the developmental approach. A centripetal scheme counts the distal tip as the first order, with the basal root counted as the highest order (finest to coarsest). This is also known as the morphometric approach. 10016
Root sampling metadata Sample collection Notes_Root turnover formula F00590 Formula used to determine root turnover. 663
Root sampling metadata Rooting depth Notes_Rooting depth measurement F00961 Measurement used to determine 50_percent and 95_percent rooting depth (e.g., mass, number, length). 567
Study metadata Identification Notes_Row ID F00002 Number to designate specific row. 57190
Root sampling metadata Rooting depth Notes_Sampled to maximum rooting depth (yes, no) F00962 Whether sampling depth exceeds maximum rooting depth. 2669
Taxonomy Community mixtures Notes_Single or multiple species F00027 “multiple species” in this column denotes the data in the row are community-level (i.e., if root samples were taken from a mimultiple speciesed community of species). "Single species" indicates that the data are attributable to a single species. 57189
Study metadata Identification Notes_Site ID F00008 Identifier used in data source to distinguish between multiple data collection sites. 27094
Soils Methodology Notes_Soil K extraction method F00084 Extractive solution or method used to extract soil K. 58
Soils Methodology Notes_Soil NH4 extraction method F00080 Extractive solution or method used to extract soil NH4. 68
Soils Methodology Notes_Soil NO3 extraction method F00081 Extractive solution or method used to extract soil NO3. 50
Soils Methodology Notes_Soil P extraction method F00083 Extractive solution or method used to extract soil P. 235
Soils Methodology Notes_Soil pH_Salt F01403 The type of salt used to measure the data in "Soil pH_Salt" [F01400]. 4623
Soils Methodology Notes_Soil pH_Water F01402 Notes pertaining to data in column F00980 (Soil pH_water). “Method unspecified” means that the data in column F00980 are not confirmed in the source to have been measured in water. “Direct measure of liquid media” means that the plants grew in a liquid medium, such as Hoagland’s solution, which could be measured directly without dilution. 5956
Soils Methodology Notes_Soil PO4 extraction method F00082 Extractive solution or method used to extract soil PO4. 34
Soils Methodology Notes_Soil solution P concentration for P uptake F01034 Molar concentration of phosphorus in solution used for determining phosphorus uptake. 12
Soils Methodology Notes_Soil type F00983 Name of soil in sampling area, as described in original data source. 23212
Root sampling metadata Sample collection Notes_Temperature of respiration chamber F00810 Temperature at which reported respiration rate occurs (i.e., temperature of respiration chamber during observation period). 1380
Plant growing conditions Treatment Notes_Treatment extent F01161 Amount or extent of treatment applied 4226
Plant growing conditions Treatment Notes_Treatment types F01159 Broad description of the type of experimental manipulation involved. This column differs from Notes_Treatments [F01160] in that the latter is a non-standardized description of the treatment in the original data source, whereas “notes_treatment types” attempts to group treatments together into standardized types. 8241
Plant growing conditions Treatment Notes_Treatments F01160 Experimental treatment group of data in row. 8964
Plant growing conditions Treatment Notes_Units for extent of treatment F01162 Unit for value in “extent of treatment”. 4256
Stand and vegetation characteristics Leaf characteristics Photosynthesis per leaf area F01261 Mean net photosynthetic rate at light saturation. 50
Stand and vegetation characteristics Age Plant age interval_Lower bound_d F01168 The minimum plant age when plant age is presented as an interval. 18
Stand and vegetation characteristics Age Plant age interval_Upper bound_d F01169 The maximum plant age when plant age is presented as an interval. 18
Stand and vegetation characteristics Age Plant age_days F01166 Age of plant in days. 271
Stand and vegetation characteristics Age Plant age_years F01167 Age of plant in years. 136
Growth form and habit Plant characteristics Plant growth form_Taseski F01456 Growth form of plant, according to Taseski database. Listed as freestanding, climber, parasite, epiphyte, hemi-epiphyte, holo-mycoheterotroph, or aquatic. Taseski GM, Beloe CJ, Gallagher RV, Chan JY, Dalrymple RL, Cornwell WK. 2019. A global growth-form database for 143,616 vascular plant species. Ecology 100(3):e02614. DOI: 10.1002/ecy.2614. 55513
Growth form and habit Plant characteristics Plant growth form_TRY F00032 Growth form of plant, according to the categorical traits data package from the TRY database: Kattge, J., Bonisch, G., GUnther, A., Wright, I., Zanne, A., Wirth, C., Reich, P.B. and the TRY Consortium (2012) TRY - Categorical Traits Dataset. Data from: TRY - a global database of plant traits. TRY File Archive https://www.try-db.org/TryWeb/Data.php#3If growth form data are not available in TRY categorical traits database, the database from Engemann et al 2016 was used instead when applicable:Engemann K, Sandel B, Boyle BL, Enquist BJ, Jørgensen PM, Kattge J, McGill BJ, Morueta-Holme N, Peet RK, Spencer NJ, Violle C, Wiser SK, Svenning J-C. 2016. A plant growth form dataset for the New World. Ecology. DOI: 10.1002/ecy.1569. "Climber" is used for species designated in the "climber" column of the TRY categorical traits package or designated as "vine" in the Engelmann database, and includes vines and lianas. 56837
Growth form and habit Leaf characteristics Plant leaf habit_TRY F00042 Whether plant is deciduous or evergreen. Data are from the categorical traits data package from the TRY database: Kattge, J., Bonisch, G., GUnther, A., Wright, I., Zanne, A., Wirth, C., Reich, P.B. and the TRY Consortium (2012) TRY - Categorical Traits Dataset. Data from: TRY - a global database of plant traits. TRY File Archive https://www.try-db.org/TryWeb/Data.php#3 28169
Growth form and habit Leaf characteristics Plant leaf type_TRY F00041 Plant leaf type, according to the categorical traits data package from the TRY database: Kattge, J., Bonisch, G., GUnther, A., Wright, I., Zanne, A., Wirth, C., Reich, P.B. and the TRY Consortium (2012) TRY - Categorical Traits Dataset. Data from: TRY - a global database of plant traits. TRY File Archive https://www.try-db.org/TryWeb/Data.php#3 40066
Growth form and habit Leaf characteristics Plant photosynthetic pathway_TRY F00043 Photosynthesis strategy of plant, according to the categorical traits data package from the TRY database: Kattge, J., Bonisch, G., Gunther, A., Wright, I., Zanne, A., Wirth, C., Reich, P.B. and the TRY Consortium (2012) TRY - Categorical Traits Dataset. Data from: TRY - a global database of plant traits. TRY File Archive https://www.try-db.org/TryWeb/Data.php#3. In cases where a species was categorized as having multiple pathways, a single pathway was assigned according to the primary data source, the USDA Plants database (https://plants.usda.gov/), or following a search of primary literature. In these cases, this is indicated in Notes_Miscellaneous notes [F00079]. 37416
Taxonomy Taxonomy Plant taxonomy_Accepted family_TPL F01289 Family of plant according to The Plant List: The Plant List (2013). Version 1.1. Published on the internet; http://www.theplantlist.org/ 43282
Taxonomy Taxonomy Plant taxonomy_Accepted genus_TPL F01286 Genus of plant according to The Plant List: The Plant List (2013). Version 1.1. Published on the Internet; http://www.theplantlist.org/ 42850
Taxonomy Taxonomy Plant taxonomy_Accepted group_TPL F01291 Group of plant according to The Plant List 43461
Taxonomy Taxonomy Plant taxonomy_Accepted order_APW F01290 Order of plant. For Angiosperms, this was determined using the Angiosperm Phylogeny Website (APW): Stevens, P. F. (2001 onwards). Angiosperm Phylogeny Website. Version 14, July 2017 [and more or less continuously updated since]. Online at http://www.mobot.org/MOBOT/research/APweb/. For other plant groups (Gymnosperms, Pteridophytes, and Bryophytes) this was determined first using APW, but in cases where there were discrepancies within APW, and to maintain consistency in suffix nomenclature (i.e. all orders ending in “iales”), additional sources were used including the USDA Plants Database (https://plants.usda.gov/) and the Missouri Botanical Garden (http://www.missouribotanicalgarden.org/plant-science/plant-science/research/plant-identification.aspx). 43292
Taxonomy Taxonomy Plant taxonomy_Accepted species_TPL F01287 Species epithet of plant according to The Plant List: The Plant List (2013). Version 1.1. Published on the Internet; http://www.theplantlist.org/ 42522
Taxonomy Taxonomy Plant taxonomy_Accepted subspecies_TPL F01344 Variety, cultivar, or subspecies of plant according to The Plant List: The Plant List (2013). Version 1.1. Published on the Internet; http://www.theplantlist.org/ 451
Taxonomy Taxonomy Plant taxonomy_Family_Data source F00017 Family of plant, according to data source. 8037
Taxonomy Taxonomy Plant taxonomy_Genus_Data Source F00018 Genus of plant, according to data source. 43234
Taxonomy Taxonomy Plant taxonomy_Species name unresolved F01413 "Unresolved" means species name is listed as unresolved in The Plant List. "Absent" means species name is not listed in the Plant List at all. 1063
Taxonomy Taxonomy Plant taxonomy_Species_Data source F00019 Species epithet of plant, according to data source. 42578
Taxonomy Taxonomy Plant taxonomy_Subspecies_Data source F00020 Variety, cultivar, or subspecies of plant, according to data source. 456
Growth form and habit Plant characteristics Plant woodiness_TRY F00044 Whether plant is woody or non-woody, according to the categorical traits data package from the TRY database: Kattge, J., Bonisch, G., Gunther, A., Wright, I., Zanne, A., Wirth, C., Reich, P.B. and the TRY Consortium (2012) TRY - Categorical Traits Dataset. Data from: TRY - a global database of plant traits. TRY File Archive https://www.try-db.org/TryWeb/Data.php#3 40529
Soils Microbes Rhizosphere soil_Bacterial C content F01123 Concentration of bacterial carbon in rhizosphere soil, estimated based on calculated mean conversion factor of muramic acid to fungal C. 16
Soils Microbes Rhizosphere soil_Fungal C content F01122 Concentration of fungal organic carbon in rhizosphere soil, estimated based on calculated mean conversion factor of glucosamine to fungal C. 16
Soils Microbes Rhizosphere soil_Fungal C/bacterial C ratio F01124 Ratio of rhizosphere soil fungal carbon to rhizosphere soil bacterial carbon. 16
Soils Microbes Rhizosphere soil_Glucosamine content F01120 Concentration of glucosamine measured in rhizosphere soil. 19
Soils Microbes Rhizosphere soil_Muramic acid content F01121 Concentration of muramic acid measured in rhizosphere soil. 19
Root sampling metadata Classification Root age F00061 Age of a sampled root as determined by time since root appearance. 560
Root sampling metadata Classification Root age_Lower bound F00062 Minimum age of roots for which data in row are measured. 20
Root sampling metadata Classification Root age_Upper bound F00063 Maximum age of roots for which data in row are measured. 14
Root sampling metadata Sample timing Root decomposition duration_d F00077 Number of days roots had been decomposing at time of collection. 3118
Root sampling metadata Sample timing Root decomposition duration_mo F01285 Number of months roots had been decomposing at time of collection. 464
Root sampling metadata Classification Root diameter class_Lower bound F00949 For diameter-based categories, the minimum diameter defining the category. 27030
Root sampling metadata Classification Root diameter class_Upper bound F00950 For diameter-based categories, the maximum diameter defining the category. 25858
Root sampling metadata Classification Root functional class F00060 Whether roots are absorptive (orders 1-3 or designated by author's assessment) or transport roots (order >3 or designated by author's assessment). 10815
Root sampling metadata Classification Root heterorhizy_Fibrous or pioneering F00066 Whether observed roots are fibrous or pioneer (framework) roots. 72
Root sampling metadata Classification Root order F00056 Root branching order, with 1 being either the distal (centripetal, i.e. morphometric scheme) or basal root (centrifugal, i.e. developmental scheme) depending on the classification scheme. Refer to F00059 (Root order classification scheme) for further information regarding the classification of root order. 7347
Root sampling metadata Classification Root vitality_Roots living or dead F00064 Whether roots are considered to be alive or dead at time of sampling. 49441
Plant growing conditions Sample timing Sample collection_Day beginning collection F01151 The first day of sample collection for data collected over multiple days. 1300
Plant growing conditions Sample timing Sample collection_Day ending collection F01154 The final day of sample collection for data collected over multiple days. 1285
Plant growing conditions Sample timing Sample collection_Measurement day F01148 Day of sample collection. 11176
Plant growing conditions Sample timing Sample collection_Measurement month F01147 Month of sample collection. 20427
Plant growing conditions Sample timing Sample collection_Measurement year F01146 Year of sample collection. 28029
Plant growing conditions Sample timing Sample collection_Month beginning collection F01150 The first month of sample collection for data collected over multiple months. 13838
Plant growing conditions Sample timing Sample collection_Month ending collection F01153 The final month of sample collection for data collected over multiple months. 13569
Plant growing conditions Sample timing Sample collection_Year beginning collection F01149 The first year of sample collection for data collected over multiple years. 18243
Plant growing conditions Sample timing Sample collection_Year ending collection F01152 The final year of sample collection for data collected over multiple years. 18014
Climate Topography Slope F01236 Slope of data collection location. 4196
Soils Chemistry Soil acid insoluble (lignin) fraction F01016 Percentage of soil that consists of acid-insoluble lignin. 5
Soils Chemistry Soil acid soluble cellulose and hemicellulose fraction F01015 Percentage of soil that consists of acid-soluble cellulose and hemicellulose. 5
Soils Aggregates Soil aggregate stability in sodium oxalate fraction F01107 Aggregate stability in sodium oxalate in percent fine particles in aggregate, determined by method described in: Strickland TC et al. 1988. Soil Sci. Soc. Am. J. 52: 829-833. DOI: 10.2136/sssaj1988.03615995005200030041x 20
Soils Aggregates Soil aggregate stability in water fraction F01106 Aggregate stability in water in percent fine particles in aggregate, determined by method described in: Strickland TC et al. 1988. Soil Sci. Soc. Am. J. 52: 829-833. 20
Soils Chemistry Soil Al content F01022 Concentration of aluminum in soil. 3893
Soils Chemistry Soil Al/Ca ratio F01042 Ratio of aluminum to calcium in soil. 3842
Soils Chemistry Soil Al_Exchangeable Al3+ mass F01066 Concentration of exchangeable Al3+ ions in soil. 32
Soils Chemistry Soil Al_Exchangeable charge F01058 Millimoles of charge of exchangeable aluminum per kilogram of soil. 301
Soils Chemistry Soil Al_saturation F01061 Proportion of soil adsorption complex saturated with Al cations. 211
Soils Chemistry Soil base cation saturation F01062 Proportion of soil adsorption complex saturated with exchangeable cations. 1778
Soils Chemistry Soil base cation saturation_ECEC F01065 Base cation saturation calculated based on effective cation exchange capacity (CEC). 6
Soils Profile Soil block_Height F00074 Height/depth of soil blocks if collected. 1208
Soils Profile Soil block_Length F00072 Length of soil blocks if collected. 1271
Soils Profile Soil block_Volume F00075 Volume of soil blocks if collected. 1176
Soils Profile Soil block_Width F00073 Width of soil blocks if collected. 1271
Soils Structure Soil bulk density F00991 M/V where M is the mass of the soil sample under field conditions and V is the volume of the soil sample. 6725
Soils Aggregates Soil bulk density_Isolated aggregates F00993 Bulk density of isolated soil aggregates (clods). 28
Soils Chemistry Soil C content F00995 Carbon content of soil as determined by soil test or elemental analyzer. 6423
Soils Chemistry Soil C content per ground area F01043 Megagrams of carbon in soil per hectare. 4182
Soils Chemistry Soil C/N ratio F01009 Carbon-to-nitrogen ratio of soil. 5657
Soils Chemistry Soil Ca content F01025 Concentration of calcium in soil. 4106
Soils Chemistry Soil Ca2+ content F01040 Concentration of calcium 2+ ion in soil. 154
Soils Chemistry Soil cation exchange capacity (CEC) F01059 Exchangeable cations that can be absorbed by soil. 1662
Soils Chemistry Soil Ca_Exchangeable Ca2+ mass F01068 Concentration of exchangeable Ca2+ ions in soil. 32
Soils Chemistry Soil Ca_Exchangeable charge F01052 Millimoles of charge of exchangeable calcium per kilogram of soil. 512
Soils Profile Soil depth F00985 Depth of soil profile. 1023
Root sampling metadata Sampling depth Soil depth_Lower sampling depth F00069 The maximum (deeper) depth at which the measurement is taken if soil depth is presented as a categorical interval. 30393
Root sampling metadata Sampling depth Soil depth_Sampling depth F00067 The depth at which the measurement is taken. 374
Root sampling metadata Sampling depth Soil depth_Upper sampling depth F00068 The minimum (shallower) depth at which the measurement is taken if soil depth is presented as a categorical interval. A negative number means the authors consider the interval to begin above the soil layer (typically a litter layer or organic layer). 30061
Soils Chemistry Soil effective cation exchange capacity (ECEC) F01060 The total basic and acidic cations in the soil, extracted with an unbuffered salt. 6
Soils Microbes Soil egosterol content F01114 Concentration of ergosterol in soil, measured with HPLC (high-performance liquid chromatography). 21
Soils Microbes Soil egosterol content_Initial F01118 Ergosterol concentration of soil prior to the sowing of the studied plant. 16
Soils Microbes Soil ergosterol C/microbial biomass C ratio F01117 Proportion of soil ergosterol carbon to soil microbial biomass carbon, expressed as a percentage. 16
Soils Microbes Soil ergosterol C/microbial biomass C ratio_Initial soil F01119 Ratio of ergosterol to microbial biomass C in soil prior to the sowing of the studied plant. 19
Soils Chemistry Soil Fe content F01023 Concentration of iron in soil. 3772
Soils Chemistry Soil Fe_Exchangeable charge F01055 Millimoles of charge of exchangeable iron per kilogram of soil. 6
Soils Profile Soil horizon F00984 Soil horizon from which sample is taken. 1758
Soils Chemistry Soil K content F01037 Potassium concentration of soil as determined by soil test. 5378
Soils Chemistry Soil K_Exchangeable charge F01054 Millimoles of charge of exchangeable potassium per kilogram of soil. 400
Soils Chemistry Soil K_Exchangeable K+ mass F01070 Concentration of exchangeable K+ ions in soil. 32
Soils Chemistry Soil K_Extractable K content F01035 Concentration of potassium in soil extractable by method named in “Notes_Soil K extraction method” column [F00084]. 11
Soils Chemistry Soil Mg content F01024 Concentration of magnesium in soil. 5012
Soils Chemistry Soil Mg2+ content F01041 Concentration of magnesium 2+ ion in soil. 154
Soils Chemistry Soil Mg_Exchangeable charge F01053 Millimoles of charge of exchangeable magnesium per kilogram of soil. 400
Soils Chemistry Soil Mg_Exchangeable Mg2+ mass F01072 Concentration of exchangeable Mg2+ ions in soil. 32
Soils Microbes Soil microbes_Ergosterol content F00664 Mass of ergosterol per gram of soil or growth medium. 28
Soils Microbes Soil microbes_Fungal/bacterial rRNA copy number ratio F00661 Ratio of fungal rRNA gene copy number to bacterial rRNA gene copy number ratio from DNA extraction and PCR runs from soil. 24
Soils Microbes Soil microbes_Microbial biomass C content in soil F01108 Mass of carbon from microbial biomass per gram of soil, measured by fumigation extraction. 27
Soils Microbes Soil microbes_Microbial biomass C content_Initial F01111 Microbial biomass carbon concentration, measured by fumigation extraction, prior to the sowing of the studied plant. 16
Soils Microbes Soil microbes_Microbial biomass C/N ratio F01110 Ratio of carbon to nitrogen in microbial biomass measured by fumigation extraction. 24
Soils Microbes Soil microbes_Microbial biomass C/N ratio_Initial F01113 Microbial biomass carbon-to-nitrogen ratio, measured by fumigation extraction, prior to the sowing of the studied plant. 16
Soils Microbes Soil microbes_Microbial biomass N content in soil F01109 Mass of nitrogen from microbial biomass per gram of soil, measured by fumigation extraction. 24
Soils Microbes Soil microbes_Microbial biomass N content_Initial F01112 Microbial biomass nitrogen concentration, measured by fumigation extraction, prior to the sowing of the studied plant. 16
Soils Microbes Soil microbes_PLFA 18: 2w6.9 mass per soil mass_indicator for soil fungus F01335 Concentration by mass of phospholipid-derived fatty acid 18:2?6.9 in soil, used as an indicator for soil fungal content. 91
Soils Microbes Soil microbes_PLFA 18: 2w6.9 molar concentration per soil mass_indicator for soil fungus F01336 Nanomoles of phospholipid-derived fatty acid 18:2omega6.9 in soil per soil mass, used as an indicator for soil fungal content. This value can be multiplied by 2 to serve as a proxy for soil fungal mass in milligrams. 20
Soils Microbes Soil microbes_PLFA molar concentration per soil mass_indicator for soil microbes F01337 Nanomoles in soil of a phospholipid-derived fatty acid used as an indicator for soil microbes (i15:0, a15:0, i16:0, 16:1omega9, 16:1omega7c, 10Me16:0, cy17:0, i17:0, a17:0, 18:1omega7, or cy19:0?) per gram of soil. 14
Soils Microbes Soil microbes_PLFA proxy for fungal mass per soil mass F00667 Amount of phospholipid fatty acid 18.2omega6.9 lost during soil incubation, used as an indicator of fungal biomass in the soil. 15
Soils Chemistry Soil Mn_Exchangeable charge F01056 Millimoles of charge of exchangeable manganese per kilogram of soil. 24
Soils Chemistry Soil N content F00999 Nitrogen concentration in soil as determined by soil test. 9973
Soils Chemistry Soil N content per ground area F01046 Megagrams of nitrogen in soil per hectare. 3887
Soils Chemistry Soil Na_Exchangeable charge F01057 Millimoles of charge of exchangeable sodium per kilogram of soil. 259
Soils Chemistry Soil Na_Exchangeable Na+ mass F01074 Concentration of exchangeable Na+ ions in soil. 32
Soils Chemistry Soil nonpolar extractable content F01012 Percentage of soil that consists of fats, oils, and waxes. 5
Soils Chemistry Soil N_Annual available N per ground area F01082 Annual amount of N available in soil per hectare. 53
Soils Chemistry Soil N_Available N content F01083 Concentration of plant-available nitrogen in soil. 603
Soils Chemistry Soil N_Daily net soil N mineralization_Lower bound F01128 Lower net nitrogen mineralization per unit soil mass per day. 155
Soils Chemistry Soil N_Daily net soil N mineralization_Upper bound F01129 Upper net nitrogen mineralization per unit soil mass per day. 155
Soils Chemistry Soil N_Exchangeable NH4+ mass F01076 Concentration of exchangeable NH4+ ions in soil. 32
Soils Chemistry Soil N_Exchangeable NO3- mass F01078 Concentration of exchangeable NO3- ions in soil. 32
Soils Chemistry Soil N_Gross N mineralization rate per ground area F01130 Milligrams of soil nitrogen mineralized per square meter of ground area per day. 138
Soils Chemistry Soil N_Gross nitrification rate per ground area F01133 Milligrams of soil mass nitrified per square meter of ground area per day. 138
Soils Chemistry Soil N_Hydrolytic content F01017 Concentration of hydrolytic nitrogen in soil. 15
Soils Chemistry Soil N_Mineral N content F01002 Mineral nitrogen concentration in soil. 4
Soils Chemistry Soil N_NH4 content F01003 Concentration of NH4+ in soil, extracted by solution or method named in “Notes_Soil NH4 extraction method” column [F00080]. 34
Soils Chemistry Soil organic C content F00998 Amount of organic carbon per mass of soil. 1065
Soils Chemistry Soil organic matter content F00989 Percentage of organic matter in the sampled soil. 3240
Soils Chemistry Soil P content F01018 Concentration of phosphorus in the soil. 7378
Soils Chemistry Soil P content per ground area F01049 Megagrams of phosphorus in soil per hectare. 3790
Soils Chemistry Soil pH_Salt F01400 Mean pH of soil at data collection location, measured in a salt solution. 4627
Soils Chemistry Soil pH_Water F00980 Mean pH of soil at data collection location, measured in water. 12690
Soils Chemistry Soil P_Al and Fe bound inorganic P content F01028 Concentration of soil inorganic P loosely bound to aluminum and iron. See Ushio et al. 2015 (DOI: 10.1111/1365-2435.12424) for further information. 2
Soils Chemistry Soil P_Available P content F01084 Concentration of plant-available phosphorus in soil. 1063
Soils Chemistry Soil P_Available P per ground area F01086 Kilograms of plant-available phosphorus per hectare soil. 8
Soils Chemistry Soil P_Exchangeable PO43- mass F01080 Concentration of exchangeable PO43- ions in soil. 32
Soils Chemistry Soil P_Inorganic P content_HCl extraction F01026 Concentration of soil inorganic P extractable by diluted HCl. See Ushio et al. 2015 (DOI: 10.1111/1365-2435.12424) for further information. 3
Soils Chemistry Soil P_Inorganic P content_NaHCO3 extraction F01027 Concentration of soil inorganic P extractable by NaHCO3. 2
Soils Chemistry Soil P_Occluded inorganic P content F01029 Concentration of occluded inorganic phosphorus in soil. 3
Soils Chemistry Soil P_Organic P content_HCl extraction F01032 Concentration of soil organic phosphorus extractable by concentrated hot HCl. See Ushio et al. 2015 (DOI: 10.1111/1365-2435.12424) for further information. 2
Soils Chemistry Soil P_Organic P content_NaHCO3 extraction F01030 Concentration of soil organic P extractable by NaHCO3. 3
Soils Chemistry Soil P_Organic P content_NaOH extraction F01031 Concentration of organic phosphorus extractable by NaOH. See Ushio et al. 2015 (DOI: 10.1111/1365-2435.12424) for further information. 3
Soils Chemistry Soil P_Resin-extractable P F01021 Resin-extractable soil phosphorus per kg of soil. 217
Soils Chemistry Soil P_Total extractable content F01033 Total concentration of soil phosphorus yielded by the extraction method named in “Notes_Soil P extraction method” column [F00083]. 215
Soils Chemistry Soil redox potential F01087 Redox potential of soil. 36
Soils Temperature Soil temperature F01098 Mean temperature of soil at data collection site. 1217
Soils Texture Soil texture F00982 Textural class of soil in sampling area. 9975
Soils Texture Soil texture_Fraction clay F00988 Mean percentage of clay (particles less than 0.002 mm) in the sampled soil. 5826
Soils Texture Soil texture_Fraction sand F00986 Mean percentage of sand (particles 0.05-2 mm) in the sampled soil. 5301
Soils Texture Soil texture_Fraction silt F00987 Mean percentage of silt (particles 0.002-0.05 mm) in the sampled soil. 5091
Soils Chemistry Soil water soluble phenol fraction F01014 Percentage of soil that consists of water-soluble phenols. 5
Soils Chemistry Soil water soluble sugar fraction F01013 Percentage of soil that consists of water-soluble sugars, as determined by a phenol-sulfuric acid assay. 230
Soils Water Soil water_Available soil water at field capacity F01104 Plant-available water in soil at field capacity. 321
Soils Water Soil water_Gravimetric water content F01136 Percentage of bulk soil mass that consists of water under field conditions. 1185
Soils Water Soil water_Matric potential F01103 Matric potential of soil. 52
Soils Water Soil water_Potential (SWP) F01102 Soil water potential, measured with a tensiometer and/or psychrometer. 101
Soils Water Soil water_Storage capacity F01105 Water storage capacity of soil in mm per 120 cm depth. Based on amount of water retained in the soil at matric potentials > -1.5 MPa and 48
Soils Water Soil water_Volumetric content F01099 Percentage of bulk soil volume that consists of water under field conditions. 2988
Climate Water Soil water_Water table depth F01237 Depth of water table below soil surface at sampling time. 1014
Soils Chemistry Soil Zn content F01039 Concentration of zinc in soil. 10
Stand and vegetation characteristics Age Stand age F01165 Time since establishment of tree stand or plantation. 13245
Stand and vegetation characteristics Plant characteristics Stand canopy height F01175 Mean height of canopy at measurement site. 9229
Stand and vegetation characteristics Stem characteristics Stand density_Stem number per ground area F01243 Number of stems per hectare for a given stand of trees. 5984
Stand and vegetation characteristics Stem characteristics Stand density_Stem number per species per ground area F01246 Number of stems per hectare of a specific species for a given stand of trees. 1436
Stand and vegetation characteristics Aboveground biomass Stand fertilizer use efficiency (FUE) F01258 Amount of nitrogen acquired by the plants per unit nitrogen available. 20
Stand and vegetation characteristics Stem characteristics Stem diameter at breast height (DBH) F01170 Mean diameter of plant at breast height. 7411
Stand and vegetation characteristics Stem characteristics Stem mass per plant F01270 Total mass of individual plant stem. 75
Stand and vegetation characteristics Plant characteristics Total biomass per plant F01439 Total aboveground and belowground biomass combined per individual plant. 474
Study metadata Data attribution Version_FRED version number F00001 FRED version number in which data in row first appeared. Version 0 is not acknowledged in version 1 and subsequent versions. 57190