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 Description Species Observations Community Observations Total Observations
Study meta-data Data attribution Abbreviated article citation Abbreviated citation of contributing data source, e.g. 'Doe et al 2015' 23633 11578 35211
Stand and vegetation characteristics Aboveground biomass Aboveground annual C production Amount of aboveground plant carbon produced in one year. 0 98 98
Stand and vegetation characteristics Aboveground biomass Aboveground biomass per ground area Total biomass of aboveground plant parts, not including inflorescences, per square meter of ground area. 503 657 1160
Stand and vegetation characteristics Aboveground biomass Aboveground biomass per plant Total aboveground mass of an individual plant. 13 0 13
Stand and vegetation characteristics Aboveground biomass Aboveground growth_Annual net primary production per ground area Aboveground plant biomass produced in one year per ground area. 131 747 878
Taxonomy Taxonomy Accepted genus_TPL Genus of plant according to The Plant List: The Plant List (2013). Version 1.1. Published on the Internet; http://www.theplantlist.org/ 23633 68 23701
Taxonomy Taxonomy Accepted species_TPL Species epithet of plant according to The Plant List: The Plant List (2013). Version 1.1. Published on the Internet; http://www.theplantlist.org/ 23595 0 23595
Taxonomy Taxonomy Accepted subspecies_TPL 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/ 243 0
Climate Temperature Air temperature_Coldest month Mean monthly air temperature for coldest month of year at collection location. 3843 1468 5311
Climate Temperature Air temperature_Warmest month Mean monthly air temperature for warmest month of year at collection location. 3843 1473 5316
Stand and vegetation characteristics Stem characteristics Basal area_Stem area per ground area area of plant stems per unit ground area. 545 595 1140
Stand and vegetation characteristics Stem characteristics Basal area_Stem area per species per ground area Area of plant stems of a specific species per unit ground area. 1246 231 1477
Root sampling metadata Classification Belowground part Plant parts included in row data. CR = coarse roots (roots with diameter exceeding 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. For this column, fine roots are defined as roots less than 2 mm in diameter. '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. 23601 11578 35179
Root sampling metadata Sample collection Chamber_Photoperiod Daily number of hours of light in growth chamber. 305 10 315
Root sampling metadata Sample collection Chamber_Temperature_day Maximum daytime temperature in controlled growing environment. 877 22 899
Root sampling metadata Sample collection Chamber_Temperature_night Minimum nighttime temperature in controlled growing environment. 869 22 891
Climate Climate Climate Climate category of sample collection location as described in original data source. 5123 1791 6914
Climate Climate designation Climate_Koeppen-Geiger classification 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. 23317 11480 34797
Climate Biome Climate_PFT_Biome equivalent_Poulter 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. 23317 11480 34797
Study meta-data Data attribution Data set_Citation If the data are from a previously compiled dataset other than FRED, long-form citation of contributing dataset. 8217 1932 10149
Study meta-data Data attribution Data set_DOI If the data are from a dataset other than FRED, DOI (digital object identifier) of contributing dataset. 8125 1835 9960
Study meta-data Data attribution Data source_Citation Long-form citation of contributing data source. 23633 11578 35211
Study meta-data Data attribution Data source_DOI DOI (digital object identifier) of contributing data source. 21361 10395 31756
Study meta-data Duplicate data Data_Duplicate data '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. 261 521 782
Study meta-data Unpublished data Data_Raw or unpublished 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. 9858 4776 14634
Climate Elevation Elevation Elevation of data collection location. 7345 3521 10866
Root sampling metadata Sample timing Exposition period_Main In-growth duration, production duration, or decomposition duration in days. If exposition period is presented in months, period in days is estimated. 2000 768 2768
Growth form and habit Leaf characteristics Growth form_Leaf habit Whether plant is deciduous or evergreen. Data are now 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 18798 555 19353
Growth form and habit Leaf characteristics Growth form_Leaf type 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 22714 210 22924
Location Latitude Latitude Decimal degrees latitude of data collection location as reported in the original study. 16613 4737 21350
Location Latitude Latitude_Estimated When original source does not specify coordinates, latitude estimated using available location description. 3786 6408 10194
Location Latitude Latitude_main 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. 23489 11482 34971
Stand and vegetation characteristics Plant characteristics Leaf area index (LAI)_Fraction of peak Leaf area index (LAI) at a specific time divided by the maximum LAI observed during the entire observation period. 171 0 171
Stand and vegetation characteristics Plant characteristics Leaf area index (LAI)_Per ground area Leaf area per unit ground area. 100 146 246
Stand and vegetation characteristics Plant characteristics Leaf mass per plant Total mass of leaves for an individual plant. 4903 86 4989
Stand and vegetation characteristics Leaf characteristics Leaf N retranslocation Rate of retranslocation of nitrogen before abscission of leaves. 20 24 44
Stand and vegetation characteristics Plant characteristics Leaf weight ratio (LWR, LMR) Leaf mass divided by whole plant weight. Also sometimes referred to as leaf weight ratio. 104 0 104
Location Longitude Longitude Decimal degrees longitude of data collection location as reported in the original study. 16613 4721 21334
Location Longitude Longitude_Estimated When original source does not specify coordinates, longitude estimated using available location description. 3786 6408 10194
Location Longitude Longitude_Main 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. 23489 11482 34971
Location Latitude Max_Latitude Maximum latitude of data collection location when a range of locations is listed in original source. 2733 360 3093
Location Longitude Max_Longitude Maximum longitude of data collection location when a range of locations is listed in original source. 2733 360 3093
Root sampling metadata Classification Max_Root order For an interval covering a range of root orders, the highest order in the interval. 2251 152 2403
Climate Water Max_Soil water_Water table depth Maximum depth of water table below soil surface for sampling period. 158 22 180
Climate Temperature Mean annual air temperature (MAT) Mean annual air temperature of collection location. 10929 5997 16926
Climate Precipitation Mean annual precipitation (MAP) Mean annual precipitation of sample collection location. 13510 8611 22121
Location Latitude Min_Latitude Minimum latitude of data collection location when a range of locations is listed in original source. 2733 360 3093
Location Longitude Min_Longitude Minimum longitude of data collection location when a range of locations is listed in original source. 2733 360 3093
Root sampling metadata Classification Min_Root order For an interval covering a range of root orders, the lowest order in the interval. 2281 152 2433
Climate Water Min_Soil water_Water table depth Minimum depth of water table below soil surface for sampling period. 185 27 212
Root sampling metadata Sample collection Notes_Collection method Method used to collect data (e.g. minirhizotron, root excavation, sequential coring). 20530 9775 30305
Plant growing conditions Growing conditions Notes_In situ or pot Whether plant was studied in field or grown under controlled conditions. 23633 11578 35211
Plant growing conditions Growing conditions Notes_Indoor or outdoor Whether data were collected indoors or outdoors. 23633 11578 35211
Root sampling metadata Sample timing Notes_Ingrowth duration_d Number of days between installation and collection of in-growth core or mesh bag. 404 401 805
Root sampling metadata Sample timing Notes_Ingrowth duration_mo Number of months between installation and collection of in-growth core or mesh bag. 220 109 329
Location Notes Notes_Location Miscellaneous information about data collection location, given in original data source. 18344 10024 28368
Root sampling metadata Classification Notes_Method of determining dead roots Basis whereupon the authors determined whether roots were living or dead. 4258 2174 6432
Root sampling metadata Sample collection Notes_Miscellaneous notes 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. 12818 8629 21447
Taxonomy Community mixtures Notes_Mixed community 'x' in this column denotes the data in the row are community-level (i.e., if root samples were taken from a mixed community of species). Blank indicates the data are attributable to a single species. 4 9678 9682
Root sampling metadata Sample timing Notes_Production duration_d Number of days during which production has been observed. 232 6 238
Root sampling metadata Sample timing Notes_Production duration_mo Number of months during which production has been observed. 85 133 218
Root sampling metadata Sample collection Notes_Root decomposition_Litterbag mesh size Size of mesh used for litterbags or in-growth cores . 1231 544 1775
Root sampling metadata Sample collection Notes_Root dynamics calculation method Method used to calculate root dynamics data, such as production, mortality, or turnover. 287 292 579
Root sampling metadata Classification Notes_Root order classification scheme 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. 7136 409 7545
Root sampling metadata Sample collection Notes_Root turnover formula Formula used to determine root turnover. 121 141 262
Root sampling metadata Rooting depth Notes_Rooting depth measurement Measurement used to determine 50_percent and 95_percent rooting depth (e.g., mass, number, length). 4 563 567
Study meta-data Identification Notes_Row ID Number to designate specific row. 23633 11578 35211
Root sampling metadata Rooting depth Notes_Sampled to maximum rooting depth (yes, no) Whether sampling depth exceeds maximum rooting depth. 1825 807 2632
Study meta-data Identification Notes_Site ID Identifier used in data source to distinguish between multiple data collection sites. 6461 7173 13634
Soils Methodology Notes_Soil K extraction method Extractive solution or method used to extract soil K. 24 34 58
Soils Methodology Notes_Soil NH4 extraction method Extractive solution or method used to extract soil NH4. 30 34 64
Soils Methodology Notes_Soil NO3 extraction method Extractive solution or method used to extract soil NO3. 16 34 50
Soils Methodology Notes_Soil P extraction method Extractive solution or method used to extract soil P. 0 235 235
Soils Methodology Notes_Soil pH_Salt The type of salt used to measure the data in "Soil pH_Salt" [F01400] 380 4005 4385
Soils Methodology Notes_Soil pH_Water 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. 3481 1355 4836
Soils Methodology Notes_Soil PO4 extraction method Extractive solution or method used to extract soil PO4. 0 34 34
Soils Methodology Notes_Soil solution P concentration for P uptake Molar concentration of phosphorus in solution used for determining phosphorus uptake. 12 0 12
Soils Methodology Notes_Soil type Name of soil in sampling area, as described in original data source. 9831 4776 14607
Root sampling metadata Sample collection Notes_Temperature of respiration chamber Temperature at which reported respiration rate occurs (i.e., temperature of respiration chamber during observation period). 1154 124 1278
Plant growing conditions Treatment Notes_Treatment extent Amount or extent of treatment applied 1946 1119 3065
Plant growing conditions Treatment Notes_Treatment types 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. 4178 1889 6067
Plant growing conditions Treatment Notes_Treatments Experimental treatment group of data in row. 4284 1945 6229
Plant growing conditions Treatment Notes_Units for extent of treatment Unit for value in 'extent of treatment'. 1982 1127 3109
Stand and vegetation characteristics Leaf characteristics Photosynthesis per leaf area Mean net photosynthetic rate at light saturation. 38 0 38
Stand and vegetation characteristics Age Plant age interval_Lower bound_d The minimum plant age when plant age is presented as an interval. 18 0 18
Stand and vegetation characteristics Age Plant age interval_Upper bound_d The maximum plant age when plant age is presented as an interval. 18 0 18
Stand and vegetation characteristics Age Plant age_days Age of plant in days. 167 0 167
Stand and vegetation characteristics Age Plant age_years Age of plant in years. 97 0 97
Growth form and habit Plant characteristics Plant growth form 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, Jorgensen 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. 22487 769 23256
Growth form and habit Plant characteristics Plant growth form_Woodiness 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 22825 787 23612
Growth form and habit Leaf characteristics Plant photosynthetic pathway 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 21641 154 21795
Taxonomy Taxonomy Plant taxonomy_Family Family of plant according to data source. 7395 122 7517
Taxonomy Taxonomy Plant taxonomy_Family_TPL Family of plant according to The Plant List 23592 496 24088
Taxonomy Taxonomy Plant taxonomy_Genus Genus of plant according to data source. 23633 443 24076
Taxonomy Taxonomy Plant taxonomy_Group_TPL Group of plant according to The Plant List 23372 516 23888
Taxonomy Taxonomy Plant taxonomy_Order_APW 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). 23371 481
Taxonomy Taxonomy Plant taxonomy_Species Species epithet of plant according to data source. 23633 0 23633
Taxonomy Taxonomy Plant taxonomy_Subspecies Variety, cultivar, or subspecies of plant according to data source. 158 0 158
Soils Microbes Rhizosphere soil_Bacterial C content Concentration of bacterial carbon in rhizosphere soil, estimated based on calculated mean conversion factor of muramic acid to fungal C. 15 1 16
Soils Microbes Rhizosphere soil_Fungal C content Concentration of fungal organic carbon in rhizosphere soil, estimated based on calculated mean conversion factor of glucosamine to fungal C. 15 1 16
Soils Microbes Rhizosphere soil_Fungal C/bacterial C ratio Ratio of rhizosphere soil fungal carbon to rhizosphere soil bacterial carbon. 15 1 16
Soils Microbes Rhizosphere soil_Glucosamine content Concentration of glucosamine measured in rhizosphere soil. 15 4 19
Soils Microbes Rhizosphere soil_Muramic acid content Concentration of muramic acid measured in rhizosphere soil. 15 4 19
Root sampling metadata Classification Root age Age of a sampled root as determined by time since root appearance. 473 87 560
Root sampling metadata Classification Root age_Lower bound Minimum age of roots for which data in row are measured. 20 0 20
Root sampling metadata Classification Root age_Upper bound Maximum age of roots for which data in row are measured. 14 0 14
Root sampling metadata Sample timing Root decomposition duration_d Number of days roots have been decomposing at time of collection. 677 110 787
Root sampling metadata Sample timing Root decomposition duration_mo Number of months roots have been decomposing at time of collection. 397 9 406
Root sampling metadata Classification Root diameter class_Lower bound For diameter-based categories, the minimum diameter defining the category. 7334 9246 16580
Root sampling metadata Classification Root diameter class_Upper bound For diameter-based categories, the maximum diameter defining the category. 6439 9016 15455
Root sampling metadata Classification Root functional class Whether roots are absorptive (orders 1-3 or designated by author's assessment) or transport roots (order >3 or designated by author's assessment). 7176 406 7582
Root sampling metadata Classification Root heterorhizy_Fibrous or pioneering Whether observed roots are fibrous or pioneer (framework) roots. 70 0 70
Root sampling metadata Classification Root order Root branching order, with 1 being either the distal (centripetal scheme) or basal root (centrifugal scheme) depending on the classification scheme. Refer to F00059 (Root order classification scheme) for further information regarding the classification of root order. 4747 256 5003
Root sampling metadata Classification Root vitality_Roots living or dead Whether roots are considered to be alive or dead at time of sampling. 17650 9928 27578
Plant growing conditions Sample timing Sample collection_Day beginning collection The first day of sample collection for data collected over multiple days. 919 124 1043
Plant growing conditions Sample timing Sample collection_Day ending collection The final day of sample collection for data collected over multiple days. 913 115 1028
Plant growing conditions Sample timing Sample collection_Measurement day Day of sample collection. 2137 4208 6345
Plant growing conditions Sample timing Sample collection_Measurement month Month of sample collection. 7051 6718 13769
Plant growing conditions Sample timing Sample collection_Measurement year Year of sample collection. 12253 7770 20023
Plant growing conditions Sample timing Sample collection_Month beginning collection The first month of sample collection for data collected over multiple months. 5434 1277 6711
Plant growing conditions Sample timing Sample collection_Month ending collection The final month of sample collection for data collected over multiple months. 5345 1277 6622
Plant growing conditions Sample timing Sample collection_Year beginning collection The first year of sample collection for data collected over multiple years. 9050 2050 11100
Plant growing conditions Sample timing Sample collection_Year ending collection The final year of sample collection for data collected over multiple years. 9004 2047 11051
Climate Topography Slope Slope of data collection location. 796 523 1319
Soils Chemistry Soil acid insoluble (lignin) fraction Percentage of soil that consists of acid-insoluble lignin. 5 0 5
Soils Chemistry Soil acid soluble cellulose and hemicellulose fraction Percentage of soil that consists of acid-soluble cellulose and hemicellulose. 5 0 5
Soils Aggregates Soil aggregate stability in sodium oxalate fraction 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. 0 20 20
Soils Aggregates Soil aggregate stability in water fraction 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. 0 20 20
Soils Chemistry Soil Al content Concentration of aluminum in soil 108 3732 3840
Soils Chemistry Soil Al/Ca ratio Ratio of aluminum to calcium in soil. 108 3732 3840
Soils Chemistry Soil Al_Exchangeable Al3+ mass Concentration of exchangeable Al3+ ions in soil. 0 32 32
Soils Chemistry Soil Al_Exchangeable charge Millimoles of charge of exchangeable aluminum per kilogram of soil. 37 201 238
Soils Chemistry Soil Al_saturation Proportion of soil adsorption complex saturated with Al cations. 0 201 201
Soils Chemistry Soil base cation saturation Proportion of soil adsorption complex saturated with exchangeable cations. 1238 249 1487
Soils Chemistry Soil base cation saturation_ECEC Base cation saturation calculated based on effective cation exchange capacity (CEC). 6 0 6
Soils Profile Soil block_Height Height/depth of soil blocks if collected. 1090 62 1152
Soils Profile Soil block_Length Length of soil blocks if collected. 1149 66 1215
Soils Profile Soil block_Volume Volume of soil blocks if collected. 1058 62 1120
Soils Profile Soil block_Width Width of soil blocks if collected. 1149 66 1215
Soils Structure Soil bulk density M/V where M is the mass of the soil sample under field conditions and V is the volume of the soil sample. 1374 4309 5683
Soils Aggregates Soil bulk density_Isolated aggregates Bulk density of isolated soil aggregates (clods). 0 28 28
Soils Chemistry Soil C content Carbon content of soil as determined by soil test or elemental analyzer. 1635 4342 5977
Soils Chemistry Soil C content per ground area Megagrams of carbon in soil per hectare. 41 3806 3847
Soils Chemistry Soil C/N ratio Carbon-to-nitrogen ratio of soil. 689 4289 4978
Soils Chemistry Soil Ca content Concentration of calcium in soil. 150 3741 3891
Soils Chemistry Soil Ca2+ content Concentration of calcium 2+ ion in soil. 0 154 154
Soils Chemistry Soil cation exchange capacity (CEC) Exchangeable cations that can be absorbed by soil. 1087 24 1111
Soils Chemistry Soil Ca_Exchangeable Ca2+ mass Concentration of exchangeable Ca2+ ions in soil. 0 32 32
Soils Chemistry Soil Ca_Exchangeable charge Millimoles of charge of exchangeable calcium per kilogram of soil. 55 238 293
Soils Profile Soil depth Depth of soil profile. 708 69 777
Root sampling metadata Sampling depth Soil depth_Lower sampling depth The maximum (deeper) depth at which the measurement is taken if soil depth is presented as a categorical interval. 10225 9521 19746
Root sampling metadata Sampling depth Soil depth_Sampling depth The depth at which the measurement is taken. 299 93 392
Root sampling metadata Sampling depth Soil depth_Upper sampling depth 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). 10206 9414 19620
Soils Chemistry Soil effective cation exchange capacity (ECEC) The total basic and acidic cations in the soil, extracted with an unbuffered salt. 6 0 6
Soils Microbes Soil egosterol content Concentration of ergosterol in soil, measured with HPLC (high-performance liquid chromatography). 18 3 21
Soils Microbes Soil egosterol content_Initial Ergosterol concentration of soil prior to the sowing of the studied plant. 15 1 16
Soils Microbes Soil ergosterol C/microbial biomass C ratio Proportion of soil ergosterol carbon to soil microbial biomass carbon, expressed as a percentage. 15 1 16
Soils Microbes Soil ergosterol C/microbial biomass C ratio_Initial soil Ratio of ergosterol to microbial biomass C in soil prior to the sowing of the studied plant. 15 4 19
Soils Chemistry Soil Fe content Concentration of iron in soil. 0 3720 3720
Soils Chemistry Soil Fe_Exchangeable charge Millimoles of charge of exchangeable iron per kilogram of soil. 6 0 6
Soils Profile Soil horizon Soil horizon from which sample is taken. 1234 385 1619
Soils Chemistry Soil K content Potassium concentration of soil as determined by soil test. 1381 3736 5117
Soils Chemistry Soil K_Exchangeable charge Millimoles of charge of exchangeable potassium per kilogram of soil. 24 220 244
Soils Chemistry Soil K_Exchangeable K+ mass Concentration of exchangeable K+ ions in soil. 0 32 32
Soils Chemistry Soil K_Extractable K Concentration of potassium in soil extractable by method named in 'Notes_Soil K extraction method' column [F00084]. 6 5 11
Soils Chemistry Soil Mg content Concentration of magnesium in soil. 1108 3741 4849
Soils Chemistry Soil Mg2+ content Concentration of magnesium 2+ ion in soil. 0 154 154
Soils Chemistry Soil Mg_Exchangeable charge Millimoles of charge of exchangeable magnesium per kilogram of soil. 24 220 244
Soils Chemistry Soil Mg_Exchangeable Mg2+ mass Concentration of exchangeable Mg2+ ions in soil. 0 32 32
Soils Microbes Soil microbes_Ergosterol content Mass of ergosterol per gram of soil or growth medium. 22 6 28
Soils Microbes Soil microbes_Fungal/bacterial rRNA copy number ratio Ratio of fungal rRNA gene copy number to bacterial rRNA gene copy number ratio from DNA extraction and PCR runs from soil. 24 0 24
Soils Microbes Soil microbes_Microbial biomass C content Mass of carbon from microbial biomass per gram of soil, measured by fumigation extraction. 23 4 27
Soils Microbes Soil microbes_Microbial biomass C content_Initial Microbial biomass carbon concentration, measured by fumigation extraction, prior to the sowing of the studied plant. 15 1 16
Soils Microbes Soil microbes_Microbial biomass C/N ratio Ratio of carbon to nitrogen in microbial biomass measured by fumigation extraction. 23 1 24
Soils Microbes Soil microbes_Microbial biomass C/N ratio_Initial Microbial biomass carbon-to-nitrogen ratio, measured by fumigation extraction, prior to the sowing of the studied plant. 15 1 16
Soils Microbes Soil microbes_Microbial biomass N content Mass of nitrogen from microbial biomass per gram of soil, measured by fumigation extraction. 23 1 24
Soils Microbes Soil microbes_Microbial biomass N content_Initial Microbial biomass nitrogen concentration, measured by fumigation extraction, prior to the sowing of the studied plant. 15 1 16
Soils Microbes Soil microbes_PLFA 18: 2w6.9 mass per soil mass_indicator for soil fungus Concentration by mass of phospholipid-derived fatty acid 18:2_6.9 in soil, used as an indicator for soil fungal content. 64 0
Soils Microbes Soil microbes_PLFA 18: 2w6.9 molar concentration per soil mass_indicator for soil fungus 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 0
Soils Microbes Soil microbes_PLFA molar concentration per soil mass_indicator for soil microbes 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 0
Soils Microbes Soil microbes_PLFA proxy for fungal mass per soil mass Amount of phospholipid fatty acid 18.2_6.9 lost during soil incubation, used as an indicator of fungal biomass in the soil. 15 0 15
Soils Chemistry Soil Mn_Exchangeable charge Millimoles of charge of exchangeable manganese per kilogram of soil. 24 0 24
Soils Chemistry Soil N content Nitrogen concentration in soil as determined by soil test. 3782 4545 8327
Soils Chemistry Soil N content per ground area Megagrams of nitrogen in soil per hectare. 41 3802 3843
Soils Chemistry Soil Na_Exchangeable charge Millimoles of charge of exchangeable sodium per kilogram of soil. 24 214 238
Soils Chemistry Soil Na_Exchangeable Na+ mass Concentration of exchangeable Na+ ions in soil. 0 32 32
Soils Chemistry Soil nonpolar extractable content Percentage of soil that consists of fats, oils, and waxes. 5 0 5
Soils Chemistry Soil N_Annual available N per ground area Annual amount of N available in soil per hectare. 25 28 53
Soils Chemistry Soil N_Available N content Concentration of plant-available nitrogen in soil. 515 4 519
Soils Chemistry Soil N_Daily net soil N mineralization_Lower bound Lower net nitrogen mineralization per unit soil mass per day. 149 6 155
Soils Chemistry Soil N_Daily net soil N mineralization_Upper bound Upper net nitrogen mineralization per unit soil mass per day. 149 6 155
Soils Chemistry Soil N_Exchangeable NH4+ mass Concentration of exchangeable NH4+ ions in soil. 0 32 32
Soils Chemistry Soil N_Exchangeable NO3- mass Concentration of exchangeable NO3- ions in soil. 0 32 32
Soils Chemistry Soil N_Gross N mineralization rate per ground area Milligrams of soil nitrogen mineralized per square meter of ground area per day. 0 138 138
Soils Chemistry Soil N_Gross nitrification rate per ground area Milligrams of soil mass nitrified per square meter of ground area per day. 0 138 138
Soils Chemistry Soil N_Hydrolytic content Concentration of hydrolytic nitrogen in soil. 9 6 15
Soils Chemistry Soil N_Mineral N content Mineral nitrogen concentration in soil. 3 1 4
Soils Chemistry Soil N_NH4 content micrograms of soil NH4+ per gram of soil, extracted by solution or method named in 'Notes_Soil NH4 extraction method' column [F00080]. 30 0 30
Soils Chemistry Soil organic C content Amount of organic carbon per kg of soil. 471 124 595
Soils Chemistry Soil organic matter content Percentage of organic matter in the sampled soil. 1587 590 2177
Soils Chemistry Soil P content Concentration of phosphorus in the soil. 2711 4143 6854
Soils Chemistry Soil P content per ground area Megagrams of phosphorus in soil per hectare. 0 3786 3786
Soils Chemistry Soil pH_Salt Mean pH of soil at data collection location, measured in a salt solution. 380 4005 4385
Soils Chemistry Soil pH_Water Mean pH of soil at data collection location, measured in water. 4306 5731 10037
Soils Chemistry Soil P_Al and Fe bound inorganic P content 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. 0 2 2
Soils Chemistry Soil P_Available P content Concentration of plant-available phosphorus in soil. 467 24 491
Soils Chemistry Soil P_Available P per ground area Kilograms of plant-available phosphorus per hectare soil. 8 0 8
Soils Chemistry Soil P_Exchangeable PO43- mass Concentration of exchangeable PO43- ions in soil. 0 32 32
Soils Chemistry Soil P_Inorganic P content_HCl extraction Concentration of soil inorganic P extractable by diluted HCl. See Ushio et al. 2015 (DOI: 10.1111/1365-2435.12424) for further information. 0 3 3
Soils Chemistry Soil P_Inorganic P content_NaHCO3 extraction Concentration of soil inorganic P extractable by NaHCO3. 0 2 2
Soils Chemistry Soil P_Occluded inorganic P content Concentration of occluded inorganic phosphorus in soil. 0 3 3
Soils Chemistry Soil P_Organic P content_HCl extraction Concentration of soil organic phosphorus extractable by concentrated hot HCl. See Ushio et al. 2015 (DOI: 10.1111/1365-2435.12424) for further information. 0 2 2
Soils Chemistry Soil P_Organic P content_NaHCO3 extraction Concentration of soil organic P extractable by NaHCO3. 0 3 3
Soils Chemistry Soil P_Organic P content_NaOH extraction Concentration of organic phosphorus extractable by NaOH. See Ushio et al. 2015 (DOI: 10.1111/1365-2435.12424) for further information. 0 3 3
Soils Chemistry Soil P_Resin-extractable P Resin-extractable soil phosphorus per kg of soil. 0 201 201
Soils Chemistry Soil P_Total extractable content Total concentration of soil phosphorus yielded by the extraction method named in 'Notes_Soil P extraction method' column [F00083]. 14 201 215
Soils Chemistry Soil redox potential Redox potential of soil. 36 0 36
Soils Temperature Soil temperature Mean temperature of soil at data collection site. 746 343 1089
Soils Texture Soil texture Textural class of soil in sampling area. 4676 1998 6674
Soils Texture Soil texture_Fraction clay Mean percentage of clay (particles less than 0.002 mm) in the sampled soil. 2151 1014 3165
Soils Texture Soil texture_Fraction sand Mean percentage of sand (particles 0.05-2 mm) in the sampled soil. 1892 677 2569
Soils Texture Soil texture_Fraction silt Mean percentage of silt (particles 0.002-0.05 mm) in the sampled soil. 1831 740 2571
Soils Chemistry Soil water soluble phenol fraction Percentage of soil that consists of water-soluble phenols. 5 0 5
Soils Chemistry Soil water soluble sugar fraction Percentage of soil that consists of water-soluble sugars, as determined by a phenol-sulfuric acid assay. 230 0 230
Soils Water Soil water_Available soil water at field capacity Plant-available water in soil at field capacity. 66 255 321
Soils Water Soil water_Gravimetric water content Percentage of bulk soil mass that consists of water under field conditions. 387 303 690
Soils Water Soil water_Matric potential Matric potential of soil. 52 0 52
Soils Water Soil water_Potential (SWP) Soil water potential, measured with a tensiometer and/or psychrometer. 101 0 101
Soils Water Soil water_Storage capacity 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 0 48
Soils Water Soil water_Volumetric content Percentage of bulk soil volume that consists of water under field conditions. 484 407 891
Climate Water Soil water_Water table depth Depth of water table below soil surface at sampling time. 746 161 907
Soils Chemistry Soil Zn content Concentration of zinc in soil. 6 0 6
Taxonomy Taxonomy Species name unresolved "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. 326 2
Stand and vegetation characteristics Age Stand age Time since establishment of tree stand or plantation. 5233 1387 6620
Stand and vegetation characteristics Plant characteristics Stand canopy height Mean height of canopy at measurement site. 2530 567 3097
Stand and vegetation characteristics Stem characteristics Stand density_Stem number per ground area Proportion of sampling environment occupied by stems of a particular species of tree. 1056 934 1990
Stand and vegetation characteristics Stem characteristics Stand density_Stem number per species per ground area Number of stems per hectare of a specific species for a given stand of trees. 587 135 722
Stand and vegetation characteristics Aboveground biomass Stand fertilizer use efficiency (FUE) Amount of nitrogen acquired by the plants per unit nitrogen available. 20 0 20
Stand and vegetation characteristics Stem characteristics Stem diameter at breast height (DBH) Mean diameter of plant at breast height. 3219 679 3898
Stand and vegetation characteristics Stem characteristics Stem mass per plant Total mass of individual plant stem. 75 0 75
Study meta-data Data attribution Version_FRED version number FRED version number in which data in row first appeared. Version 0 is not acknowledged in version 1 and subsequent versions. 23633 11578 35211