Data Set Citation:
When using this data, please cite the data package:
NCEAS 2178: Jackson: Towards an explicit representation of root distributions in global models , National Center for Ecological Analysis and Synthesis , and Jackson R.
Global Distribution of Root Nutrient Concentrations in Terrestrial Ecosystems
nceas.198.3 (https://knb.ecoinformatics.org:443/knb/metacat/nceas.198.3/nceas)
General Information:
Title:Global Distribution of Root Nutrient Concentrations in Terrestrial Ecosystems
Identifier:nceas.198
Alternate Identifier:Root_nutrients_Appendix_A.txt; Root_nutrients_Appendix_B_References.txt (also in .pdf and .rtf formats)
Abstract:
Nutrient measurements for fine roots were compiled from 56 published studies providing information on 372 different combinations of species, root diameter, rooting depths, and soils at a variety of locations. The compilation was used to examine dynamics of 14 nutrients, including translocation properties of roots of varying size and status. Fine roots are an important source and sink for nutrients in terrestrial biogeochemistry. The data collected come from 56 published studies that give information on fine root (less than 5-mm diameter) nutrient concentrations, root diameters, and retranslocation of nutrients. These studies include diverse vegetation and biomes, including grass, shrub, and tree functional types from temperate, tropical, boreal and tundra systems. The preponderance of data comes from experiments with temperate and coniferous trees. Study sites were a mixture of natural and manipulated ecosystems, including old growth, secondary growth, old fields, and tundra systems. Data from fertilized, potted or greenhouse experiments were excluded. Data are available by diameter class. This listing builds on the database of Jackson et al (1996, 1997). Please see Gordon and Jackson (2000) for more information. The following hypotheses were examined (Gordon and Jackson 2000) for fine root nutrients by analyzing these data: (1) that there is an inverse relationship of fine root nutrient concentrations with root diameter, and (2) that retranslocation of nutrients out of fine roots is minimal. Nutrient concentrations of roots less than or equal to 5 mm in diameter were analyzed as a function of root diameter and root status (live, dead, and undifferentiated), including a comparison for coniferous and broad-leaved trees. From the results, mean N concentrations in live and dead fine roots were identical and may imply little retranslocation of root N with senescence, but conflicting evidence from C:N ratios highlights the need for further research (Gordon and Jackson 2000). These results have practical implications for various ecological methods and for the representation of roots in biogeochemical models. A PDF copy of the Gordon and Jackson (2000) paper is available at http://www.biology.duke.edu/jackson/Ecol99.htm. This data set builds on the initial root data compiled by R. B. Jackson in the mid-1990s (see Jackson et al. 1996; Jackson et al. 1997). The expanded and updated data set (Gordon and Jackson 2000) contains nutrient concentrations for approximately 372 site-pit-depths from 56 papers. In addition, the initial Jackson data set has been expanded for studies with root turnover rates (data for 341 site-vegetation combinations for approximately 188 sites from 152 papers in Gill and Jackson (2000) and rooting depth (data for approximately 298 sites with 565 profiles in Schenk and Jackson 2002). The three recent papers include most of the data contained in the initial root data set; however, some observations may have been excluded because of more stringent selection criteria. Many of the source papers provided data for the three recent rooting papers and users are encouraged to review all three data sets. The Oak Ridge National Laboratory Distributed Active Archive Center (ORNL DAAC) for Biogeochemistry Dynamics organized and formatted these data for long-term archive. The data and companion references were downloaded in html format from http://www.esapubs.org/archive/ecol/E081/002/default.htm. The HTML data file was converted to a tab-delimited text file with most all cells filled. Information and data that were not available in the source paper are represented as "N/A" or -999 for numeric columns. Cells containing "ND" indicate that the nutrient was not detected. An asterisk (*) in the Flag column indicates that some of the nutrient values were calculated from data presented in the respective paper.
Keywords:none:
  • global (place)
none:
  • root nutrients (theme)
none:
  • terrestrial ecosystems (place)

Involved Parties

Data Set Creators:
Organization:NCEAS 2178: Jackson: Towards an explicit representation of root distributions in global models
Organization:National Center for Ecological Analysis and Synthesis
Individual: Robert B. Jackson
Address:
Department of Botany University of Texas, Austin,
Austin, Texas 78713-7640 USA
Phone:
(512)471-5209 (voice)
Phone:
(512)471-3878 (Fax)
Email Address:
rjackson@mail.utexas.edu
Data Set Contacts:
Individual: Robert B. Jackson
Address:
Department of Botany University of Texas, Austin,
Austin, Texas 78713-7640 USA
Phone:
(512)471-5209 (voice)
Phone:
(512)471-3878 (Fax)
Email Address:
rjackson@mail.utexas.edu
Associated Parties:
Individual: W. S. Gordon
Metadata Providers:
Individual: Andrea Chadden

Data Set Characteristics

Geographic Region:
Geographic Description:Global. Biomes include: Agriculture Tropical grassland, Boreal forest, Coniferous forest, crop, Deciduous forest, Evergreen forest, Forest, Subtropical wet forest, Taiga, Temperate, Temperate coniferous forest, Temperate deciduous & coniferous, Temperate deciduous forest, Temperate grassland, Tropical deciduous forest, Tropical evergreen forest, Tropical forest, Tropical rain forest, Tropical savanna, and Tundra.
Bounding Coordinates:
West:  -127.829444444444  degrees
East:  148.9  degrees
North:  60.82  degrees
South:  -35.35  degrees
Time Period:
Begin:
1959-01-01
End:
1997-01-01

Sampling, Processing and Quality Control Methods

Data Set Usage Rights

no restrictions
Access Control:
Auth System:knb
Order:denyFirst
Metadata download: Ecological Metadata Language (EML) File