Data Set Citation:
When using this data, please cite the data package:
NCEAS 3880 : Luo: NitrogenAndCO2 , Luo Y , Zhang D , Hui D , and National Center for Ecological Analysis and Synthesis.
Elevated CO2 stimulates net accumulations of carbon and nitrogen in land ecosystems: a meta-analysis database
bowdish.233.36 (https://knb.ecoinformatics.org:443/knb/metacat/bowdish.233.36/nceas)
General Information:
Title:Elevated CO2 stimulates net accumulations of carbon and nitrogen in land ecosystems: a meta-analysis database
Identifier:bowdish.233.36
Abstract:
We compiled data from 104 published papers that study C and N dynamics at ambient and elevated CO2. The compiled database contains C contents, N contents, and C:N ratio in various plant and soil pools, and root:shoot ratio. Averaged C and N pool sizes in plant and soil all significantly increase at elevated CO2 in comparison to those at ambient CO2; ranging from a 5% increase in shoot N content to a 32% increase in root C content. Parts of this data set are copyrighted by the Ecological Society of America. Luo, Yiqi, Dafeng Hui, and Deqiang Zhang. 2006. Elevated CO2 stimulates net accumulations of carbon and nitrogen in land ecosystems: a meta-analysis. Ecology 87:53-63. Ecological Archives E087-001
Keywords:
  • carbon sequestration
  • ecosystem development
  • global change
  • meta-analysis
  • nitrogen
  • stiochiometry
Data Table, Image, and Other Data Details:
Metadata download: Ecological Metadata Language (EML) File
Data Table:Database for Elevated CO2 paper - All ( View Metadata | Download File download)
Data Table:ReferencesForMetaAnalysis.txt ( View Metadata | Download File download)
Data Table:Database for Elevated CO2 paper, Area-based ( View Metadata | Download File download)
Data Table:Database for Elevated CO2 paper, Plant-based ( View Metadata | Download File download)
Data Table:Excel File - Database for Elevated CO2 paper ( View Metadata | Download File download)

Involved Parties

Data Set Creators:
Organization:NCEAS 3880 : Luo: NitrogenAndCO2
Individual: Yiqi Luo
Organization:University of Oklahoma
Email Address:
yluo@ou.edu
Individual: Deqiang Zhang
Organization:Division of Restoration Ecology, South China Botanical Garden
Address:
Guangzhou 510650,
China
Phone:
+86 (0)20 37252615 (voice)
Email Address:
zhangdeq@scbg.ac.cn
Individual: Dafeng Hui
Organization:Department of Biology Duke University
Email Address:
dafeng@duke.edu
Organization:National Center for Ecological Analysis and Synthesis
Data Set Contacts:
Individual: Yiqi Luo
Organization:University of Oklahoma
Email Address:
yluo@ou.edu

Data Set Characteristics

Sampling, Processing and Quality Control Methods

Step by Step Procedures
Step 1:  
Description:
This method description is taken from the Ecological Society of America paper mentioned in the abstract.

Data sources

The constructed database consists of 940 lines of entries, each containing sources of data, experimental facilities, ecosystem types, field sites, exposure times, nitrogen treatments, CO2 concentrations of treatments, and 18 variables (see Appendix B). Experimental facilities are divided into free-air CO2 Enrichment (FACE), open-top chamber (OTC), and growth chamber (GC). Studies with plants grown in pots in greenhouses and growth chambers are lumped together into the category of GC. Ecosystem types include forest, grassland, wetland, cropland, and desert. Exposure times are the durations from the start of experiments to the time when data are collected and are in unit of year. Any exposure times that are less than one year are approximated by one year. Regardless of experimental duration, the exposure time is one year for annual crops if plant biomass is analyzed. Nitrogen treatments are only qualitatively divided into low and high. If there are more than two levels of N treatments, the lowest and highest treatments are included into the database. Treatments of other factors (e.g., temperature, O3, and species compositions) are not explicitly analyzed, but data at all the treatments are included in the meta-analysis.

Sampling Area And Frequency:
The 18 variables collected from papers describe biomass in aboveground shoot, belowground root, and whole plant; C pools in shoot, root, whole plant, litter, and soil; N pools in shoot, root, whole plant, litter, and soil; ratios of C and N in shoot, root, litter, and soil pools; and root:shoot ratio. For each of the 18 variables, we extracted means, standard errors, and sample sizes.
Sampling Description:
The database is divided into area-based and plant-based data. The plant-based data are mostly from GC studies with units of C and N per plant while the area-based data are mostly from FACE and OTC studies. Data of C and N pools from the FACE and OTC studies are expressed in, or converted to if the original data were presented otherwise, units of g C/m²and g N/m² ground area, respectively. If pretreatment data are available and substantial differences exist between treatment plots, observed values are corrected with the differences before calculating treatment effects. The corrections are usually done with simple addition and subtraction unless additional information is available for linear model corrections. (e.g., Lichter et al. 2005)

Data Set Usage Rights

Access Control:
Auth System:knb
Order:denyFirst
Metadata download: Ecological Metadata Language (EML) File