Soil nitrous oxide emissions from global specialty crop systems
Abstract
The data were extracted from published studies. All references and data sources are listed.
We conducted an exhaustive literature search using Google Scholar and Web of Science databases. The searched keywords were ‘soil nitrous oxide emission’, ‘soil greenhouse gas emission’, and ‘soil trace gas emission’ respectively combined with each specialty crop. We searched for the common specialty crops listed by USDA, including fruits, tree nuts, and vegetables (https://www.ams.usda.gov/services/grants/scbgp/specialty-crop). The most recent search was in November 2023. For each article returned by the search, we evaluated whether it reported field observations of annual cumulative N2O emissions. Laboratory and greenhouse studies were excluded. This process identified 1137 observations from 114 studies. These studies covered six continents and four main climate types (Köppen climate classification). Area-scaled N2O emissions were reported as annual cumulative emissions (kg N2O-N ha−1 year−1). Yield-scaled N2O emissions were calculated by dividing area-scaled N2O emissions by fresh weight yield (kg N2O-N Mg fresh yield−1). The emission factor (EF) for annual cumulative N2O emission was calculated by EF (%) = (EN − E0)/Nrate. The EN and E0 are the N2O emissions (kg N2O-N ha−1 year−1) with and without N fertilizer, respectively. The Nrate is the N fertilizer application rate (kg N ha−1 year−1). Soil properties and environmental factors were also listed if they were avalable. Empty cells in the datasheet indicate no data avalable for that category or variable.
README: Soil nitrous oxide emissions from global specialty crop systems
https://doi.org/10.5061/dryad.tht76hf5z
Soil nitrous oxide emissions from global specialty crop systems were collected, with 1137 observations from 114 published studies.
Description of the data and file structure
Area-scaled N2O emissions were reported as annual cumulative emissions (kg N2O-N ha−1 year−1). Yield-scaled N2O emissions were calculated by dividing area-scaled N2O emissions by fresh weight yield (kg N2O-N Mg fresh yield−1). The emission factor (EF) for annual cumulative N2O emission was calculated by EF (%) = (EN − E0)/Nrate. The EN and E0 are the N2O emissions (kg N2O-N ha−1 year−1) with and without N fertilizer, respectively. The Nrate is the N fertilizer application rate (kg N ha−1 year−1). Fertilizer rate was reported as annual application rate (kg N ha−1 year−1). The other agricultural management practices, e.g., irrigation, tillage, cover crop, biochar, were also reported if they were available in the published studies. Climatic factors, e.g., climate type, mean annual temperature, mean annual precipitation, were reported. Soil properties, e.g., soil organic carbon (SOC), soil pH, soil texture, were reported. References and data sources were listed. Empty cells in the datasheet indicate no data available for that category.
Variables and Definitions |
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Counts, total number of observations |
Annual cumulative N2O-N (kg ha−1 year−1), soil N2O emissions per year |
Annual crop yield (fresh weight Mg ha−1 year−1), crop yield per year |
Yield-scaled N2O-N (kg N Mg yield−1), Annual cumulative N2O-N divided Annual crop yield |
Fertilizer rate kg N ha−1 year−1, nitrogen fertilizer application rate per year |
Emission factor (%), N2O emission factor |
Fertilizer type, organic, inorganic, or organic+inorganic |
Nitrification inhibitor, yes or no |
Fertigation, yes or no |
Irrigation rate, full or deficit irrigation |
Irrigation type, drip irrigation or other |
Rotation number per year, 1-3 rotations per year |
Tillage, conventional or reduced tillage |
Cover crop, legume, non-legume, or no cover crop |
Biochar, yes or no |
Köppen-Geiger climate classification, climate type of the study location |
Mean annual temperature (°C), Mean annual temperature of the study location |
Mean annual precipitation (mm), Mean annual precipitation of the study location |
Water regime, rainfed or irrigated |
SOC (%), soil organic carbon concentration |
Soil texture, coarse, medium, or fine |
Soil pH, the pH value of the soil |
Crop type, annual or perennial |
Crop, the specific crop in the study field |
Latitude, latitude of the study location |
Longitude, Longitude of the study location |
Site, study location |
Continent, study location |
Reference, data source |
Sharing/Access information
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Code/Software
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