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Spatial Extent: |
China |
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Spatial Resolution: |
County |
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Temporal Characteristics: |
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Date Classes Represented: |
Time-Series, Reference |
Time Steps Available: |
annual |
Dates represented: |
1990 |
Acknowledge the University of New Hampshire, EOS-WEBSTER Earth Science Information Partner (ESIP) as the data distributor when using the data in subsequent models or publications.
Summary:
The agricultural and geographic datasets included on the China County Data collection were compiled in the early 1990s for use as inputs to the DNDC (Denitrification-Decomposition) model at UNH. DNDC is a computer simulation model for predicting carbon (C) and nitrogen (N) biogeochemistry in agricultural ecosystems. The datasets were compiled from multiple Chinese sources and all are at the county scale for 1990.
The tables below list the variables, variable descriptions, units and sources for each of the datasets in the China County Data collection.
Available Data Sets:
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Variables
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Variable Description
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Units
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| Irrigation Index | Fraction of cropland under irrigation (excluding rice paddies) | fraction |
| Nitrogen Fertilizer | Nitrogen fertilizer applied | tonne N/county/year |
Agricultural Management References:
Research Center for Eco-Environmental Sciences of Chinese Academy of Sciences, Eco-Environmental Database of China (unpublished).
Zui, D.C., H.S. Liu, J.R. Min, and J.M. He, 1984. Atlas of Climatic Resources for Major Crops in China (1:17,000,000). Meteorological Press; Beijing (in Chinese).
Bi, Y.Y (Ed.), 1995. Farmland in China. Agricultural Science and Technology Press, Beijing, 231 pp (in Chinese).
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Crop Variables
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Variable Description
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Units
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| Cereal | Area sown to other cereal grains | hectares |
| Corn | Area sown to corn (maize) | hectares |
| Cotton | Area sown to cotton | hectares |
| Double Season Rice | Area sown to a double rice rotation | hectares |
| Green Manure | Area sown to green manure (plant matter returned to the soil to increase the soil organic content) | hectares |
| Potatoes | Area sown to potatoes | hectares |
| Rapeseed | Area sown to rape oilseed | hectares |
| Rice and Rapeseed | Area sown to rice/rape oilseed rotation | hectares |
| Single Season Rice | Area sown to a single rice rotation | hectares |
| Spring Wheat | Area sown to spring wheat | hectares |
| Sorghum | Area sown to sorghum | hectares |
| Soybeans | Area sown to soybeans | hectares |
| Sugarbeets | Area sown to sugarbeets | hectares |
| Sugarcane | Area sown to sugarcane | hectares |
| Tobacco | Area sown to tobacco | hectares |
| Vegetables | Area sown to vegetables | hectares |
| Winter Wheat | Area sown to winter wheat | hectares |
| Winter Wheat and Corn | Area sown to winter wheat/corn rotation | hectares |
| Winter Wheat and Rice | Area sown to winter wheat/rice rotation | hectares |
Crop Statistics Sources:
Research Center for Eco-Environmental Sciences of Chinese Academy of Sciences; Eco-Environmental Database of China (unpublished).
Zui D.C.et al. 1984. Atlas of Climatic Resources for Major Crops in China (1:17 000 000). Meteorological Press; Beijing (in Chinese).
Bi Y.Y (Ed.) 1995. Farmland in China. Agricultural Science and Technology Press Beijing 231 pp (in Chinese).
N-Deposition:
N-deposition is wet plus dry deposition of NOy (=NOx+HNO2+HNO3+HO2NO2+NO3+N2O5+PAN) and NHx. The values were derived from two analyses of global N-deposition. We used the Moguntia model (Dentener & Crutzen, 1994) estimates of NOy and NOy + NHx for mainland China at 10° x 10° resolution to generate a mean NHx:(NOy + NHx) ratio of 0.632. We then applied this to the higher resolution GCTM model (Levy & Moxim, 1989) of NOy deposition (total N = 2.717 * NOy) to generate a 2.4° x 2.4° map of total N-deposition (kg N/km2) for China. County values were calculated by a bilinear interpolation to the county centroid from the 2.4° x 2.4° grid. N-deposition values were then converted to mg N/liter precipitation (or ppm) based on the county annual precipitation.
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Variable
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Variable Description
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Units
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| Nitrogen Deposition | Nitrogen deposition rate | mg N/liter |
N-Deposition References:
Levy, H. and W.J. Moxim (1989) Simulated global distribution and deposition of reactive nitrogen emitted by fossil fuel combustion. Tellus B41, 256-271.
Dentener, F.J. and P.J. Crutzen (1994) A three-dimensional model of the global ammonia cycle. J. Atmos. Chem. 19, 331-369.
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Variables
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Variable Description
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Units
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| County Area | Total county area | hectares |
| Latitude and Longitude | Lat. and long. of centroid of the county | decimal degrees |
| Population | Human population |
Geography and Population Statistics Sources:
County Area: Center for International Earth Science Information Network (CIESIN) at Columbia University.
Latitude and Longitude: Center for International Earth Science Information Network (CIESIN) at Columbia University.
Population: Research Center for Eco-Environmental Science (RCEES), Beijing
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Land Use Variables
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Variable Description
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Units
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| Cropland | Land area used for crops | hectares |
| Sown | Area planted; double cropped fields are double counted | hectares |
Land Use Statistics References:
Research Center for Eco-Environmental Sciences of Chinese Academy of Sciences, Eco-Environmental Database of China (unpublished).
Zui, D.C., H.S. Liu, J.R. Min, and J.M. He, 1984. Atlas of Climatic Resources for Major Crops in China (1:17,000,000). Meteorological Press; Beijing (in Chinese).
Bi, Y.Y (Ed.), 1995. Farmland in China. Agricultural Science and Technology Press, Beijing, 231 pp (in Chinese).
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Livestock Variables
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Variable Description
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Units
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| Cattle | Census of cattle | head |
| Hogs | Census of swine | head |
| Horses | Census of horses, donkeys and camels | head |
| Sheep | Census of sheep and goats | head |
Livestock Statistics Source:
Research Center for Eco-Environmental Sciences of Chinese Academy of Sciences, Eco-Environmental Database of China (unpublished).
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Soil Properties Variables
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Variable Description
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Units
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| Bulk Density (high) | Soil bulk density; county high value | g/cm3 |
| Bulk Density (low) | Soil bulk density; county low value | g/cm3 |
| Clay (high) | Clay content of soil; county high value | fraction |
| Clay (low) | Clay content of soil; county low value | fraction |
| Organic Carbon (high) | Organic carbon content of soil; county high value | kg C/kg soil |
| Organic Carbon (low) | Organic carbon content of soil; county low value | kg C/kg soil |
| Soil pH (high) | pH of soil; county high value | |
| Soil pH (low) | pH of soil; county low value |
Soil Properties References:
Institute of Soil Science of Chinese Academy of Sciences, The Soil Atlas of China (1:14,000,000), Cartographic Publishing House, Beijing, China, 1986.
National Soil Survey Office of China, Soils in China, Vol. 1-6, Agricultural Publishing House, Beijing, China, 1993-97 (in Chinese)
Data Providers:
Changsheng Li and Steve Frolking, Complex Systems Research Center, Institute for the Study of Earth, Oceans, and Space, Morse Hall, University of New Hampshire, Durham, New Hampshire, USA. Ph: 603.862.1792, Fax: 603.862.0188, Email: steve.frolking@unh.edu.
Last Data Update:
2/28/2000
Last Doc. Updated:
10/10/2001
Doc. Updated By:
Denise Blaha
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