生态学杂志2011，Vol.30Issue(8)：1703-1711,9.
京津水源区小流域土壤侵蚀空间模拟
Soil erosion in a small watershed in water source areas of Beijing and Tianjin:Spatial simulation
摘要
Abstract
Aiming at the fragile ecological environment and the strong spatial variability and unpredictable occurrence of soil and water loss in the water source areas of Beijing and Tianjin, a case study was conducted on the soil erosion pattern and its modulus in the Dongbeigou watershed in Pingquan County of Hebei Province by using geographic information system ( GIS) and Chinese Soil Loss Equation ( CSLE) , and the simulation precision of the CSLE was tested. The CSLE had a coefficient of determination higher than 0. 85 , being highly credible, and the watershed had a soil erosion modulus 2359. 24 t · km-2 · a-1, belonging to light degree erosion. 92. 1％ of the total soil loss came from the areas with a slope ＞15°. The soil erosion modulus increased gradually with slope, but showed a decreasing trend when the slope was ＞45°. A highly spatial heterogeneity was observed in the soil erosion modulus, being the highest (6112. 90 t · km-2 · a-1) for sloping cropland. Degraded grassland occupied 33. 2％ of the total area, but its soil erosion amount accounted for 74. 9％ of the total. 59. 3％ of soil erosion was from sunny and half-sunny slopes, and only 16.2％ of it came from shady and half-shady slopes. This study provided a technical basis for applying CSLE to assess the soil erosion in the water source areas of Beijing and Tianjin, and offered scientific reference for the soil and water conservation in the region.关键词
土壤侵蚀规律/地理信息系统(GIS)/中国水土流失模型(CSLE)/空间模拟Key words
soil erosion pattern/ geographic information system ( GIS) / China Soil Loss Equation ( CSLE) / spatial simulation.分类
农业科技引用本文复制引用
江青龙,谢永生,张应龙,张怀,郝晓东..京津水源区小流域土壤侵蚀空间模拟[J].生态学杂志,2011,30(8):1703-1711,9.基金项目
中国科学院知识创新重大项目(KSCX-YW-09-02,KSCX-YW-09-07)、水利部公益性行业科研专项经费项目(200901051,201001036)和国家科技支撑计划项目(2011BAD31B01)资助. （KSCX-YW-09-02,KSCX-YW-09-07）
