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cje ›› 2011, Vol. 30 ›› Issue (08): 1703-1711.

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Soil erosion in a small watershed in water source areas of Beijing and Tianjin: Spatial simulation.

JIANG Qing-long1, XIE Yong-sheng1,2**, ZHANG Ying-long1, ZHANG Huai3, HAO Xiao-dong3   

  1. 1College of Resources and Environment, Northwest A & F University, Yangling 712100, Shaanxi, China; 2Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling 712100, Shaanxi, China; 3Institute of Soil and Water Conservation of Chengde in Hebei Province, Chengde 067000, Hebei, China
  • Online:2011-08-08 Published:2011-08-08

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.

Key words: Veronica persica, Colletotrichum gloeosporioides f.sp. veronicae, Pathogenicity, Influential factors