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《Journal of Soil and Water Conservation》 2017-04
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Effects of Soil Erosion on the Soil Organic Carbon of Typical Steep Under Different Grazing Intensities

LAN Ruijun;GUO Jianying;YIN Zhongdong;LI Jinrong;ZHANG Tiegang;College of Soil and Water Conservation,Beijing Forestry University;Institute of Water Resources for Pastoral Area,Ministry of Water Resources of China;  
Carbon storage and carbon loss were the serious issues in the soil erosion region of typical steppe.By field investigation and simulated rainfall,effects of grazing intensities on the soil erosion,soil organic carbon storage and carbon loss of typical steppe in Inner Mongolia were studied.The results showed that:(1)The grazing intensity had a great effect on the surface soil organic carbon,and the organic carbon storage increased firstly and then decreased,the ranking was the light grazingthe no grazingthe moderate grazingthe heavy grazing;the soil organic carbon storage in 0—40cm soil layer under different grazing intensity changed significantly and showed a vertical decreasing trend.(2)PFTs were most important,followed by N soil,and finally climate the soil erosion was mainly affected by rainfall intensity,followed by slope,and finally grazing intensity.(3)As for the same slope,the rainfall intensity had a greater influence on soil organic carbon loss than the grazing intensity;the soil erosion and soil organic carbon loss increased with the increasing rainfall intensity and grazing intensity.The findings indicate that it is necessary to control grazing intensity for soil erosion for soil erosion in typical steep.
【Key Words】: typical steppe simulated rainfall soil organic carbon soil erosion
【Fund】: 国家自然科学基金项目(41301302)
【CateGory Index】: S812.2
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