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Impact of soil texture and sweetpotato cropping system on soil erosion and nutrient loss in the Three Gorges Reservoir Area of the Changjiang River

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Journal of Life Sciences 2009年第5期3卷 30-35页

作者： LENG Jin-chuan FU Yu-fan YANG Chun-xian LIANG Yuan-yuan KONG Ling-ming LUO Yong DUAN Ji-wen LI Bao-chun ZHANG Qi-tang Key Laboratory on Ecology and Environment Three Gorges Reservoir Area of Ministry of Education/Sweetpotato Research Center of Chongqing College of Life Sciences Southwestern University Chongqing 400715 China Agriculture Extension Center of Yubei District of Chongqing Chongqing 401120 China Kentucky Tobacco Research and Development Center University of Kentucky KY 40546-0236 Lexington

This study investigated the impact of soil texture and sweetpotato cropping system on soil erosion and nutrient loss in the drought infield of the Three Gorges Reservoir Area of Changjiang River under field conditions. A factorial experiment was conducted in the study using five soil textures and two cropping systems. The lost soil during the crop season was recovered by a soil-blocking device and the dry weights for the total lost soil and its nutrient components, such as ammonium nitrogen, effective phosphorus, K^＋ and organic matter were analyzed. We found that soil texture significantly affected the dry weights of the total lost soil, effective phosphorus, K^＋, and organic matter, while sweetpotato cropping systems and interaction between soil texture and sweetpotato cropping system affected the dry weights of the total lost soil, the effective phosphorus and organic matter. Among the five soil textures tested, Da and Huang caused significantly less soil erosion and nutrient loss compared with the other three soil textures; intercropping sweetpotato with corn significantly reduced soil erosion and nutrient loss.

关键词： Three Gorges Reservoir Area of Changiiang River soil texture cropping systems: sweetpotato drought infield soil erosion nutrient loss

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