中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
Topographic differentiation simulation of crop yield and soil and water loss on the Loess Plateau

文献类型:SCI/SSCI论文

作者Xu Y.; Xu Y.
发表日期2009
关键词crop yield soil and water loss topographic differentiation Loess Plateau china
英文摘要De-farming slope farmland has been an effective measure in recent years for the improvement of the eco-environment and the mitigation of soil and water loss on the Loess Plateau. This paper, taking the Yangou Basin as a case study and using day-by-day meteorological data of Yan'an station in 2005, simulated and analyzed the quantitative relation between crop yield, soil and water loss and topographic condition with the aid of WIN-YIELD software. Results show that: 1) topographic gradient has important influence on crop yield. The bigger gradient is, the lower the crop yield. Yields of sorghum and corn decrease by 15.44% and 14.32% respectively at 250 in comparison to the case of 0 degrees. In addition, yields of soya, bean and potato decrease slightly by 5.26%, 4.67% and 3.84%, respectively. The influences of topographic height and slope aspect on crop yield are slight. 2) Under the same topographic condition, different crops' runoff and soil loss show obvious disparity. Topographic gradient has important influence on soil and water loss. In general, the changing trend is that the soil and water loss aggregates with the increase of gradient, and the maximal amount occurs around 20 degrees. The influence of topographic height is slight. Topographic aspect has a certain effect, and the fundamental characteristic is that values are higher at the aspect of south than north. 3) Topographic gradients of 50 and 150 are two important thresholds. The characteristic about soil and water loss with the variation of topographic gradients show that: the slope farmland with gradient less than 50 could remain unchanged, and the slope farmland more than 150 should be de-farmed as early as possible.
出处Journal of Geographical Sciences
19
3
331-339
收录类别SCI
语种英语
ISSN号1009-637X
源URL[http://ir.igsnrr.ac.cn/handle/311030/22643]  
专题地理科学与资源研究所_历年回溯文献
推荐引用方式
GB/T 7714
Xu Y.,Xu Y.. Topographic differentiation simulation of crop yield and soil and water loss on the Loess Plateau. 2009.

入库方式: OAI收割

来源:地理科学与资源研究所

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