数据资源: 中文期刊论文

黄土高原作物产量及水土流失地形分异模拟(英文)



编号 zgly0001585980

文献类型 期刊论文

文献题名 黄土高原作物产量及水土流失地形分异模拟(英文)

作者 徐勇  杨波  刘国彬  刘普灵 

作者单位 InstituteofGeographicSciencesandNaturalResourcesResearch  CAS  InstituteofSoilandWaterConservation  CAS 

母体文献 Journal of Geographical Sciences 

年卷期 2009年03期

年份 2009 

分类号 S157 

关键词 cropyield  soilandwaterloss  topographicdifferentiation  LoessPlateau 

文摘内容 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 mete-orological 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 25° in comparison to the case of 0°.In addition,yields of soya,bean and potato decrease slightly by 5.26%,4.67% and 3.84%,respectively.The in-fluences 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°.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 5° and 15° 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 5° could remain unchanged,and the slope farm-land more than 15° should be defarmed as early as possible.

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