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针对黄土丘陵沟壑区水土流失严重以及作物产量低而不稳的特点 ,首先介绍了近 10年来王家沟流域作物生产变化的情况 ,然后在地理信息系统 (GIS)技术支持下 ,利用基于土壤侵蚀的 YIEL D作物生产力模型并结合各作物的实际观测资料 ,从气象因素 (降雨量、气温 )以及耕作措施两方面分析了该小流域作物生产力变化的原因 ,结果表明在气象因素 (大气降水 )和土壤侵蚀的共同影响下 ,土壤水分和养分的变化是影响该区作物生产力变化的主要因素
Aiming at the serious soil erosion and low and unsteady crop yield in the hilly and gully regions of the Loess Plateau, this paper first introduced the changes of crop production in the Wangjiagou watershed in the past 10 years. Then, with the support of Geographic Information System (GIS) technology, YIEL D Crop productivity model and the actual observation data of each crop were used to analyze the reasons of crop productivity changes in the small watershed from two aspects of meteorological factors (rainfall, temperature) and tillage measures. The results show that in the meantime, Under the common influence of erosion, the changes of soil moisture and nutrients are the main factors affecting the crop productivity in this area