【摘要】 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更多还原

【Abstract】 Aiming at characteristics of serious soil erosion and low and unstable crop productivity,crop production of Wangjiagou watershed in recent ten years is presented, after that, under the support of geographic information system, utilized crop productivity model-YIELD model, combining actual observation data of crop, from two aspects of meteorologic factor (precipitation, temperature) and cultivation measure,reasons of agricultural production changing are analyzed,and the change of soil moisture and soil nutrient affected by precipitation and soil erosion is the main factor influencing crop productivity changing.更多还原