Based on investigation and monitoring data from 1985 to 2006 at Zhifanggou Catchment in Hilly-gully Region of the Loess Plateau and current research achievement,methods of principal components analysis(PCA) and path analysis(PA) were combined to analyze impact factors which affect change of agro-ecological security state,and driving forces of agro-ecological security change were discussed.The obtained results show that the basis of agro-ecological security change are natural conditions and its main driving ...
修改评论