作者单位:Ma Jianqin,Wei Rui(North China University of Water Conservancy and Electric Power, Zhengzhou 450011)马建琴,魏蕊(华北水利水电学院,郑州 450011)Xia Jun,Liu Xiaojie(Institute of Geographical Sciences and Natural Resources Research, CAS, Beijing 100101)夏军,刘晓洁(中国科学院地理科学与资源研究所 北京 100101)