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收稿日期:2006-10-19
基金项目:国家重大基础预研项目(2005CCA05300);西北农林科技大学“青年学术骨干人才”基金支持
作者简介:刘志超(1978- ),男,河北唐山人,在读硕士,主要从事旱区农业资源管理研究。
通讯作者:杨改河(1957- ),男,陕西耀县人,教授,博士生导师,主要从事资源与环境生态研究与教学。