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收稿日期:2010-7-22;改回日期:2010-8-16。
基金项目:国家自然科学基金项目(41001298,40901098)
作者简介:陈军(1975- ),男,工程师,陕西米脂县人,主要从事园林规划设计研究工作。E-mail:chen750202jun@163.com