%0 Journal Article
%T On the Environmental Characterics and Changes in Northwestern Arid Area of China<br>论我国西北干旱区环境及其变迁的特殊性
%A Ma Ruijun
%A <br>马瑞俊
%J 环境科学
%D 1990
%I 
%X With a comparative approach, the author discusses theoretically the arid causes in the northwestetern area of China from the viewpoints of its formation course, space structure, heat and moisture conjunction, natural factors and human activities nn the environment as well.
%K 干旱区
%K 环境
%K 中国
%K 西北
%K 环境变迁
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=3FF3ABA7486768130C3FF830376F43B398E0C97F0FF2DD53&cid=A7CA601309F5FED03C078BCE383971DC&jid=64CD0AA99DD39F69401C615B85F123EF&aid=A4F0366D5E6B44CA1EB4C53A7AAF3850&yid=8D39DA2CB9F38FD0&vid=708DD6B15D2464E8&iid=0B39A22176CE99FB&sid=228A710F49B6CE58&eid=E203FB1A272C9DD2&journal_id=0250-3301&journal_name=环境科学&referenced_num=1&reference_num=5