%0 Journal Article
%T Effects of human engineering activities on permafrost active layer and its environment in northern Qinghai-Tibetan plateau<br>人类工程活动对青藏高原北部多年冻土融化层及其环境的影响
%A GUO Zhenggang
%A WU Qingbo
%A NIU Fujun
%A <br>郭正刚
%A 吴青柏
%A 牛富军
%J 应用生态学报
%D 2006
%I 
%X With disturbed and undisturbed belts during the construction of Qinghai-Tibet highway as test objectives, this paper studied the effects of human engineering activities on the permafrost ecosystem in northern Qinghai-Tibetan plateau. The results showed that the thickness of permafrost active layer was smaller in disturbed than in undisturbed belt, and decreased with increasing altitude in undisturbed belt while no definite pattern was observed in disturbed belt. Different vegetation types had different effects on the thickness of permafrost active layer, being decreased in the order of steppe>shrub>meadow. In the two belts, altitude was the main factor affecting the vertical distribution of soil moisture, but vegetation type was also an important affecting factor if the altitude was similar. Due to the human engineering activities, soil temperature in summer was lower in disturbed than in undisturbed belt.
%K Human engineering activity
%K permafrost active layer
%K Soil temperature
%K Soil moisture<br>人类工程活动
%K 融化层
%K 土壤温度
%K 土壤水分
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=90BA3D13E7F3BC869AC96FB3DA594E3FE34FBF7B8BC0E591&jid=42FEDDFE54F8BCD9D5FD1926ABDD7722&aid=895082CC49B9997C&yid=37904DC365DD7266&vid=BCA2697F357F2001&iid=708DD6B15D2464E8&sid=7B6F8FF0F7C4CB44&eid=EED5C98ED814B809&journal_id=1001-9332&journal_name=应用生态学报&referenced_num=0&reference_num=18