Key evidence of the role of desertification in protecting the underlying permafrost in the Qinghai-Tibet Plateau

被引:28
作者
Xie, Shengbo [1 ]
Qu, Jianjun [1 ]
Lai, Yuanming [1 ]
Xu, Xiangtian [2 ]
Pang, Yingjun [3 ]
机构
[1] Chinese Acad Sci, Cold & Arid Reg Environm & Engn Res Inst, State Key Lab Frozen Soil Engn, Dunhuang Gobi & Desert Res Stn,Key Lab Desert & D, Lanzhou 730000, Peoples R China
[2] Inner Mongolia Univ, Inst Transportat, Hohhot 010070, Peoples R China
[3] Chinese Acad Forestry, Inst Desertificat Studies, Beijing 100091, Peoples R China
基金
中国博士后科学基金; 中国国家自然科学基金;
关键词
GROUND SURFACE; SOIL; TEMPERATURE; CLIMATE; ECOSYSTEM; IMPACTS;
D O I
10.1038/srep15152
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Previous research has shown that the temperature of underlying permafrost decreases after the ground surface is covered with sand. No significant conclusions have yet been drawn that explain why this happens, because the heat transfer mechanism effects of the sand layer on the underlying permafrost remain unclear. These mechanisms were studied in the present work. We found that the upward shortwave radiation flux of the Qinghai-Tibet Plateau ground surface with a sand layer covering was higher than that of the surface without sand; thus, the atmospheric heat reflected by the sand layer is greater than that reflected by the surface without sand. Therefore, the net radiation of the surface with the sand layer is lower than that of the surface without sand, which reduces the heat available to warm the sand layer. Because sand is both a porous medium and a weak pervious conductor with poor heat conductivity, less heat is conducted through the sand layer to the underground permafrost than in soil without the sand deposition layer. This phenomenon results in a decrease in the ground temperature of the permafrost under the sand layer, which plays a key role in protecting the permafrost.
引用
收藏
页数:8
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