The effect of climate warming and permafrost thaw on desertification in the Qinghai-Tibetan Plateau.
The effect of climate warming and permafrost thaw on desertification in the Qinghai-Tibetan Plateau.
复制标题
DOI：
10.1016/j.geomorph.2009.01.004
复制
发表时间：
2009-07
期刊：
影响因子：
3.9
通讯作者：
X. Xue;Jian Guo;Bangshuai Han;Qingwei Sun;Li-chao Liu
中科院分区：
文献类型：
--
作者：
X. Xue;Jian Guo;Bangshuai Han;Qingwei Sun;Li-chao Liu
结果表明：1980 ~ 2005年，该地区表层土壤温度以平均0.6°C / a的速率升高；1983 ~ 2001年，表层融化日数增加了60 d； 1983 ~ 2003年，4月、5月和6月季节融化层深度分别增加了54 cm、102 cm和77 cm。由于活性层的增厚和土壤水分的入渗，上层土壤变得更加干燥。这些变化反过来又抑制了根系较浅的高寒草甸植被的生长。
Four sets of remote sensing images from 1987, 1994, 2000, and 2006, 50 years of meteorological and soil moisture data corresponding to different desertified lands were combined with populations and livestock data to analyze the process and cause of desertification in a portion of the Qinghai–Tibetan Plateau (QTP). It showed that surface soil temperature in the region has increased at an average rate of 0.6 °C per decade between 1980 and 2005, the thawing days on the surface have increased by 60 days from 1983 to 2001, and the depth of the seasonal thawing layer has increased by 54 cm, 102 cm and 77 cm in April, May and June, respectively, from 1983 to 2003. As a result, the upper soil layer has become drier due to the thickening active layer and soil water infiltration. These changes, in turn, have inhibited the growth of alpine meadow vegetation that has shallow root systems. It is concluded that climate warming and permafrost thawing have caused desertification in grazing regions of the Qinghai–Tibetan Plateau (QTP).