No protection of permafrost due to desertification on the Qinghai-Tibet Plateau.
No protection of permafrost due to desertification on the Qinghai-Tibet Plateau.
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DOI：
10.1038/s41598-017-01787-0
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发表时间：
2017-05-08
影响因子：
4.6
通讯作者：
Jin H
中科院分区：
文献类型：
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作者：
Wu Q;Yu W;Jin H
冻土带地区的荒漠化可能与永久冻土退化形成一个不断升级的循环，其中更多的永久冻土融化导致持续的荒漠化。这一传统观点在最近的报告中受到了挑战，报告称国家荒漠化保护了地下的永久冻土。如果将薄沙覆盖点的多年冻土温度（如Yu-7点，多年冻土温度为- 0.64℃，Yu-6点，多年冻土温度为- 1.15℃）与谢-1点的多年冻土温度（- 0.65℃，120 cm厚沙覆盖）进行比较，冻土温度没有显著差异。很明显，厚厚的沙层并不影响下面的永久冻土温度。我们的观察结果支持传统的地质学知识，即在大多数情况下，荒漠化不会保护永久冻土，而是会使其退化。
Desertification of tundra regions may form an escalating cycle with permafrost degradation where more permafrost thaw leads to continued desertification. This traditional viewpoint has been challenged in recent reports that state desertification protects the underlying permafrost. However, our measurements of soil temperature from nine sites in the Honglianghe River Basin, interior Qinghai-Tibet Plateau, show that desertification can degrade permafrost. If one compares the permafrost temperatures at sites with thin sand covers (e.g. site Yu-7, permafrost temperature of −0.64 °C; site Yu-6, permafrost temperature of −1.15 °C) with that of site Xie-1 (−0.65 °C, with a 120-cm-thick sand cover), the permafrost temperature is not significantly different. It is clear that a thick sand cover does not influence the underlying permafrost temperature. Our observations support traditional geocryological knowledge which states that, under most circumstances, desertification does not protect, but rather degrades, permafrost.