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基于青藏高原江河源区典型多年冻土和季节冻土区建立的不同植被盖度下7个地温和水分观测场,对多年冻土活动层和季节冻土土壤温度和水分对植被盖度的响应分为4个阶段进行分析和对比研究.结果表明:随着植被盖度的降低,多年冻土活动层冻结深度积分减少,而季节冻土冻结深度积分增加;多年冻土冻结期负值等温线和未冻结期正值等温线的最大侵入深度和持续时间随着植被盖度降低明显增加;多年冻土活动层20～60cm的土壤含水量随着植被盖度降低而减少,而60～80cm的土壤含水量反而增加,季节冻土土壤剖面0～120cm的水分含量随着植被盖度的降低而减少.植被盖度的变化改变了冻土水热过程,且多年冻土和季节冻土对植被盖度的响应不一致.
Based on the observation ground of seven geotemperature and moisture under different vegetation cover in the typical permafrost and seasonal frozen soil regions in the source regions of the Qinghai-Tibet Plateau, the responses of soil temperature and moisture to the vegetation cover of the active layer and the seasonal frozen soil in the permafrost The results show that with the decrease of vegetation coverage, the freezing depth integral of the active layer in permafrost decreases, while the integral integral of frozen depth increases in winter, while the negative isotherm of frozen soil in permafrost And the maximum intrusion depth and duration of the positive temperature isotherms with the decrease of vegetation coverage increased obviously. The soil moisture content of 20 ~ 60 cm in active layer of permafrost decreased with the decrease of vegetation coverage, while that of 60 ~ 80 cm The soil water content increased, and the moisture content in 0-120cm soil profile of seasonal frozen soil decreased with the decrease of vegetation coverage.The change of vegetation coverage changed the hydrothermal process of permafrost, and the influence of permafrost and seasonal frozen soil on vegetation Coverage of the response is inconsistent.