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为了研究青藏高原暖季土壤水分对冻土区地表热状况的影响,选取2010-2012年5-9月在青藏高原唐古拉气象场获取的气象及其活动层数据,分析了表层土壤水分对地表反照率以及土壤热参数的影响.结果表明:唐古拉站暖季表层土壤含水量集中在0.15~0.27之间,地表反照率值集中在0.14~0.24之间,日平均土壤热导率的波动范围在0.9~2.0 W·m~(-1)·K~(-1)之间,土壤热容的波动范围主要集中在0.8×10~6~1.8×10~6J·m~(-3)·K~(-1)之间,而土壤热扩散率则主要集中在0.6×10~(-6)~2.2×10~(-6)m~2·s~(-1)之间.土壤水分对地表反照率影响较大,随着土壤水分的增长,地表反照率呈现出明显的减小趋势.土壤水分对地表反照率的影响还受到植被生长周期的影响,土壤水分和地表反照率之间的关系在植被枯萎期和生长期有明显的差异性.唐古拉地区土壤热参数也明显受到土壤水分变化的影响,随着土壤水分的增加,土壤热导率、热容和热扩散率都为增大趋势,但是土壤水分对土壤热导率的影响较为显著,而对土壤热扩散率的影响则不显著.
In order to study the influence of soil moisture in the warm season on the surface thermal condition in the permafrost region, this paper selects the meteorological data and active layer data acquired from Tanggula Meteorological Station of the Tibetan Plateau from May to September in 2010-2012 and analyzes the effects of surface soil moisture on the surface albedo The results showed that the surface soil moisture of Tanggula station concentrated in the interval of 0.15-0.27, the surface albedo value concentrated in the range of 0.14-0.24, and the daily average soil thermal conductivity fluctuated in the range of 0.9 The fluctuation range of soil heat capacity mainly lies in the range of 0.8 × 10 ~ 6 ~ 1.8 × 10 ~ 6J · m ~ (-3) · K ~ (-1) (-1), while the soil thermal diffusivities are mainly concentrated in the range of 0.6 × 10 -6 ~ 2.2 × 10 -6 m -2 · s -1 The effects of soil moisture on the surface The albedo has a great influence on it, and the surface albedo shows a decreasing trend with the increase of soil moisture.The influence of soil moisture on the surface albedo is also affected by the vegetation growth cycle, the relationship between soil moisture and surface albedo There was obvious difference in withering period and growing period of vegetation.The soil thermal parameters of Tangula were also obviously affected by soil moisture change.With the increase of soil moisture , Soil thermal conductivity, heat capacity and thermal diffusivity all tended to increase. However, the effect of soil moisture on soil thermal conductivity was significant, but the effect on soil thermal diffusivity was insignificant.