金塔绿洲不同下垫面土壤热状况对比分析

CONTRAST ANALYSES OF THE SOIL HEAT CONDITION OF THE DIFFERENT GROUND SURFACE OVER JINTA OASIS

利用"绿洲系统能量与水分循环过程观测试验"2005年夏季补充观测资料,从地表反照率、土壤温度梯度、土壤热通量、土壤导热率等方面对比分析了绿洲、戈壁、沙漠的土壤热状况特征。结果表明:夏季晴天条件下,①戈壁、沙漠、绿洲的日平均反照率为0.230、0.212、0.196;②土壤温度梯度和地表净辐射有很好的线性关系,且通过0.01置信度检验;③5cm和20cm土壤热通量呈同位相变化;④戈壁、沙漠和绿洲5cm土壤导热率分别为0.193、0.317、0.374 W·(m·K)^(-1)。

The soil heat condition was analyzed at aspects such as surface albedo, soft temperature gradient, soil heat flux, thermal conductivity over Oasis, Gobi and Desert by using the data observed during the complementary observation period of the ＂Oasis System Energy and Water Cycle Field Experiment＂ （6.21-7.8 2005）. The results show that, at typical clear day in summer （1） the surface albedo of over Gobi, Desert and Oasis were calculated and the values are 0.230, 0.212,0. 196 respectively; （2）there was good linear correlation between soil temperature gradient and net surface radiation, and the correlation coefficient reached the testing of degree of 0.01 confidence;（3）soil heat flux at 5cm and 10cm beneath surface had the same variation tread; （4）the values of thermal conductivity over Gobi, Desert and Oasis were 0. 193,0.317,0.374 W· （m· K）^ - 1, respectively.