青藏高原北部不同下垫面土壤热力特性研究  

STUDY ON SOIL THERMODYNAMIC CHARACTERISTICS AT DIFFERENT UNDERLYING SURFACE IN NORTHERN QINGHAI-TIBETAN PLATEAU

作　　者：李韧[1,2,3] 赵林[1,2,3] 丁永建[1,3] 吴通华[1,2,3] 肖瑶[1,2,3] 杜二计[1,2,3] 刘广岳[1,2,3] 孙琳婵[1,2,3] 刘杨[1,2,3] 

机构地区：[1]中国科学院青藏高原冰冻圈观测研究站,兰州730000 [2]冰冻圈科学国家重点实验室,兰州730000 [3]中国科学院寒区旱区环境与工程研究所,兰州730000

出　　处：《太阳能学报》2013年第6期1076-1084,共9页Acta Energiae Solaris Sinica

基　　金：国家自然科学基金(40871037);国家自然科学基金重点项目(40830533);国家自然科学青年基金(40901042);国家自然科学基金(41071143);国家重点基础研究发展(973)计划(2007CB411504;2007CB411505);冰冻圈与全球变化重点实验室自主课题(SKLCS-ZZ-2010-03);科技部基础调查项目(2008FY110200);中国科学院青藏高原冰冻圈观测研究站

摘　　要：利用2003年10月～2004年9月青藏高原北部可可西里（QT01）、北簏河（QT02）、开心岭（QT05）、通天河（QT06）等地区一个完整的冻融循环周期活动层土壤热通量、土壤温度、土壤水分等观测资料，通过数值方法汁钎：高原北部活动层土壤导热率，分析高原北部活动层表层土壤热通量及导热率的变化特征。结果靠示，研究区域活动层土壤导热率具有明显的季节变化特点，表现为冷季小、暖季大；导热率随土壤容重的增火而增人，随下垫面植被盖度的增大而减小，高寒草甸土的上壤导热率小于高寒草原土的导热率；细粒土壤、较小未冻水含艟7支较低的饱和度是造成冷季士壤导热率较小的原冈；月平均导热率叮表永为地气温差及水气压等常规气象资料的函数。Using the data of soil temperature gradient, soil moisture and soil heat flux from Oct. 2003 to Sep. 2004, soil thermal conductivity at the topsoil of active layer in northern Qinghai-Tibetan Plateau were calculated by numerical method. And the features of topsoil＇ s heat flux and thermal conductivity were analyzed. The results show that the soil thermal conductivity reveals obvious seasonal variation characteristics with small values in cold season while lager values in warm season. Thermal conductivity increases with the increase of soil bulk density, while deceases with the decrease of underlying surface vegetation coverage. For different underlying soil type, thermal conductivity of alpine steppe is greater than that of alpine meadow. Low thermal conductivity in cold season is attributed to fine-grained soil, the smaller unfrozen water content and lower degree of saturation. Monthly average thermal conductivity can be expressed as the function of the temperature difference of surface and air and the water pressure.

关 键 词：青藏高原 下垫面 活动层 导热率 

分 类 号：TK512[动力工程及工程热物理—热能工程]