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Parameterizing soil organic carbon's impacts on soil porosity and thermal parameters for Eastern Tibet grasslands

查看全文 作　　者：CHEN [1]YingYing;YANG [1]Kun;TANG [1,2]WenJun;QIN [1]Jun;ZHAO [1,2]Long 高影响力作者 机构地区：[1]Key Laboratory of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau Research Chinese Academy of Sciences, Beijing 100085, China;[2]Graduate University of Chinese Academy of Sciences, Beijing 100049, China高影响力机构 出　　处：《Science China Earth Sciences》索引2012年第55卷第6期,共11页高影响力期刊 基　　金：supported by National Natural Science Foundation of China (Grant No. 41105003);Key Project of Chinese Academy of Sciences (Grant No.KZCX2-YW-Q10-2);National Natural Science Foundation of China (Grant No. 91025004);Open Fund from the State Key Laboratory of Remote Sensing Science (Grant No. OFSLRSS201108) that is cosponsored by the Institute of Remote Sensing Applications of Chinese Academy of Sciences and Beijing Normal University 摘　　要：This study investigates the stratification of soil thermal properties induced by soil organic carbon (SOC) and its impacts on the parameterization of the thermal properties. Soil parameters were measured for alpine grassland stations and North China flux stations, with a total of 34 stations and 77 soil profiles. Measured data indicate that the topsoils of alpine grasslands contain high SOC contents than underlying soil layers, which leads to higher soil porosity values and lower thermal conductivity and bulk density values in the topsoils. However, this stratification is not evident at the lowland stations due to low SOC contents. Evaluations against measured data show that three thermal conductivity schemes used in land surface models severely overestimate the values for soils with high SOC content (i.e. topsoils of alpine grassland), but they are better for soils with low SOC content. A new parameterization is then developed to take the impacts of SOC into account. The new one can well estimate the soil thermal conductivity values in both low and high SOC content cases, and therefore, it is a potential candidate of thermal conductivity scheme to be used in land surface models. 关 键 词：土壤孔隙度 土壤有机碳 高寒草原 热物性参数 西藏东部 有机碳含量 表面模型 性能参数
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