【摘要】 土壤热导率是重要的土壤热参数之一,在下垫面土壤热量的传输中起到重要作用;同时也是区域气候模式、陆面过程模式中重要的输入参数,在预估未来气候变化等方面也具有重要作用.根据国内外的研究现状,评述了土壤热导率的影响因素和模拟方案.其中,土壤质地、温度、含水(冰)量和孔隙度等是影响土壤热导率的主要因素,特别在研究冻土时需重点分析含冰量的变化.结合影响因素,比较分析了典型的国内外计算土壤热导率的模型,得出这些模型多适用于模拟常温下的热导率,低温条件如青藏高原冻土区模拟结果并不理想.因此,多年冻土区土壤热导率的研究多基于观测资料计算或使用陆面模式中的参数化方案估算,但因多年冻土内部水热传输过程的复杂性,青藏高原多年冻土区热导率的模型模拟仍需进一步研究.更多还原

【Abstract】 Soil thermal conductivity plays an important role in the transmission of surface soil heat into underlying soil,and also is a key parameter in the regional climate model or land surface model. In this paper,an overviewof advances on soil thermal conductivity is tried to provide,and its impact factors and schemes are introduced. The thermal conductivity is significantly affected by soil texture,temperature,moisture and soil porosity,and what’ s more,the research of frozen soil needs to focus on the change of ice content. Then the parametric processes and the advantages and disadvantages of various models are also analyzed. However,these schemes are mostly used in simulating thermal conductivity under normal temperature,which are difficult to be applied in research of frozen soils in the Tibetan Plateau. For researching the frozen soils in the plateau,observation data or parameterized scheme of the land surface model is necessary. Due to the impact of soil freezing and thawing cycles,the thermal conductivity in the plateau still needs to be further studied.更多还原