土壤溶解性有机碳(DOC)动态变化影响因素研究进展

Review of Researches on the Factors Influencing the Dynamics of Dissolved Organic Carbon in Soils

土壤溶解性有机碳(DOC)是陆生生态系统中极为活跃的有机组分,是土壤圈层与相关圈层(如生物圈、大气圈、水圈和岩石圈)发生物质交换的重要形式。与土壤有机碳其他组分相比,DOC对土壤质量变化、环境因素以及土地利用变化表现出高度敏感性,因此土壤DOC的消长动态及其影响因素已经成为了土壤、环境和生态科学领域研究的热点之一。本文对近年来有关土壤DOC动态变化影响因素的研究进行了综述,并分析了生物因素、非生物因素和人为因素对土壤DOC动态变化的影响及作用机理。研究表明,生物因素植被和土壤微生物控制着土壤DOC的输入和输出;非生物因素和人为因素通过作用于微生物活性、植被生长及其他过程而间接地驱动着土壤DOC的动态变化;生物因素、非生物因素和人为因素对土壤DOC的影响通常表现为综合作用。在此基础上,本文针对土壤DOC动态变化影响因素的进一步研究提出了两点建议,即应用模型定量分析各影响因素的作用和统一DOC含量的测定方法。

Dissolved organic carbon（DOC） is the extremely active organic component in terrestrial ecosystem, which plays an important role in the material exchange between pedosphere and others （such as, biosphere, atmosphere, hydrosphere and lithosphere）. Compared with the other components of soil organic carbon, DOC is highly sensitive to the changes of soil quality, environmental factors and land use types, so the dynamics and influencing factors of DOC in soils have become one of the hot spots in the fields of the soil, environmental and ecological sciences. In this paper, researches on the factors influencing the dynamics of DOC in soils were reviewed, and the influence mechanisms of factors including biological, non-biological and human factors were analyzed. The following conclusions were derived in this paper. Vegetations and microorganisms which belong to biological factors control the input and output of DOC in soils. Non-biological and human factors drive the dynamics of DOC by effecting the microbial activity, plant growth and other factors. Biological, non-biological and human factors are commonly showed comprehensive action. Based on that, this paper put forward two suggestions for the further researches on the factors influencing the dynamics of DOC in soils, namely, quantitative analysis on the influence intensity of factors by mathematical models and unifying the different methods to determine the content of DOC.