侵蚀背景下湘中红壤丘陵区土地利用方式对土壤活性有机碳分布特征的影响研究

以红壤丘陵区典型区域为对象,采用野外调查与室内分析相结合的方法,研究了侵蚀背景下红壤丘陵区不同土地利用方式对土壤活性有机碳的影响规律.结果表明,1)土地利用方式影响土壤活性有机碳主要体现在表层土壤.不同土地利用方式下表层土壤活性有机碳含量差异显著,而在表层以下的土壤中没有显著性差异;2)土地利用方式对不同侵蚀部位活性有机碳影响较大.不同土地利用方式下侵蚀部位土壤活性有机碳含量差异性明显高于沉积部位;3)不同土地利用方式之间活性有机碳的垂向分布规律基本一致,表现为表层活性有机碳含量最高,随着土层深度的增加,含量逐渐减小.

Effect of Land Use Type of Red Soil Hilly Region on Distribution of Soil Labile Organic Carbon Properties under the Condition of Soil Erosion

Soil erosion is one of the major environmental problems affecting people's survival, and the exploration of the effect of land use type on soil labile organic carbon is of significance to regional soil environment protection under the condition of soil erosion. A typical area of red soil hilly region was selected as the research site. Integrating outdoor sampling with indoor analysis, this paper studied the effect of land use type of red soil hilly region on distribution of soil labile organic carbon properties under the condition of soil erosion. The result has shown 1) land use type affects the labile organic carbon of the surface soil. There is a significant difference in the content of labile organic carbon in the 0-5 cm soil layer, but it is almost the same in the sub-layers; 2) Land use type has a great impact on the content of labile organic carbon in different poisitions of eroded land and the difference of labile organic carbon content in erosion area is higher than in deposition area; and, 3) the vertical distributions of soil labile organic carbon are basically the same among the different land use types, and the difference in surface is big, and increasingly small with the increase of soil depth.