Vertical distribution characteristics of soil organic carbon of different land-use types in Sanjiang Plain
The Honghe Wetland in the Sanjiang Plain is taken as study area.The vertical distribution charac-teristics and rules of organic carbon in different soil depth are analyzed by collecting 0～60cm soil of different land-use types.The main factors affecting soil organic carbon content are analyzed by path analysis method.The results showed that the soil organic carbon content of different land-use types is wetland＞meadow＞forest land＞dry field＞paddy field,and shows a downward trend with depth,and the change trend is in line with the law of power function or exponential function.Path analysis of soil clay content,water content,soil DOC,pH value and soil organic carbon content shows that the path coefficients of each index were 0.211,0.792,0.525 and-0.034,respectively,indicating that soil water content has the greatest influence on soil organic carbon content,and the reclamation of wetlands has changed soil water content and clay content.The soil DOC and pH values increased,which is not conducive to the accumulation of soil organic carbon.The research results are helpful to understand the vertical variation of soil organic carbon content in different land-use types,reveal the main in-fluencing factors of soil organic carbon content,and provide a basis for the protection of wetlands and the ra-tional development and utilization of land resources.
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