三江平原不同土地利用类型区土壤有机碳的垂向分布特征  

Vertical distribution characteristics of soil organic carbon of different land-use types in Sanjiang Plain

作　　者：梁玉凯 Liang Yukai(Shenyang Urban Planning&Design Institute Co.,Ltd.,Shenyang 110000,China)

机构地区：[1]沈阳市规划设计研究院有限公司,辽宁沈阳110000

出　　处：《吉林水利》2024年第9期32-35,40,共5页Jilin Water Resources

摘　　要：以三江平原洪河湿地为研究区,通过采集不同土地利用类型0~60cm深度的土壤,分析不同土壤深度中有机碳的垂向分布特征及规律,并采用通径分析的方法探究了影响土壤有机碳含量的主要因子。结果表明:不同土地利用类型的土壤有机碳含量呈湿地>草甸>林地>旱田>水田的规律,且在垂向分布上呈现随深度递减的趋势,符合幂函数或指数函数的规律。对土壤的黏粒含量、含水率、土壤DOC、pH值与土壤有机碳含量进行通径分析,可得各指标的通径系数分别为0.211,0.792,0.525,-0.034,说明土壤含水率对土壤有机碳含量的影响最大,且湿地的垦殖改变了土壤含水率和黏粒含量,增加了土壤DOC和pH值,不利于土壤有机碳的累积。研究结果有助于认识不同土地利用类型的土壤有机碳含量垂向变化规律,揭示土壤有机碳含量的主要影响因子,为湿地的保护和土地资源的合理开发利用提供依据。The Honghe Wetland in the Sanjiang Plain is taken as study area.The vertical distribution characteristics 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 influencing factors of soil organic carbon content,and provide a basis for the protection of wetlands and the rational development and utilization of land resources.

关 键 词：土壤有机碳 土地利用类型 分布特征 洪河湿地 

分 类 号：S153.6[农业科学—土壤学]