江西省不同农业土地利用方式对土壤有机碳的影响

Impacts of Various Agricultural Land Use Patterns on the Content of Organic Carbon in Soil in Jiangxi Province

研究目的:研究江西省不同农业土地利用方式下的土壤有机碳含量。研究方法:实地土壤样品采集分析与第二次土壤普查资料相结合、GIS空间插值与比较分析相结合的综合研究方法。研究结果:江西省农业土地利用方式和土壤类型不同,土壤有机碳含量存在较大差异;在农业土地利用方式下表层土壤有机碳含量一般为:菜地>稻田>有林地>旱地土壤>荒草地;从第一次土壤普查到2008年稻田土壤有机碳含量逐步提高,而且所有农业土地利用方式下土壤有机碳含量均随土壤深度增加而减少。研究结论:通过农业土地利用管理和土壤管理措施的调整,可以增加土壤有机碳的贮量,提高农田有机碳稳定性,减缓大气中CO2浓度增加。

The purpose of this paper is to assess the contents of organic carbon in soil under various agricultural land use patterns in Jiangxi Province. Methods employed are （1）to combine the results of field soil sampling and laboratory analysis with the results of the second soil general survey, and （2）to integrate the GIS spatial interpolation with comparative analysis. The results indicate： （1）the agricultural land use patterns and soil types in Jiangxi Province are different;（2）the content of soil organic carbon are in large differences among different land use patterns;（3）within agricultural land use patterns, the sequence of the organic carbon contents from high to low is generally as following, i.e., vegetable field, paddy field, forest land, dry land, and wild grassland;（4）the soil organic carbon contents was gradually increasing from the first soil survey to 2008, and the soil organic carbon contents of all agricultural land use patterns was decreasing from the surface to deep level of the soil. It is concluded that through agricultural land use management and adjustment of soil management measures, the content of soil organic carbon can be increased, the stability of organic carbon in farmland can be enhanced, and concentration of CO2 in the atmosphere can be relieved.