黄河孟津段河岸带土壤有机碳分布特征及影响因素分析OA北大核心CSTPCD

[Objective]The purpose of this study is to investigate the differences in the spatial distribu-tion of soil organic carbon in the riparian zone of the Mengjin section of the Yellow River,and to provide a theoretical basis for soil carbon sequestration and ecological restoration of the riparian zone of the Yellow River.[Method]The spatial distribution of soil organic carbon and its influencing factors were analysed using Kriging interpolation and redundancy analysis,and the correlations between soil organic carbon content and microtopography,soil physical properties and vegetation assemblage were investiga-ted.[Result]The mean values of soil organic carbon content and soil organic carbon density in the study area were 1.94 g·kg-1and 0.11 kg·m-2,respectively,with spatial coefficients of variation of 69.9％and 83.6％,which were of moderate variability.The soil organic carbon content in the study area in-creased with the increase of the distance from sample zones V1 to V5 in the vertical river direction,and the soil organic carbon content in sample zone V5 was significantly higher than that in the three sample zones V1 to V3.In the correlation and redundancy analyses,the soil organic carbon content in the study area was significantly positively correlated with the distance from the vertical river,soil water content,and soil clay,negatively correlated with soil sand,and not significantly correlated with plant community and altitude.[Conclusion]The soil organic carbon content in the riparian zone,with strong spatial auto-correlation,increases with the increase of vertical river distance.The riparian microtopography,soil clay and soil water content significantly affect the spatial distribution of soil organic carbon.