西江下游流域森林土壤有机碳空间分布特征

Spatial Distribution Characteristics of Forest Soil Organic Carbon in the Lower Reaches of Xijiang River Basin

以西江下游流域内121个森林土壤采样点的实测数据为依据,通过统计分析与空间制图探究西江下游流域森林土壤有机碳含量的空间分布规律。结果表明,研究区域内5个土层(D1-D5,0~100 cm)有机碳含量的平均值分别为15.57 g/kg、11.29 g/kg、10.8 g/kg、10.04 g/kg和9.57 g/kg;D1与D2-5土层之间均存在极显著差异,D2与D5土层之间存在显著差异。有机碳含量的平均水平在D1土层达到最高,D2-5土层逐渐降低。其余各土层之间的有机碳含量均不存在显著差异,空间变异性小,该区域土壤有机碳含量相对稳定。

Based on the measured data of 121 forest soil sampling points in the lower reaches of the Xijiang River,this paper explores the spatial distribution of forest soil organic carbon content in the lower reaches of the Xijiang River through statistical analysis and spatial mapping.The results showed that the average organic carbon content of five soil layers(D1-D5)in the study area was 15.57 g/kg,11.29 g/kg,10.8 g/kg,10.04 g/kg and 9.57 g/kg,respectively.There were significant differences between D1 and D2-D5 soil layers,and there were significant differences between D2 and D5 soil layers.The average level of organic carbon content reached the highest in D1 soil layer,and gradually decreased in D2-5 soil layer.There was no significant difference in organic carbon content between the other soil layers,and the spatial variability was small.The soil organic carbon content in this area was relatively stable.