东江中下游流域森林土壤有机碳空间分布特征研究

Spatial Distribution Characteristics of Forest Soil Organic Carbon in Middle and Lower Reaches of Dongjiang River Basin

土壤有机碳是森林土壤肥力的重要组成部分,能为植物生长提供所需要的养分,对土壤物理化学性质有重要影响。研究通过对东江中下游流域内192个土壤样点进行分层采样,统计分析有机碳含量在各土壤层之间的空间分布。结果显示,4个土壤层(D1~D4,0~80 cm)有机碳含量的平均值分别为13.817 g/kg、8.464 g/kg、6.538 g/kg和5.476 g/kg;D1~D4土壤层随土壤深度的增加,有机碳含量整体降低,每个土壤层的空间变异性逐渐减小;垂直方向上各土壤层之间均存在显著差异。

Soil organic carbon is an important part of forest soil fertility,which could provide the nutrients needed for plant growth and has an important impact on the physical and chemical properties of soil.In this study,192 soil samples in middle and lower reaches of Dongjiang River Basin were stratified and the organic carbon content was determined,and the spatial distribution of organic carbon content among soil layers was statistically analyzed.The results show that mean organic carbon content of the four soil layers(D1~D4)was 13.817 g/kg,8.464 g/kg,6.538 g/kg and 5.476 g/kg,respectively.With the increase of soil depth,the organic carbon content of D1-D4 soil layer decreased as a whole,and the spatial variability of each soil layer gradually reduced.There are significant differences between soil layers in the vertical direction.