黄土丘陵区土壤侵蚀对土壤有机碳流失的影响研究

Effect of Soil Erosion on Soil Organic Carbon Loss on the Loess Hilly Areas

土壤侵蚀是造成土壤中有机碳迁移、流失的主要原因,也是陆地碳循环的重要动力过程之一。通过野外径流小区观测和室内分析的研究结果表明:土壤有机碳流失主要随着泥沙流失,最高可以达到95%以上;土壤侵蚀造成了有机碳在泥沙中的富集,且富集比大于1。植被覆盖度对小区有机碳的流失有很大的影响,随着植被覆盖度增大,土壤有机碳的流失减小。侵蚀强度与泥沙中有机碳含量呈递减的对数关系;而与土壤有机碳流失程度呈明显的线性关系。

Soil erosion does not only lead to the loss of surface soil,soil degradation,water contaminated,and the soil erosion process also goes with transference of soil organic carbonc SOC.The effect of soil erosion on SOC in the different vegetation coverage and sloping gradient within the runoff plots.were studied The result shows that the main way of SOC loss is the loss accompanied with the sediment, accounting for 95% above of SOC; the loss amount of SOC decrease with the increasing of vegetation coverage. The soil erosion results in the enrichment of SOC in sediment, and the enrichment ratio is greater. The organic carbon content in sediment and SOC loss degree are related to erosion intensity.