侵蚀对苏南丘陵区非耕作土土壤质量的影响  

Soil Erosion Impact on Soil Fertility of Uncultivated Soil in the South Jiangsu Province

作　　者：张燕[1] 杨浩[1] 张洪[2] 彭补拙[2] 

机构地区：[1]中国科学院南京土壤研究所开放实验室,南京210008 [2]南京大学城市与资源学系,南京210093

出　　处：《水土保持研究》2003年第4期175-178,共4页Research of Soil and Water Conservation

基　　金：国家自然科学基金重点项目(49831070);国家自然科学基金项目(49973027)资助。

摘　　要：只要具备适宜的条件,土壤侵蚀就会发生,苏南丘陵区也不例外。以137Cs示踪法进行的研究表明,尽管植被覆盖良好,自然状态下的苏南坡地非耕作土上仍有土壤侵蚀发生。虽因地貌、气候等条件使这里的土壤净流失量不大,可是侵蚀还是引起土壤颗粒粗化,且主要丢失的是粉粒;并使土壤中有机质、全氮、全磷含量减少,即造成土壤质量退化。此外,当地土壤肥沃,侵蚀及伴随的养分流失产生的异地生态损害亦不容忽视。137Cs tracer method was used to investigate soil erosion intensity. It indicated that although the plant cover in sloping land of the south Jiangsu Province is well, there still was soil erosion in uncultivated soils. Soil erosion is not serious because of favorable condition of landform and climate. At the mean time soil particlesize distribution, contents of soil organic matter, total nitrogen, total phosphorus were measured to analyze the erosion effect on the physical and chemical properties of eroded soils. The results indicated that soil erosion would lead to soil particle coarseness. And the loss soil particles due to erosion were mainly silt. Moreover, the erosion may also caused soil nutrients decrease in the eroded soil. That is, the erosion would accelerate soil fertility degradation. Besides the erosion impacted on onsite soil fertility the loss of soil nutrient would threaten the water ecological environment in this area. Therefore, in order to overcome soil fertility degradation and its offsite ecological damage it is necessary to control soil erosion. 

关 键 词：土壤侵蚀 ^137Cs丢失量 土壤粗化 土壤养分减少 土壤质量退化 

分 类 号：S157.1[农业科学—土壤学] S158.1[农业科学—农业基础科学]