中文摘要：

利用野外模拟人工降雨试验,对人为加速侵蚀下耕地、草地和林地的水土与养分流失进行耦合研究。结果表明：人为加速侵蚀后养分随径流和泥沙的迁移,导致土壤肥力下降,其中泥沙结合态是养分流失的主要途径。耕地翻耕后加速土壤侵蚀,除产流量减少22.4%外,侵蚀速率和产沙量分别增加了27.1%和27.3%;总有机碳、总氮和总磷流失量分别增加104.5%,42.5%和59.5%。草地和林地的蓄水保土效果显著,开垦后侵蚀速率分别增加了188.9%和10 225.1%,产沙量分别增加了190.6%和9 370.0%,产流量分别增加了44.9%和85.3%;流失总有机碳、氮和磷量分别增加104.1%,69.9%和18.2%。林地去除枯枝落叶层后总有机碳、总氮、总磷流失量分别是自然状态下的6.1,4.7,15.1倍,且养分流失以可溶态养分为主;而开垦后流失总量分别是自然状态下的18.1,8.6,27.2倍,且养分流失以泥沙结合态为主。

英文摘要：

The coupling effect on erosion and nutrient lost of arable,grassland and woodland,were studied based on different land-use patterns,with simulated rainfall equipment.The results showed that the runoff and sediment caused the soil became less fertile.The nutrient in sediment was higher than that in run-off,which was the main ways of nutrient losses.Man-made accelerated erosion caused by arable land tillage,soil erosion rate（SER） and sediment yield（SY） increased by 27.1% and 27.3%,but runoff yield（RY） decreased by 22.4%.The total dissolved organic carbon（TDOC）,total nitrogen（TN） and total dissolved phosphorus（TDP） in soil,increased by 104.5%,42.5% and 59.5%,compared with natural soil.There was a significantly effect on water and soil conservation of grassland and wood land.The SER increased by 188.9% and 10 225.1%,SY increased by 190.6% and 9 370.0%,RY increased by 44.9% and 85.3%,respectively,in grassland and woodland,compared with natural soil.The TDOC,TN and TDP increased by 104.1%,69.9% and 18.2% after grassland and woodland,respectively.Compared with natural soil,the TDOC,TN and TDP increased by 6.1,4.7,15.1 times after remove forest litter,but increased by 18.1,8.6,27.2 times after tillaged.The main way of nutrient loss with run-off after remove forest litter,while with sediment after tillaged.