With the people ' s transporting of three gorges area the reclamation ratio of steep slope sloping plantation has increased to 43 . 7 % , however , it is a unquestionable fact that the three gorges region ' s slope cultivated land is the major material resource of water and soil loss 42万ho ，而山地面积占这一区域的74 。随着移民搬迁，使陡坡地的耕垦率已高达43 7 ，而三峡地区坡耕地是水土流失的主要物质来源己是无可争议的事实。
The disaster of drought and waterlog is severely and frequently , the water and soil loss and rock desertification is increasing , the subsidence is happened at some ground , the bio - diversity decrease , the vegetation and soil evolve conversely , the productivity declines , the people lives in difficulty , and the most phenomenon and types of ecological problem are concentrated in karst area . to strengthen studies on karst ecological characteristics and degradation types can provide gist for ecological rehabilitation and reconstruction in karst area , but also can provide means for reference for other ecology area 严重而频繁旱涝灾害、水土流失、石漠化现象加剧、地面塌陷、生物多样性丧失、植被与土壤出现逆向演替、生产力水平降低、人居生活困难等，集中了全球生态问题的主要表现和主要类型；因此，加强对岩溶区生态特征和退化类型的研究，不但能为岩溶区生态的恢复和重建提供依据，也为其它生态区的研究提供方法借鉴。
The inland hillslope research methods are dominated by qualitative analysis and statistic analysis , therefore , much more studies need to be made to the hillslope water and soil mechanisms and processes , the prediction and evaluation of plane source pollution resulting from nutrient loss , the quantitative prediction model of hillslope water and soil loss and the interaction between the control measures and hillslops 国内对坡面的研究方法以定性和统计分析为主，在坡面水土流失机理及过程，养分流失所造成的面源污染的预测及评价，坡面流失定量预测模型以及控制措施与坡面的相互作用等方面仍需作进一步研究。
Moreover , hedgerow ecosystems were effective in controlling water and soil loss in june and august . under simulated rainfall , hemercoallis citrina baroni and p . rotation flligg hedgerow ecosystems had a significant effect on reducing water and soil loss in their later stages of plant growth , and there was a significant positive correlation between the effect on reducing water and soil loss and the rain intensities . moreover , hedgerow ecosystems decreased more soil loss than runoff , and the initial time of runoff incidences could well represent the water and soil conservation effects of hedgerow ecosystems Rotatumflligg )植物篱笆生态系统年径流量、年侵蚀量分别减少10 . 14 11 . 56倍和135 . 34 165 . 84倍；植物篱笆生态系统和大豆单作处理的径流量、侵蚀量、可产生侵蚀的降雨量之间呈极显著正相关，建立了相应的降雨产流、降雨产沙、径流侵蚀模型，通过侵蚀雨量可以了解水土流失的发生特征； 6月和8月份(多短时暴雨)水土保持能力较明显。
The results show that ( 1 ) the system of contour dams , contours and fallow had positive impact on water and soil losses than grass stripes and contour ditch . at the same time it was showed that contour dams , contours , fallow significantly reduced soil erosion and water loss , grass stripe and contour ditch had recorded reduction in water and soil losses although to a much less extent than above 3 farming systems . most of sediment was bed load in all the systems except in contour dams and contour fanning 研究的主要结论如下： 1 、运用坡面径流小区法系统地研究了当地农业生产活动中不同农作措施下红壤坡耕地水土流失特征、土壤养分流失规律及形态特征，结果表明： ( 1 )同顺坡农作措施相比：其它农作措施均具有明显减轻水土流失的作用，等高土埂，等高农作、休闲处理控制水土流失的效果优于水平草带和水平沟处理。
Soil erosion and nutrient losses in jiangjiatang watershed in lanxi city in zhejiang province during exploitation was studied from 1993 - 2000 using adoptive research methods such as runoff plot , catchment area , and rare earth element tracer ( eu ) , and the soil fertility index appraisal . the major conclusions are as follow : 1 . the principle of water and soil losses together with nutrients and the forms in which they were lost were studied under different fanning systems in runoff plot 本研究选择浙江省中部金衢盆地边缘兰溪市水土保持监督站蒋家塘小流域为研究试验点，以协作单位兰溪市水土保持监督站小流域开发试验区为基础，采用坡面径流小区法、单源汇水试验区出口实测法、稳定性核素- eu土芯示踪法研究了2000年坡耕地不同农作措施水土流失规律及养分流失规律和小流域综合开发过程中水土流失规律及养分流失规律，并对小流域侵蚀土壤的肥力现状进行评价。
Soil is the base of agriculture production , the key measure to prevent water and soil loss is to conserve soil , but most soil nutrient is lost with the sediment loss , and serious water and soil loss make the soil thickness degrease , the soil nutrient be deficient and lean , the land quality degrade and the yield of plant decrease , all this results is going to threaten the people ' s transplanting and the agriculture sustainable development , and restrict the economy development of three gorges regions 同时，土壤是农业生产的根本，治理水土流失的关键是要保住土壤，而土壤养分绝大部分是随着泥沙流失的，严重的水土流失造成土层浅簿、养分贫瘠，土地质量退化，产量下降，对三峡库区移民工作和农业可持续发展造成严重威胁，制约三峡库区经济发展。因此进行三峡库区坡耕地土壤侵蚀机理研究，探索减轻坡耕地土壤流失的方法措施，具有全局性的重大意义。
Based on the background of biologic measures applying in soil and water conservation , with the help of the monitor of environment restoration , starting with society . economy and environment , to achieve dynamic monitor and regular update of information , providing quantitative data for the restoration of areas suffering from water and soil losses , and furthermore to stride forward the development of biologic measures applying in soil and water conservation and to construct the sustainable development of society , economy and environment 以生物措施治理水土流失项目为背景，设计了生态修复监测系统，从生态、经济和社会效益入手，实现动态监测和信息定期更新，为水土流失区生态修复工作的开展提供定量数据，从而进一步推动生物措施治理水土流失的发展，营建社会、经济、环境的可持续发展。
Through the water and soil conservation , may establish the ecological environment , the water resources and the soil cultivation protection system , achieves sets up defenses in depth , control the water and soil loss , promotes the countryside ecological environment to transform to the positive cycle , enable the water and soil resources get effective protection , and creates the condition for the agricultural development 通过水土保持，可以建立生态环境、水资源和土壤耕作保护体系，做到层层设防，节节拦蓄，控制水土流失，促进农村生态环境向良性循环转化，使水土资源得到有效保护，并为农业发展创造条件。
