The soil erosion intensifies , and then weakens vertically from the divide to the edge of the gully , apart from the central section of the land because there is a ridge 坡面中部侵蚀相当严重，分水岭与沟缘线附近相对较轻。地形因子中的坡度是形成坡耕地土壤侵蚀垂直分异格局的主要影响因素。
It is important to reveal the law of soil erosion and develop soil erosion forecast model , which has a bearing on preventing the loess of water and soil 坡耕地作为重要的侵蚀产沙区，揭示其土壤侵蚀规律和泥沙运移方式，对建立土壤侵蚀预报模型、加强土地管理防止土壤退化具有十分重要的意义。
With the proportion does not change at present ( namely ca ( h2po4 ) 2 = 2 : 1 ) , the application rate of each mu slope cultivated land should be rised to 100 kg nh4hco3 + 200 kg ca ( h2po4 ) 2 在目前施肥比例不变的前提下(即碳铵：过磷酸钙= 2 ： 1 ) ，每亩坡耕地施肥量应从50kg碳铵+ 100kg过磷酸钙增加到每亩100kg碳铵+ 200kg过磷酸钙。
The mountain region agriculture is a sloping field form of agriculture . because of the special characteristics of the terrain in sloping style agriculture , portions of land are widely dispersed , and soil erosion is serious 山区农业是一种坡地农业，坡耕地由于其地形特点，地块分散零碎，水土流失和跑土、跑水、跑肥严重。
Results showed that available k and ( no3 ) ^ ( - 1 ) content were higher in surface runoff in slope cropland and intercrop land between crop and forestry than those in fallow land , intercrop land between forest and grass and afforestation land 研究结果表明： ( 1 )坡耕地及农林间作下地表径流中的有效钾和硝态氮含量高于撂荒荒坡、林草间作和造林林地。
The soil erosion has become more and more intensive horizontally from the ridge to the center of the shallow gully . the soil erosion intensifies , and then weakens vertically from the divide to the edge of the gully 在水平方向上，由浅沟分水脊经浅沟沟坡到浅沟中心， 7be和’ 37cs复合示踪坡耕地土壤侵蚀产沙的空间分布特征土壤侵蚀强度逐渐增强;在垂直方向上，从分水岭到沟缘线土壤侵蚀强度呈先加强后减弱的趋势。
Effects and mechanisms on reducing soil and water loss in hedgerow ecosystems ( 1 ) hedgerows are capable of retaining water and soil under actual and simulated rainfall conditions . rain erosive power and rainfall were higher in june and august than in other months in 2001 植物篱笆生态系统减水减沙效应及机理( 1 )自然降雨和人工降雨条件下，坡耕地植物篱笆均具有明显的水土保持效应，而且这种效应在植物篱笆的生长后期更为突出。
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。
Therefore , nowadays major problem is how to reduce the slope cultivated land ' s soil erosion and sediment concentration transporting to three gorges reservoir in order to prolong the three gorges engineering ' s use time and protect the safety of the middle and lower reaches channel of yangtze river 因此当前的主要问题是如何臧轻坡耕地土壤侵蚀，减少进入三峡库区的泥沙量，延长三峡工程的运转时间，保障长江中下游河道的安全。另外，按土壤平均厚度78 。
However , only a few studies have conducted research in their soil and water conservation effects and mechanisms ( abbreviated as swcem ) , and this necessitates further research . to provide the improvement and establishment of the hedgerow ecosystem models with scientific guidance , this paper takes red soil slope fields as the object study area to discuss the swcem of hedgerows , through field experiments and on site investigation 为此，本研究以南方红壤坡地为研究对象，在定点试验和调查研究的基础上，采用田间试验和室内分析相结合的研究方法，对坡耕地和严重侵蚀坡地植物篱笆生态系统的水土保持效应和机理进行了研究，以便为改善和创建植物篱笆生态系统模式提供科学依据。
