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开发建设项目对水土资源的破坏程度是一般耕作活动的100倍之多,为了降低其径流中泥沙含量,通常采用谷坊、沉沙池等措施。研究表明其它材质的谷坊在拦截泥沙方面作用超过了石谷坊。2009年美国土壤学家R.A.Mclaughlin等人进行植物谷坊与石谷坊在拦截泥沙方面效果的研究。结果表明:植物谷坊拦截泥沙作用明显,植物谷坊+PAM处理拦截泥沙效果更加显著。植物谷坊+PAM处理平均浊度值约为石谷坊处理的1/8。植物谷坊+PAM处理减少悬浮固体物质含量为石谷坊的5倍。其费用植物谷坊也远低于石谷坊。说明植物谷坊对于防止线型开发建设区域内土壤侵蚀既有效,又经济。
Development and construction projects on the degree of destruction of water and land resources is 100 times the amount of general farming activities, in order to reduce the sediment content of its runoff, usually using the valley, settling pond and other measures. Studies have shown that cereals of other materials outperform Stone Valley in blocking sediment. In 2009 American soil scientist R.A. McLaughlin et al. Conducted a study on the effects of plant valley and Shifangfang in intercepting sediment. The results showed that the effect of interception of silt by plant valley was obvious, and the effect of interception of sediment by plant valley + PAM was more significant. The average turbidity value of plant valley + PAM treatment is about 1/8 of the stone valley treatment. Plant Valley + PAM treatment to reduce the suspended solids content of Stone Valley 5 times. The cost of plant Valley Valley is also far below the Stone Valley Square. This shows that Plant Valley is effective and economical to prevent soil erosion in linear development and construction area.