论文部分内容阅读
通过对坡面产沙、植被水土保持机理以及库区坡面植被水土保持生态建设模式的研究,结果表明:减小水流拖拽力、水流上举力以及增大土壤的黏聚力都有利于水土保持;植被冠层及枝干的水土保持作用主要体现在植被冠层的水分截留、削弱降雨的溅蚀功能以及抑制地表径流等几个方面;而根系的水土保持作用主要体现在菌根及分泌物能降低土层重度、增加土层的黏聚力,根系能增加土体的有效孔隙度、改善土体的渗透性能。库区坡面有效的水土保持栽植模式应该是:在坡顶,以封山育林为主;在坡面,应垄沟结合,辅以坡改梯等配套工程措施,种植附加值较高的经济作物。
Through the research on the process of sand production on the slope, the mechanism of water and soil conservation and the ecological construction mode of soil and water conservation on the slope in the reservoir area, the results show that reducing the drag force of water flow, lifting force on water flow and increasing the cohesion of soil Soil and water conservation; the role of soil and water conservation of vegetation canopy and stems is mainly reflected in the water cut-off of vegetation canopy, the erosion function of rainfall attenuation and the suppression of surface runoff and so on. The root and soil conservation are mainly reflected in mycorrhiza and Secretions can reduce the heavy soil layer, increase the cohesion of soil, the root system can increase the effective porosity of soil to improve soil permeability. The effective soil and water conservation planting pattern on the slope in the reservoir area should be: at the top of the slope, the main feature is the closing hillside afforestation; on the slope, combining the ditch and ditch with the engineering measures such as sloping and climbing the ladder to plant the cash crops with higher added value.