论文部分内容阅读
疏密适中的森林,其输沙量只是采用更集约的土地利用方式所带来的输沙量的很小一部分.扰动一片流域的植被和土壤的任何行动都可能使输沙量增大.森林实践活动通常导致输沙量短期内稍稍增大.输沙量显著增大基本上仅限于采用重型机械的实践活动.因林业生产活动生成的泥沙,即使不怎么修改当前的有关规定,也可以使之减少.受到同样一种处理的一片片相似立地,它们的输沙量相差达百分之好几百.只要耕种期间河床扰动得以避免,只要采用和实现预期耕种效果一致的最低限度处理方式,输沙量就可显著降低.规定耕种处理方式时,应该格外注意斜坡和土壤的侵蚀度.只要对林道和集村小道精心进行设计、规划、修筑、使用和保养,森林的输沙量就可大大减少.
In densely populated forests, sediment discharge is only a small fraction of the sediment load caused by more intensive land-use patterns, and any action that disrupts vegetation and soil in a watershed may increase sediment load. Practices usually result in a slight increase in sediment load in a short period of time, and the significant increase in sediment load is basically limited to the practice of heavy machinery. Because of the sediment produced by forestry production activities, even if the current regulations are not changed much, So as to reduce the amount of sediment transported by the same type of treatment to a few hundred per cent.Whether disturbances in the river bed during cultivation are avoided by applying a minimum treatment approach consistent with the expected effect of the cultivation , The amount of sediment can be significantly reduced.When stipulating the cultivation method, we should pay special attention to the slope and soil erosion.As long as careful design, planning, construction, use and maintenance of forest road and village trail, the forest sediment load Can be greatly reduced.