杉木幼林地水土流失与降雨特性关系研究

本文通过连续三年定位研究，全面探讨降雨特性对炼山与不炼山的杉木幼林地水土流失的影响，结果表明：本区年均降雨量和降雨侵蚀力（ＥＩ３０）为１５０８．０ｍｍ和６０２．１［１００Ｊ·ｃｍ／（ｍ２·ｈ）］，侵蚀性降雨占全年降雨次数的３４％～４０％；杉木幼林地水土流失随降雨侵蚀力增大而增加；林地水土流失量主要由大雨和暴雨两种降雨类型所引起，充足的前期降雨会加剧林地水土流失，尤其是在旱季；炼山的杉木林地水土流失随降雨的年分布特点而呈明显的季节性变化；在不同降雨条件下，炼山林地水土流失均明显大于不炼山林地．因此增加地表覆盖和选择合适的营林作业方式和时间是防止炼山林地大量水土流失的有效途径。

Studies on Relations between Water and Soil Erosion in Young Chinese Fir Forest Land and Precipitation Properties

In this paper, through fixed position research for three years in succession, the influence of water and soil erosion in burning and unburning forest land of young Chinese Fir on precipitation properties have been studied,the results showed that the whole year precipitation amount and precipitation erosion power were 1508mm and 602. 1 (100J. cm/m. hr), respectively, the times of erosion precipitation accounted for 34 -40% of the total precipitation times, the water and soil erosion amount in young Chinese Fir land increased with precipitation erosion power and mainly arised from two types of large precipitation and rainstorm, the enough early days' precipitation could accelerate water and soil erosion in forest land, especially in dry season,the water and soil erosion amount in burning forest land appeared significantly seasonal change with precipitation distribution properties of year, in different precipitation conditions, the water and soil erosion amount in burning forest land was much more than unburning forest land. So increasing coverage degree of forest land and choosing suitable methods and time of forest management were available approaches to prevent from larger water and soil erosion in burning forest land.