摘要
通过对深丘区环境背景特征的研究，探讨了建设防护林体系的重要性．根据防护林体系的配置和观测体系的布置，以流域为单元、分层研究了防护林体系的综合效益。研究表明：营建后的防护林体系，可使坡面径流减少６２％，径流含沙量减少６９％，流域的年径流量和产沙量均有显著变化，森林覆被率每增加１％，年径流探减少４．２ｍｍ，泥沙减少３．７％，但枯季径流略有增加。
Based on studies of evironmental features in hilly land,a discussion is made on the importance of building a protection forest system. Taking a water catchment as a unit,research is madeon the Comprehensive benefits of the protection forest system according to its arrangements. The resultshave shown that the slope runoff and the Sediment concentration of runoff can respectively decrease by 62 % and 69 % after the construction of a protection forest system. In addition,annual runoff volume and sediment yield in the water catchment have an evident change. Along with an increase of 1 % for each time in forest coverage,annual runoff depth and sediment will respectively decrease by 4. 1 mm and 3. 7%,but the runoff in the dry season will increase a little.
出处
《四川林业科技》
北大核心
1996年第2期20-24,共5页
Journal of Sichuan Forestry Science and Technology
关键词
深丘区
防护林体系
生态效益
Hilly land
Protection forest system
Ecologic benefit
