摘要
干旱、半干旱区的林地在保护国土、改善生态环境、维护生态平衡、拓宽人类活动空间、优化生存环境质量等方面起到了重要作用;尤其是在生态失衡,环境遭到破坏的荒漠化发生地区,以某种特殊目的营建起的农防林、水土保持林、水源涵养林等既是农牧业的人工防护屏障,又是整个农业生态系统的骨架;但是同时也讨论由于过度放牧、樵采和垦荒等破坏植被后导致的沙化,使林地成为沙源地的特殊情况。
The woodlands, in arid and semi- arid areas, play an important role in protecting territory, improving entironment, maintenanting the ecosystem equilibrium, broadening the movable space of human,optimizing the quality of existing environment etc. Especially in areas of ecosystem unbalanced and the areas of desertification occurring of the environment had been destructed, the agriculture shelter forest,water and soil conservation wood and headwaters self-restraint wood which had been built are artificial protection natural cover and framework of the whole agriculture ecosystem. However,the special ease which led to desertification by excess pasturing, exploitation felling trees and bringing wasteland under cultivation etc. is discussed, and which made woodland turn into sand ground.
出处
《水土保持研究》
CSCD
北大核心
2007年第2期280-282,共3页
Research of Soil and Water Conservation
基金
国家自然科学基金项目(40561003)资助
关键词
半干旱区
林地
沙化
semi-arid areas
woodland
desertification
