青海共和盆地沙化土地生态修复效果的研究

 以青海省共和盆地黄沙头沙地为例,在植被调查和分析的基础上研究青藏高原高寒沙化土地的生态修复效果。结果表明:封沙育草、丘间造林和沙障等措施能够启动高寒流动沙地的植被恢复过程,有效提高植被盖度、代表演替后期的优势物种的盖度和多年生草本植物的物种丰富度;流动沙地治理地块的边缘因为容易受到未治理地块的风沙影响,植被恢复速度较慢。研究结果对改进流沙治理技术具有指导意义。认为尽管流沙治理地块的这种“边缘效应”难以从根本上消除,但可以通过扩大治理地块的面积予以弱化,因为这样能降低治理地块的边缘与核心部位的面积比,从而保证有更大比例的核心部位能快速恢复其植被。

Ecological restoration in alpine sandy lands of Gonghe basin, Qinghai province

Effects of ecological restoration in alpine sandy lands was studied at Huangshatou,Qinghai Province,where land desertification was heavy and whose sandy lands were representative on Qinghai-Tibet Plateau.The results showed that enclosure,inter-dune planting,and sand barriers were able to facilitate the process of revegetation or vegetation restoration,characterized by the enhancement of vegetation cover,cover of indicator or dominant species indicating late stage of succession,and species richness of perennial grass;Because the process of plant establishment was prevent by drifting sand from uncontrolled sandy land at the edge of controlled sandy land,vegetation restoration were slower there than in the core part.For the sake of better rehabilitation,an improvement was recommended therefore on how to control sandy lands.Even if the negative "edge effects" occurring in the process of vegetation restoration could hardly be removed thoroughly,they may be weakened and confined to some extent through enlarging the area of controlled sandy land.If so,the area proportion of core part to edge would be enhanced,and then more lands would be given the chances to restore their vegetation.