科尔沁沙地不同演替阶段植被特征及固沙作用

Vegetation characteristics and there effect on sand dune stabilization of different succession stages in Horqin sandy land

为了解不同措施对退化生态系统植被恢复的作用,采用空间代替时间的方法研究了科尔沁沙地不同演替阶段的植被变化特征,同时探讨了植被的抗风蚀及固沙作用。结果表明,人工植被恢复措施可有效提高沙丘的植被盖度和物种丰富度,多年生植物逐渐取代了一年生植物;沙丘与草场的植被相似性较差;植被的抗风蚀能力随植被盖度的增加而增加。根据目前植被的发展现状,对不同演替阶段的植被保护、管理和恢复提供了科学的指导意见。

In order to solve the effects of different methods on the vegetation restoration in degeneration ecosystems, using the spatial succession instead of temporal succession, the dynamics and characteristics of vegetation in different succession process in Horqin sandy land are analyzed, the capacity to resist wind erosion and the effects on sand dune stabilization of vegetation are also discussed. Results showed that artificial vegetation restoration could increase cover degree and species number remarkably; perennial species replaced the annual species gradually; species similarity of sand dune and grassland was low; the more cover degree was, the stronger of the vegetation capacity to resist wind erosion. Based on the current vegetation status of succession process, scientific suggestions related with vegetation protection, management and restoration are offered.