生态修复区不同植物群体的根系固土力学机理  

Mechanical mechanism of soil-reinforcement for different plant communities in ecological restoration region

作　　者：万利[1] 王震洪[2] 杨成波[2] 

机构地区：[1]中国环境科学研究院河流与海岸带环境创新基地,北京100012 [2]贵州大学生命科学学院,贵阳550025

出　　处：《农业工程学报》2009年第10期278-283,共6页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家自然科学基金项目(40861015);国家水体污染控制与治理科技重大专项(2008ZX07526-002)

摘　　要：为探索生态修复区不同植物群体的根系固土力学机理,以国家生态修复工程新平县生态修复区为例,对不同恢复阶段的植被进行原位土壤根系水平抗拉力学试验。结果表明:调整后的原位土壤根系水平抗拉试验方法可在山区的斜坡上进行不同物种组成的植物群落根系力学作用的研究,同时可定量获取土壤根系水平抗拉过程中载荷与位移的关系,绘出载荷-位移(F-S)曲线。F-S曲线反映出草本样方、灌草样方、灌木样方和乔木样方的根系均具有不同的抗拉特性,都会经历弹性形变阶段、塑性形变阶段和强化阶段;这些植物根系在固土、固坡中起着重要的作用,并随着生态修复过程的发展,生态系统抵抗土体滑动的能力不断增强。The mechanical mechanism of soil-reinforcement by roots had been studied by the tests for the pull-resistance of roots of vegetation which were in different recovery stages in Xinping ecological restoration region. Results showed that this improved method was art effective method which was able to conduct the experiment on the slope of mountainous area and study the root＇s mechanics function of plant communities which were composed of different species. The relationship between load and displacement in the process of root＇s level pull-resistance was obtained quantitatively, and the F-S curve was drawn. The F-S curves showed that all kinds of roots for different plant quadrats had different tensile properties, but they all passed through the elastic deformation stage, the plastic deformation stage and the strengthened stage. These roots played an important part in soil-reinforcement. Besides, with the development of ecological restoration process, the ecosystem＇s soil-reinforcement ability was enhanced.

关 键 词：生态 修复 力学 植物群体 根系 固土力学机理 

分 类 号：S157.9[农业科学—土壤学]