干扰对草地生态系统生物多样性的影响

Effects of Disturbances on Species Diversity in Grassland Ecosystems

干扰是草地退化、沙化、盐碱化的重要原因，同时也是草地生态系统生物多样性变化的主导因子．国外关于干扰对各种植被的影响已有详细报道，但国内这方面的研究却很少．通过分析放牧、火烧、刈割、采药、水淹等干扰因子及不同干扰频率对草地生态系统生物多样性的影响，阐明各干扰因子及不同于扰频率的不同作用．为保护草地生物多样性及制定合理的草地利用制度提供科学依据．

Distrbances are the important factors which cause the deterioration,desertation,sallnization and the varirations of species diversity in grassland ecosystems.Event hough the effects of disturbances on species diversity have been well documented in many types of vegetations in abroad,but there are no morereports on this disclpline In China.In order to have the role of each disturbance understood, the effects of grazing,mowing, burning,coilecting medicinal herbs and flooding disturbances on grassland ecosystems were discussd in this paper. The aim is to promote the protecting of spedes diversity and to make scientific utilization system in grassland ecosystems.