岷江上游干旱河谷-山地森林交错带植被退化机制分析

Mechanism of vegetation degradation at the ecotone of mountain forest and dry valley along upper reaches of Minjiang River

岷江上游是典型的以干旱河谷为基带的山地生态系统,其脆弱的生态环境严重阻碍了当地社会经济的发展,鉴于此,本文选取岷江上游的理县熊耳山山地森林-干旱河谷交错带为研究区,研究其上的植被退化特征,并以此次本底调查资料为基础,探索研究区生态系统退化的机制,在此基础上提出研究区生态恢复与重建的一些措施,以期能为完善交错带生态演替过程理论和山地森林-干旱河谷交错带植被恢复及复合生态系统管理提供理论依据.

The upper reaches of Minjiang River are typical mountain eco-systems characterized by dry valley baseline.Its fragile eco-environment has seriously hindered the development of local society and economy.This paper selects the ecotone of mountain forest and dry valley as studying area at the upper reaches of Minjiang River on Xionger Mountain in Li County,and studies the degradation characteristics of vegetation.The degradation mechanic of the studying area ecosystem is explored based on the information of the investigation.According to the analysis,some measures are proposed to recovery and rebuild the ecology of studying area,hoping to provide some theoretical bases such as ecological succession theory in ecotone,vegetation restoration at the ecotone of mountain forest and dry valley and the management of composite ecosystem.