鄂西三峡库区防护林林分质量综合评价

1　引　　言鄂西三峡库区地处亚热带气候区 ,自然环境优越 ,热量雨量充沛 ,境内森林类型和生物物种丰富多样 ,且具有我国东西与南北两大生物界过渡的特点 ,亚热带至寒温带性质的森林都有分布2 ] .库区内现有森林植被是长江上干流防护林体系的重要组成部分 ,对三峡库区的水源涵养、河川水流调节、防止水土流失以及发挥三峡水利枢纽工程的生态屏障功能都具有十分重要的意义 .目前围绕三峡库区生态林业的各项内容所展开的研究虽然不少 ,但是对于鄂西三峡库区不同类型森林植被质量评价方面缺乏系统全面的研究 ,或者只是停留在定性的描述之上 ,…

Synthetic evaluation on stand quality of protection forests in the Three Gorges Reservoir Region in Western Hubei Province

Stand qualities of 19 kinds of protection forests in the Three Gorges Reservoir Region in Western Hubei Province were evaluated synthetically by using 12 indexes,and could be classified into four different grades. The relationships between stand quality and some major factors such as crown density,elevation,and origin were also discussed in this paper. The results showed that elevation was a very important factor that influenced the stand quality,and the stand quality of natrural forest was higher than other forests. Moreover,some strategies on protection forest construction and stand quality optimization were put forward.