四川缙云山森林群落林窗边缘效应的研究

 本文运用Shannon—Wiener物种多样性指数、Simpson生态优势度指标以及边缘效应强度指数，对缙云山亚热带森林群落林窗的边缘效应现象进行了初步研究。29个林窗样地不同部位上述指标的测定表明用物种多样性指数拟合边缘效应测度通式，缙云山亚热带森林群落林窗的边缘效应强度值为1—3左右；而用生态优势度值拟合边缘效应强度测式，则上述边缘效应强度值为0.1一1.2左右。研究表明林窗边缘区由于边缘效应的作用有增大物种多样性的趋势。而林窗面积、所处坡向以及林窗所在的森林群落类型，都对处于不同发育阶段的林窗的边缘效应强度具有影响。在此基础上，本文对林窗边缘效应强度的变化规律、效应性质、测定意义以及对森林营造和优化管理上的作用进行了一定探讨。

THE STUDY OF EDGE EFFECT OF THE FOREST COMMUNITIES IN JINYUN MOUNTAIN

This paper explores the characters of gap edge effect of the forest communities in Jinyun mountain. The species diversity and ecological dominance as well as the index of the edge effect of 29 forest gaps in Jinyun mountain are measured, on the basis of Shannon-Wiener index and Simpson index as well as the index of the edge effect. The results show that three indexes have an effect on explaining the gap edge effect in forest communities. Based on the measurement of the species diversity, the index of the gap edge effect in subtropical forest communities is about 1-3, and on the basis of the ecological dominance index, the former result is about 0.1-1.2, the results also show that the index of gap effect of forest communities is affected not only by its size, but also by its aspect and growing phase.The importance of gaps for regeneration of trees and maintenance of species diversity as well as the application of the gap edge effect on forestry practice are discussed.