A PRELIMINARY ANALYSIS OF THE LAST TWENTY YEAR BIRD COMMUNITY CHANGES IN THE TIANMU SHAN
二十年来天目山鸟类群落结构变化趋势的初步分析

Bird communities are very sensitive to environmental changes, The changes in vegetation will rapidly lead to a change in the composition of bird communities. For comparing the changes of common species in bird communities in the Tianmou shan area for the last twenty years, observations were carried out from 1979-1980, The index of species diversity was described with community information principle of Shannon-Wiener and the calculation was carried out with the formula of diversity index of Pielou E. C.Table...