云南鸡足山元江栲群落和高山栲群落的群落多样性研究

The Study on Community Diversity of Both Castanopsis orthacantha and C delavayi Communities at Jizu Mountain,Yunnan

本文报告云南鸡足山元江栲群落和高山栲群落多样性的研究结果．群落多样性包括物种多样性和结构多样性．研究表明：①群落的物种多样性，元江栲群落低于高山栲群落；发育盛期群落低于过渡地段的或发育晚期的群落；高山栲群落随层次的升高指数降低，元江栲群落则以灌木层为最高、草本层较低．②结构多样性用考虑群落层次结构时物种多样性指数的增量来度量，元江栲群落高于高山栲群落；发育盛期群落高于过渡地段的或发育晚期的群落．③比较稳定的植物群落，其物种多样性指数较低，而结构多样性指数较高．

C orthacantha and C delavayi forests are the major types of semi humid evergreen broad leaved forests in the area of central Yunnan plateau.Their Community diversity is discussed in this paper. The results show that:①The species diversity index appears lower in C orthacantha community than in C delavayi community.The index is also lower in prime developing stage than in later stage or in transition zone.And the species diversity index drops when the layers go up in C delavayi community,but becomes higher in shrubs layer than herbs layer in C.orthacantha community.②The diversity of community consists of two parts.One is species diversity index,and the other is structure diversity index that can be measured by the increment of species diversity index when the distribution of species in layers has been considered.③With the community stability's rising,structure diversity index increase but species diversity index reduce.