云南鸡足山元江栲群落和高山栲群落的植物种间结合研究

STUDIES ON INTERSPECIFIC ASSOCIATION OF BOTH Castanopsis orthacantha AND Castanopsis delavayi COMMUNITIES AT JIZU MOUNTAIN,YUNNAN PROVINCE

报告云南鸡足山半湿润常绿阔叶林元江栲群落和高山栲群落植物种间结合的研究结果。测定了两类群落共６３种植物按层次组成的６８２个种对的种间结合，获得有相关性的种对２１５个（正相关１５４个，负相关６１个）。结果表明：１）群落各有自己的基本组成种类，同一群落的种间互为正相关，不同群落的种间为负相关。２）不同层次植物种间的相关性显著水平不同，高显著水平的种类大多处于乔木层。３）发育盛期群落中极少有或没有负相关的种类，发育晚期群落中有一定数量的负相关种对；过渡地段的群落中负相关的种对较多。４）作者改进的联结系数模型Ａｉ兼有定量、定性两类模型的优点；作为植物种的重要性指标，广义多度较个体数更为合理。

Castanopsis orthacantha and Castanopsis delavayi forests are the major types of semi humid evergreen broadleaved forest in the area of central Yunnan plateau.The paper discusses the interspecific association of the two communities at Jizu Mountain of Yunnan Province.In the study,there are 215 species pairs correlations expressed in 682 pairs mated by 17 tree species,15 shrubs and 29 herbs.The result shows that :1)The species expressed a positive correlation in the same community,and a negative correlation in the different communities.Four species showed the high positive significant correlation in the Castanopsis orthacantha community,and the other 4 species in Castanopsis delavayi community.2) The level of correlation significance varied at different layers.There are more pairs of high level correlation in tree layer than in shrubs or herbs.3)The numbers varied in pairs of positive and negative correlation of community at different stages or in different habitat.No pairs of negative correlation existed in prime stage,while the pair number of positive correlation and non correlation was roughly equal.However,in the later stage the pairs of positive correlation and non correlation decreased and negative correlations appeared.In the transition zone,negative correlation pairs increased and surpassed in number either of the positive correlations 4) The association index model Ai has advantages of both the qualitative and quantitative model,which can both eliminate the higher values in qualitative models,and reduce data collecting work in quantitative models.As the index of value of species,the generalized abundance is more rationale than the number.