千岛湖马尾松群落种群生态位与种间联结

Niche and Interspecific Association of Species of Pinus massoniana Communities in Qiandao Lake

在对千岛湖马尾松(Pinus massoniana)群落野外调查基础上,采用生态位宽度、生态位重叠和基于2×2联列表的x2检验、联结系数及共同出现百分率的方法,分析了群落主要种群间的相互关系。结果表明:群落中马尾松的生态位宽度最大,杉木的生态位宽度最小,生态位较大的物种间生态位重叠值也较高,马尾松与黄檀之间的生态位重叠值要明显高于其他种群的,Schoener指数为0.750 3。马尾松与其他种群之间的联结性较显著,而且多数为正联结。种间正联结性越强,其对环境要求越接近,生态位重叠值越大。结合联结系数及共同出现百分率指标对其种间联结性的程度测定显示:各项指标对马尾松群落主要种群之间联结性关系总体上反映了大致相同的结果,但不同的测定方法可以相互弥补由于单一方法分析的不足。

Field data collection was based on 5 plots （30mx30m） in Pinus massoniana communities distributed in Qiandao lake, Zhejiang province Methods including niche breadth, niche overlap, x2-test, association coefficient（AC） and percentage co-occurrence （PC） based on 2x2 contingency table were used for analyzing the interaction between the species population. The niche breadth of P. massoniana was the largest, while that of Cunninghamia lanceolata was the smallest. Simultaneously, niche overlap increased with niche breadth. The niche overlap of species pairs of between P. rnassoniana and Dalbergia hupeana was larger than species pairs between P. massoniana and other populations. The Schoener index was 0.7503. The inter-specific associations between P and other species were comparatively significant, and mostly were of positive. The more intense the positive association, the more similar the environmental demand required, and the larger the value of niche overlap was. The degree of inter-species association based on x2-test, together with the association coefficient and percentage co-occurrence, showed that the indices applied could reflect the approximately same results, and multiple indices could remedy the insufficiency analyzed by a single index.