馨香玉兰所在群落主要树种的种间联结性

Interspecific Associations of Main Tree Species in the Communities with Magnolia odoratissima

采用2×2列联表,通过X2检验和ω检验,并结合共同出现百分率(PC值)和联结系数(AC值),分析了馨香玉兰所在群落20个主要树种的种间联结性。结果表明,20个主要树种在总体水平上表现为显著的正联结。190对种对中,只有少数种对存在显著的相关性,大多数种对联结关系未达到显著水平,种对间相关性较弱。馨香玉兰种群与少数树种的种间联结性较强,与大部分树种间联结性较弱,体现了馨香玉兰较强的生态适应性。

Based on 2 × 2 contingency table and with X^2 and ω-tests, together with the percentage cooccurrence （PC） and the association coefficient （AC）, the interspecific associations of 20 dominant tree species in the communities with Magnolia odoratissima were studied. The results showed that 20 dominant tree species exhibited significantly positive association in general. Among 190 species pairs, only a few species pairs reached significant association, and most of species pairs didn＇t reach significant level, indicating that a relatively weak correlation existed among these species pairs. Between M. odoratissima and other tree species, most of species pairs were not significant association and a few were comparatively remarkable, reflecting stronger ecological adaptability of M. odoratissirna.