缙云山风灾迹地恢复群落主要乔木树种种间联结性

Interspecific association of principal tree species in the restorable community of the wind-damaged slash in Junyun Mountain

关键词:  风灾迹地  种间联结  缙云山

Key words:  Wind-damaged slash  interspecific association  Jinyun Mountain

摘要:

应用方差比率法,并通过2×2列联表χ2检验法及利用联结系数AC指数测定法研究了缙云山自然保护区风灾迹地恢复群落自然恢复样地和人工恢复样地中主要乔木树种的种间联结性。结果表明:(1)自然恢复样地主要乔木种群间在总体上呈一定的正关联; 而人工恢复样地种群间在总体上呈负关联;(2)2×2列联表的χ2检验共有5个(3)种对为显著正关联(括号内为人工恢复群落的种对数,下同),2个(1)种对为显著负关联;(3)联结系数(AC)指数标量出了自然恢复和人工恢复样地中种对间的联结程度和相伴随出现的机率,两种恢复方式中的多数乔木种群间的联结性不显著且联结程度较低,绝大多数乔木树种之间无显著关联,而且人工恢复比自然恢复无关联性更强;(4)种对间的正关联,主要是由于它们具有相近的生物学特性以及对生境具有相似的生态适应性所致,种对间的负关联主要是由于物种间的空间排斥,适应不同的微环境的结果;(5)人工恢复和自然恢复所在的群落处于演替的不稳定阶段。

Abstract:

Interspecific association of principal tree species were studied,using variance ration method,χ2-test of 2×2 contingency table and association coefficient(AC). The study sited lies at the wind-damaged slash in Junyun Mountain,consists of a plot under natural condition and a plot under man-made restorable way. The results showed that:(1)overall relativity and interspecific association were definited positive association in the natural restorable plot,but were negative association in the man-made restorable plot;(2)the number of χ2-test of 2×2 contingency table were 5(3)species-pairs for χ2-test were significant and negative association of 2(1)species-pairs significant(The figure in brackets is species-pair in the man-made restorable plot);(3)association coefficient(AC)could be employed to show association degree of species-pair and the frequency of co-occurrence,the AC of majority of principal trees was comparatively low under the two restorable plots,and man-made restorable polt lower than that of under natural condition;(4)species pairs showed positive association had similar biological traits that made them ecologically adaptive for similar habitats,and that showed negative association occured spaces repelling and adapted different micro-habitat;(5)composition of the plant species and structure showed that both of the natural restorable and man-made communities were unstable stage of succession.