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研究了不同扩张强度下毛竹和肿节少穗竹对江西武夷山常绿阔叶林群落结构和物种多样性的影响.结果表明:毛竹、肿节少穗竹扩张都会不同程度地改变阔叶林群落结构与物种组成,两者同时高强度扩张时(毛竹30～50 ind·100 m~(-2),肿节少穗竹300～500 ind·100m~(-2)),群落的乔∶灌(密度比)由2∶8变成1∶9,竹∶木(密度比)由0∶10变成9∶1.毛竹、肿节少穗竹扩张对阔叶林物种多样性影响的主效应显著,毛竹主要影响乔木层,肿节少穗竹主要影响灌木层,但两种竹子的交互作用不显著.两种竹子同时扩张对群落生物多样性的影响存在叠加效应,尤其是高强度扩张使群落Shannon指数下降91.3%.毛竹与肿节少穗竹同时低强度扩张时,两者相互影响不大,但当达到一定密度后两者会相互竞争排斥.这表明,当常绿阔叶林同时遭受毛竹、肿节少穗竹扩张时,虽然二者交互作用不明显,但会通过叠加效应影响木本植物,导致阔叶林群落简单化.
The effects of different expansion intensities on the community structure and species diversity of evergreen broad-leaved forests in Wuyishan of Jiangxi Province were studied under different expansion intensities. The results showed that the expansion of bamboo and swollen sparse bamboo would change the broad-leaved forest communities to varying degrees The structure and species composition of the two plants were high at 30 ~ 50 ind · 100 m -2 and 300 ~ 500 ind · 100 m -2 respectively at the same time. (Density ratio) from 2: 8 to 1: 9, bamboo: wood (density ratio) from 0:10 to 9: 1.Main effects of bamboo and swollen sparse bamboo spruce on the species diversity of broad-leaved forest Significantly, Moso bamboo mainly affects the arbor layer, and the echinoderms less affected the shrub layer, but the interaction between the two bamboo species is insignificant. The effect of simultaneous expansion of two bamboo species on the community biodiversity is superposed, especially the high-intensity expansion The Shannon index of the community decreased by 91.3% .While the bamboo and the swollen sparse bamboo at the same time low-intensity expansion, the two have little effect on each other, but when a certain density of the two will compete with each other exclusion .This shows that when the evergreen broad-leaved forest at the same time Suffer from bamboo, swollen less spike bamboo expansion, although the interaction between the two is not obvious, but through the stack Effect affect woody plants, resulting in broad-leaved forest community simplistic.