广东内伶仃岛薇甘菊危害与生态因子的关联度分析

Analysis of the relationship between the damage of Mikania micrantha and ecological factors in Neilingding Island, Guangdong Province, China

用灰色关联度分析对广东内伶仃岛草本群落、草灌(或灌草)丛群落和灌木林受薇甘菊危害与环境因子的关联性进行分析。结果表明薇甘菊对草本群落的危害与环境因子的关联度中主要受土壤水分和电导率的影响较大,对草灌丛群落的危害与各环境因子的关联度差异不大,但其中受土壤含水量、pH值和群落透光度的影响稍大些,对灌丛群落的危害与各环境因子的关联度差异也不大,其中受土壤有机质、群落透光度和土壤含水量的影响较大。各环境因子对不同群落受薇甘菊危害的影响由强到弱的顺序为土壤含水量>土壤pH值、有机质含量>群落透光度、土壤养分。

By the relatedness degree of the gray system theory,the relatedness degree between the damages caused by Mikania micrantha H.B.K.to herbaceous community,herbaceous scrub community and shrub community in Guangdong Neilingding Island and the ecological factors was analyzed.The results show that the correlated degree of damages of M.micrantha to herbaceous community and environmental factors is mainly affected by the water content of soil and conductivity.On the other hand,the correlated degree of damages of M.micrantha to herbaceous scrub community and each environmental factor is not significantly different,but it is mainly affected by water content of soil,pH of soil and transparence of communities.There is also no significant difference in the correlated degree between the damages of M.micrantha to shrub community and environmental factors,but it is mainly affected by organic matter content of soil,transparence of communities and water content of soil.The sequence of the effect of all environmental factors on the damage of different communities can be listed as water content〉pH and organic matter content〉 transparence of communities and soil nutrients.