紫茎泽兰入侵对哀牢山森林植物物种多样性的影响

Effects of Invasion of Ageratina adenophora on the Species Diversity of Forest Plants in Ailao Mountains

为了解紫茎泽兰(Ageratina adenophora)入侵对哀牢山森林群落物种多样性的影响,对哀牢山紫茎泽兰入侵森林进行了植物群落调查和多样性分析。乔木层的盖度、物种丰度以及灌木层盖度均与紫茎泽兰平均株高呈显著负相关。物种多样性指数和均匀度指数随紫茎泽兰入侵重要值的增加而减少。紫茎泽兰入侵对群落整体水平上生物多样性的负效应在灌木层最高,其次是草本层。当紫茎泽兰重要值小于0.327,乡土植物多样性指数和均匀度指数都随紫茎泽兰重要值的增加而增加,而重要值大于0.327时,各项指数都随重要值的增加而减小,结果表明:紫茎泽兰的入侵影响乡土植物群落物种多样性,并产生正向与负向的影响,当入侵量达到一定的阈值时,将导致乡土植物物种多样性下降。

In order to understand the impact of Ageratina adenophora invasion on the species diversity of forest communities in Ailao Mountains,this study carried out plant community investigation and diversity analysis of Ageratina adenophora invasive forests in Ailao Mountains.Coverage of tree layer,species abundance and coverage of shrub layer were significantly negatively correlated with the average plant height of Ageratina adenophora.Species diversity index and evenness index decreased with the increase of Ageratina adenophora invasion importance value.The negative effect of Ageratina adenophora invasion on the overall biodiversity of the community was highest in the shrub layer,followed by the herb layer.When the important value of Ageratina adenophora was less than 0.327,the native plant diversity index and evenness index both increase with the increase of the important value of Ageratina adenophora,and when the important value is greater than 0.327,each index decreases with the increase of the important value.The results indicated that the invasion of Ageratina adenophora affected the species diversity of native plant communities,and had positive and negative impacts.When the invasion amount reached a certain threshold,it would lead to a decline in the species diversity of native plants.