桂西南喀斯特区域群落主要环境因子及稳定性对飞机草入侵的影响

为揭示桂西南喀斯特区域群落主要环境因子及稳定性对飞机草（Eupatorium odoratum）入侵的影响，本文通过对群落生存状况、土壤环境因子的调查分析，研究群落的稳定性特征，探讨不同植物群落对外来入侵种飞机草生长扩散的影响。结果发现：植物群落内本地种盖度、群落高度等与飞机草的盖度和多度呈极显著的负相关关系，说明本地种的生长能对飞机草的入侵产生显著影响，其中光因子可能是影响飞机草生长的主导因子和限制因子；本地物种多样性对飞机草的盖度和多度影响也较显著，说明本地种多样性能有效抵御飞机草入侵；人为干扰对飞机草的盖度和多度则呈极显著的正相关关系，说明干扰能促进飞机草的入侵；土壤速效氮含量、土壤含水量、有机质含量和与飞机草的盖度和多度的关系均呈显著负相关关系，可能是由于群落内肥水充裕程度与调节飞机草生长的主导因子光水平呈负相关关系造成的。群落的稳定性与飞机草的盖度和多度呈极显著的相关关系，说明稳定性较高的群落更能有效的抵御飞机草的入侵，稳定性较低的群落更容易受到飞机草的入侵。

The effects of the main environmental factors, the community stability in karst region of southwest Guangxi on the invasion of Eupatorium odoratum

To reveal the effects of the main environmental factors and the habitat stability in karst region of Southwest Guangxi on the invasion of Eupatorium odoratum,the living conditions of communities and soil environmental factors were analyzed to study the stability characteristics of communities,and to explore the affection of different types of communities on the growth and spread of Eupatorium odoratum.The results show that: the factors such as coverage of local species,community height are significantly and...