关键词: 群落结构, 蒙古栎, 次生林, 优势树种, 空间分布格局

Abstract: Under the background of global economic integration and ever-increasing international trade, biosecurity incurred by the invasion of alien species may threaten ecosystem sustainability. Through field investigation and literature reviews, we analyzed the floristic composition, genus composition, geographical composition, origins, life forms and reproductive characteristics of the invasive species in Jiangsu Province. The results showed that there are 229 invasive species, belonging to 140 genera and 51 families. For angiosperm, there are 227 species in total from 138 genera in 49 families, which are dominated by monocotyledon. In the perspective of the composition of families and genera, large families, singlespecies genera and oligospecies genera composed the main body of the flora, but larger genera have higher abundance at the level of the species, indicating that the internal structure of the invasive flora in Jiangsu Province is complex. Furthermore, the invasive flora of Jiangsu Province has a strong tropical affinity and is largely influenced by temperate flora. Most of invasive species are from the Americas and dominated by herbaceous species. 49.56% of the invasive species are propagated with small flowers and short flowering period. The main fruit type of invasive species is capsule, which is beneficial to seed dispersal. Most invasive species are mainly seed propagation. 28.82% of the invasive species have both seed and clonal propagation, with the latter being the main way that is beneficial to improving its invasion ability.

Key words: spatial distribution pattern., Quercus mongolica, secondary forest, dominant species, community structure