Spatial Patterns of Floristic Composition of Invasive Alien Plants in Large Scale and Their Climatic Interpretation

The management and control of invasive alien plants are primarily based on the knowledge of their spatial patterns and the major factors.In this study,the spatial patterns of floristic composition of genus of invasive alien plants in China and their climatic interpretation were investigated based on information from literature and climate data.The results showed that tropical elements dominated the study area,followed by temperate elements and cosmopolitan elements,respectively.From south to north,there was a decreasing trend in the ratios of tropical elements,while an increasing trend was observed in the ratios of temperate elements.It indicated that in southern region,invasive alien plants mainly came from more tro-pical regions,while in northern region plants from temperate area gained the domination.Energy strongly shaped the spatial patterns of floristic composition.With the increase of mean annual temperature,tropical elements showed an increasing trend,while a decreasing trend was observed in temperate elements,which may be due to their different ecological characters.