Biodiversity Science ›› 2011, Vol. 19 ›› Issue (4): 424-431.doi: 10.3724/SP.J.1003.2011.08325

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Effects of disturbance, topography, and soil conditions on the distribution of invasive plants in Wenzhou

Mo Gao1, 2, Renyong Hu2, Xianxing Chen2, Weicheng Li3, Bingyang Ding2*   

  1. 1Department of Biology, College of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou 310036

    2Department of Biology, College of Life and Environmental Sciences, Wenzhou University, Wenzhou 325035

    3China National Bamboo Research Center, Hangzhou 310012
  • Received:2010-12-28 Revised:2011-03-09 Online:2011-07-29
  • Bingyang Ding E-mail:dby@wzu.edu.cn

In order to understand factors regulating the distribution of invasive plants in Wenzhou, we used route-checking and fixed-plot sampling to evaluate the distribution of invasive species and associated agro-type, topographical and anthropological factors. Relationships between the distribution of invasive plants and the environmental factors were assessed using canonical correspondence analysis (CCA). Analysis of vari-ance was used to test for differences in species composition and abundances of the invasive plants among different parts of the region, and to explore the major factors responsible for the differences. Our investiga-tions showed: (1) 64 invasive plant species from 28 families and 51 genera were found in Wenzhou. More than 70% of those species were either annual or biennial dicotyledonous, and 68.8% of them were of Ameri-can origin. (2) The number of invasive plant species differed among the 11 investigated counties of the re-gion, among which Yueqing County had the highest number of species (51 spp.), followed by Cangnan (43 spp.), while Dongtou had the fewest (27 spp.). (3) The distribution of exotic invasive plants in Wenzhou was most affected by traffic frequency, the degree of settlement, and landform type. (4) The distribution of com-mon eurychoric species was not affected strongly by any single environmental factor. The distribution of rare species with limited distributions, however, was affected significantly by both traffic frequency and landform; (5) Human activities played an important role during the initial stage of the invasion for the success-fully invaded plants. Environmental factors were critical to the invading plants during the establishment stage of the invasion, while their biological characteristics had the major effect on their successful spread and on the extent of the damage they would cause in the areas they invaded.

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