Plant Diversity And Summer Temperature-humidity Effect Of Communities In Parks In Haitan Island

Based on an overall investigation,the a and ? plant diversity of 5 parks in Haitan island were determined and analyzed to explore the factors that have significant influence on plant diversityof the off-shore parks and shore parks.11 sample plots were selected by quardat sampling method to determine the relationship between the structure of plant communities and temperature-humidity effect during summer period from July to September.The result show that Firstly,89 families,208 genera and 276 species were recognized,including 146 species of wild plants and 131 species of landscape plants.Some plants such as Ginkgo biloba,Glehnia littoralis were planted in the parks for protection and landscape use.118 species exotic plants were recognized,including 26 species introduced from domestic region and 92 species introduced from foreign region.Some of the exotic plants can modify habitat.38.04%of exotic plants which was from foreign region were invasive plants that existed at least 10 species in every parks.Dominant families were Asteraceae,Fabaceae,Euphorbiaceae.The family containing 2-4 species accounts for a larger proportion.Dominant genus is Ficus and monotypic genus takes a lagest proportion.The distribution of flora is more complicated after introducing the exotic plants which mostly was from tropical zone.The plant diversity of seashore parks was lower than that of offshore parks because of the difference between the biotope and landscape design,which will improve ? diversity.Severe condition caused the low plant diversity in seashore parks.Five parks lack endemic plants in green space.Furthermore,the homogenization of species was high.Secondly,We found the difference of 18 tree species of plant community in monitoring the temperature and humidity by CCA(Canonical correspondence analysis)analysis.However,the characteristic of plant communities would cover specific difference.The result of stepwise regression analysis that solar radiation,wind speed,the crown area,the height,shannon-wiener diversity of trees layers in plant communities have a significance influence to temperature-humidity effect.The solar radiation and wind speed are the major contributiors to temperature-humidity effect.Citizens feel discomfortable because of high temperature.Thirdly,From the weight value of the criterion layer,We found people pay more attention to ecological function rather than cultural society and landscape function.Health,security and comfort were considered as keypoint of plant community construction.Finally,we put forward to some proposals for screening ornamental plants,managing exotic plants and modifying habitat.