Distribution Of The Invasive Plants In Different Road System In Tongan District, Xiamen City

As the "golden triangle" area in southern Fujian region,TongAn is the distribution center of industry and farming industry in economic special zones of Xiamen.With urbanization growing and the economic development,plants introduction and invasion are quickly spread.In order to effectively protect the TongAn native plants,the invasive plants species,sources and distributions in TongAn should be confirmed.The method of aliasing line and typical method of quadrant investigation was used.Our survey areas covered 11 towns or streets,and the research results through field investigation are as follows:(1)In TongAn district,there are 71 species(29 families and 57 genera)of invasive or potential invasive plants.The most dorminant invasive plants are 15 species of Compositae,8 Fabaceae species,7 kinds of Amaranthaceae and 6 Euphorbiaceae species,respectively.These top 4 families of invasive plants accounted for 50.1%in our survey.Tong ’an widespread invasive plants are Erigeron canadensis,Euphorbia hirta,Symphyotrichum subulatum,Amaranthus viridis,Ipomoea nil,Lantana camara,Sphagneticola trilob ata,Praxelis clematidea,Parthenium hysterophorus,Sida acuta,Bidens pilosa,Alternanthera philoxeroides and so on.(2)Different road system has different invasive plants.Acording to the analysis of single path,we can be concluded that:the most invasive plants exist in the national road(33 species)and account for 46.3%in all invasive species we surveyed;The provincial road is following by arrived at 22 species.The invasive plant species along the highway reached at average level(18 species).The invasive species along the county roads vary greatly,from 5 to 22.Based on the analysis of roads which are merged into the same magnitude,the results indicated that there are 29 species(26 genera and 13 families)of invasive plants along highway;31 kinds of invasive plant species(27 genera and 15 families)along national roads;21 species(11 families and 19 genera)of invasive plant species along provincial roads;and 41 invasive plant species(17 families and 36 genera)along county roads.(3)Clustering analysis,the invasive plants in different levels of road system,the possible route of invasive species is(national roads +highways)→ roads of province → county road.After invading into China different areas,the invasive plants spread different provinces along the national roads,then pervaded and built the populations along the highways,further then spread along the province roads.After that,the county roads should be used to spread the invasive plants and make the invasion plants grow in large scale.(4)Most of invasive plant species originated from North America(27 species),Following the South America consists of 12 species.There are total 39 species of plants from America invaded into TongAn,which covered 60%of invasive plants of TongAn district.Following by Asia(9 species)and Europe(8 species).Only 6 species from Africa and 3 species from Oceania.(5)In different biotope,invasive plant species richness ranked as follows:wholesale market of agricultural trade products>plant park>stone processing and industrial park>studio and farmland.Wholesale market of agricultural trade products and the park have more invasive species,25 species and 20 respectively,account for all invasive plant species of 35.2%,29.2%respectively.After this research,we concluded that TongAn district have ridiculous invasive plant species.Species of Compositae are maximum.Along the road system propagation characteristic is obvious.The results showed that America is the major origin for TongAn invasive plants,and it may be related to the frequent trade and similar climate and habitat between China and countries of America.In the future,to carry out the prevention and control of invasive plants,we should focus on invasive species which newborn in national roads and highway,early found early removed.For species which already spread in quarantine,divide-and-conquer method should be used.In the future,it should be paid more attentions to dealing with plants originated from the Americas when Importing plants species or carrying out quarantine work.