Adaptivity of Major Terrestrial Invasive Plants in Different Habitats in Hainan Province

Key words: 
• terrestrial invasive plants /
• MaxEnt /
• habitat types /
• environmental factors

Abstract: Environmental data and the data of the invasive plants from field sampling were analyzed by using Max Ent and Arc GIS to predict the distributions of suitable adaptivity areas for six major invasive plants,Chromolaena odorata,Praxelis clematidea,Mimosa pudica,Conyza sumatrensis,Wedelia trilobata,Lantana camara,in Hainan Province,China. Results showed that the adaptivity of the 6 major invasive plants tended to decrease gradually from coastal areas to inland areas,which might be due to difference in climatic distribution,to high elevation,or to the change of landuse types. Jackknife analysis showed that land use types were highly associated with the area of the suitable habitats of the invasive plants and were hence the most important environmental factors affecting the distribution of the six terrestrial invasive plants. Moreover,the area of suitable habitats of different invasive plants is also influenced by elevation,slope aspect,annual range of temperature,and seasonal variation of rainfall. Further analysis using Jackknife method also showed that the adaptivity of the 6 invasive plants was very high in the habitats of the surroundings of the village,the urban construction land and other construction lands like those in salt mine,industrial area,factories,mills,stoneworks,and higher in the habitats of woodland and grassland,but rather weak in the forested land（natural or artificial forests with canopy closure of ＞ 30%） and grassland with high vegetation coverage（Natural grassland,improved grassland and cut-and-carry grassland with a vegetation coverage of ＞ 50%）.