Prediction Of Spatial Distribution Of Two Species Of Ambrosia L.based On Information Technology

Ambrosia artemisiifolia L.,annual herb,a species of Ambrosia L.genus of Compositae;Ambrosia trifida L.is another species of Ambrosia.Ambrosia is an active genus on evolution,with a certain invasive character.Recently,A.artemisiifolia and A.trifida have invaded in large areas of China,which have been influenced the production of agriculture severely even endangered the health of mankind.Therefore,the two speices of Ambrosia were listed in the List of Alien Invasive Species of China.The paper aims to imperfect Maxent analysis method of predicting species distribution.Previous relevant articles of research on model prediction mainly focused on the result and application of model,researches on this direction are few.This study proformed the predication of spatial distribution patterns of A.artemisiifolia and A.trifida,by combining Internet and information technologies such as Maxent model and GIS,which can save lots of time and energy in data collection in the preliminary stage and visualization of optimizing data information.main research results are indicated as follows:(1)It can be seen from spatial distribution pattern changes of two plant species and the invasion route map,A.artemisiifolia formed an early distribution center in Jiangxi,Jiangsu,Hubei and Liaoning,which covered and influenced ten neighboring provinces.In the past ten years,the distribution center enlarged gradually,and the center shifted from Northern China to Southern China.As a result,three provinces such Guangdong,Fujian,and Hunan have been new reproductive aggregation points of A.artemisiifolia in the southern China.However,the distribution pattern of Ambrosia trifida is really different from A.artemisiifolia.In 2015,A.trifida mainly grew in northeast China,Northern China and East China,and spread around areas,such as Beijing,Jilin,Inner Mongolia,Shanxi,Jiangxi,Zhejiang,Hunan,Anhui,Guangdong and so on.(2)Maxent model was adopted to predict the potential distribution normal region of A.artemisiifolia and A.trifida in this paper.The result indicated that there are three kinds of habitat areas for A.artemisiifolia in China.The high suitable habitat areas covered 5.19×10~5km~2,accounting for 5.41%of total land area of China;and the medium suitable habitat areas covered 8.63×10~5 km~2,accounting for 8.99%of total land area of China;and the low suitable habitat areas covered 9.31×10~5 km~2,accounting for 9.70%of total land area of China.In sum,the covering ratio of high,medium and low suitable habitat areas for Ambrosia trifida are 3.15%,12.82%and 9.86%of total land area of China respectively.(3)From the results of the potential distribution habitat areas of A.artemisiifolia,the low potential breeding area of A.artemisiifolia was similar to its present spatial distribution;and the high potential habitat of A.artemisiifolia also coincides with its current distribution center,including Guangzhou Guangdong,Nanchang Jiangxi,Wuhan Hubei,Shenyang Liaoning and Beijing.However,the current distribution center of Ambrosia trifida is mainly concentrated in the high and medium suitable habitat areas as predicted.In addition,the results about the receiver–operator characteristic(AUC)values of two species'model are both more than 0.9,which means that the prediction effect of this model is relatively perfect.