A Study On Seed Dispersal By Wind Of Solidago Canadensis And Its Suitability Analysis

More and more studies show that invasion of alien plants has caused severe impacts on native biodiversity.Solidago canadensis is a kind of alien invasive species,it has caused caused serious harm to nature environments and biodiversity in china.The purpose of the pre sent study is to investigate the dispersal mechanisms underling its successful invasion, and try to find some effective ways for its control.We compared morphology,settlement velocity and dispersal distance of five weed species which are Solidago canadensis,Aster tataricus,Conyza canadensis,Phragmites communis and Lagedium sibiricum,and predict the potential distribution area ofSolidago canadensis.The results are:1.The order of five weed species' thousand grain weight is Phragmites communis＞Lagedium sibiricum＞Solidago canadensis＞Aster tataricus＞Conyza canadensis.2.The order of five weed species' pappus diameter is Phragmites communis＞Lagedium sibiricum＞Solidago canadensis＞Aster tataricus＞Conyza canadensis.3.The order of five weed species' Settlement velocity is Lagedium sibiricum＞Phragmites communis＞Conyza canadensis＞Aster tataricus＞Solidago canadensis.Results indicated that the settlement velocity of five species were 14.1 cm·s^-1,20.4 cm.s^-1,20.8 cm.s^-1,23.3 cm.s^-1,33.3 cm.s^-1,respectively.Comparing with other species,Solidago canadensis has the slowest settlement velocity.4.Diaspore settlement velocity increases linearly with the square root of plume loading.5.The controlled-environment experiments predicted a lesser mean dispersal distance than the mechanistic model,with large disparities between maximum dispersal distances.6.Based on the GARP model system,the potential distribution of Solidago canadensis in china were analyzed.The result indicates that S.Canadensis could occur in the most areas of china.