DISTRIBUTION CHARACTERISTICS OF AGERATINA ADENOPHORA (COMPOSITAE) ROOTS IN DIFFERENT INVADED AREAS
会议名称：《International Congress on Biological Invasions》
会议日期：2009年
摘 要：The Crofton weed Ageratina adenophora(Spreng.) King & Robinson is a global worst invasive weed,it rapidly became the dominant flora in the invaded areas,where it threatened the native biodiversity and ecosystem,and caused serious economic *** present paper investigated and compared the distribution of A. adenophora roots in newly,moderate and heavily invaded areas,the objective is to find the distribution characteristics of roots in different invaded areas of ***. The results showed that,the mean root length density(RLD) of *** increasing following with its invading *** with moderate and heavily invaded areas of ***,roots system in newly invaded area is obviously under developed,their mainly exist during 0-10cm depth soil,and the mean RLD in this area visibly less than the above two invaded areas(p0.01).RLD of A. adenophora in three invaded areas are all become few gradually following with the increasing distance from center of the samples,and root contents are distinctly differ in different horizontal distributions(P0.01).On the vertical distribution,roots of A. adenophora in three invaded areas are all mainly exist during 0-10cm depth,and the root content of 10-20cm depth in the newly invaded areas is evidently lower than that of moderate and heavily invaded areas.