Distribution Characteristics of Ageratina adenophora (Compositae) Roots in Different Invaded Areas
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 losses. The distribution of A. adenophora roots in newly,moderately and heavily invaded areas to find the distribution characteristics of roots in different invaded areas of A. adenophora. The results showed that,the mean root length density (RLD) of A. adenophora increased with its invading progress. Compared with moderate and heavily invaded areas of A. adenophora,roots system in newly invaded area is obviously under development,their mainly exist during 0-10 cm depth soil,and the mean RLD in this area was visibly less than that in the above two invaded areas (P＜0.01). RLD of A. adenophora in three invaded areas all became few gradually with the increasing distance from center of the samples,and root contents distinctly differ in different horizontal distributions (P<0.01). In the vertical distribution,roots of A. adenophora in three invaded areas all mainly exist during 0-10 cm depth,and the root content of 10-20 cm depth in the newly invaded areas was evidently lower than that of moderate and heavily invaded areas.
NETL
NSTL
万方数据
维普
