Study on diversity of landscape trees in seminatural greenland in Yuxi.

The park greenland of 18 sites in urban districts of Yuxi including Hongta Park and Jiulong Park were investigated as typical sample plots to study the diversity of landscape trees in seminatural greenland in Yuxi.The plant species composition,richness index,dominance index,Shannon-Weiner index and evenness index in arbor ands hrub layers in these area were analyzed.Result showed 14 and 7 plants species were repetitiously used(the frequency 25 %) in Hongta Park and Jiulong Park.The Shannon-Weiner index of arbor and shrub layers was 3.7726 and 2.5095 in Hongta Park,4.2914 and 2.9312 in Jiulong Park.The evenness index of arbor layer was 0.0377 and 0.0248l,and the evenness index of shrub layer was 0.0998 and 0.0370.