城市公园中水蕨的新发现及其群落物种多样性分析

目的]调查笔架山公园中新发现长势良好的国家Ⅱ级保护植物水蕨群落的物种多样性。方法]通过样方调查研究笔架山公园中新发现水蕨群落的生境和物种多样性。结果]样方内物种数共15种,隶属11科15属。重要值排名前5位的分别为草龙(27.35)、狗牙根(15.69)、水竹叶(14.09)、金钮扣(8.03)和水蕨(5.96),水蕨在整体群落中并不占据优势;此外,该水蕨群落出现3种藤本植物。Simpson指数(D)为0.917,Shannon-Wiener指数(H)为2.735,Pielou指数分别为0.883和0.917,均高于其他区域的典型群落。结论]建议对该群落定点保护,并清除已有入侵物种薇甘菊和圆叶牵牛。

Discovery and Community Diversity of Ceratopteris thalictroides in Urban Parks

Objective] To investigate the species diversity of a community of Ceratopteris thalictroides(belonging to national II level protected plants)with good growth vigor discovered in Bijiashan Park.Method] The habitat and species diversity of C.thalictroides discovered in Bijiashan Park were studied by using sample plot investigation.Result] There were 15 species belonging to 15 genera, 11 families in the community.The top 5 species from the aspect of important value were Ludwigia hyssopifolia (27.35), Cynodon dactylon (15.69), Murdannia triquetra(14.09), Spilanthes paniculata(8.03) and Ceratopteris thalictroides (5.96).C.thalictroides didn't take advantage role in the whole community.And three species of liana plants were also found.Simpson index (D) was 0.917, Shannon-Wiener index (H) was 2.735.Pielou index were 0.883 and 0.917 respectively, which were all higher than those of typical communities in other regions.Conclusion] The fixed protection of this community should be suggested, and the invasive species Mikania micrantha and Pharbitis purpurea should be removed immediately.