梁子湖湿地植物多样性现状与评价

根据1999～2001年的野外调查数据,研究了湖北梁子湖湿地浮游藻类和高等植物多样性资源.结果表明,该湿地常见浮游藻类73种,隶属于7门58属(绿藻28种,硅藻19种,蓝藻14种,金藻4种,裸藻3种,甲藻3种,隐藻2种);高等植物282种,隶属于72科183属(苔藓8种,蕨类9种,裸子植物3种,被子植物262种),其中国家重点保护野生植物5种.浮游藻类密度和生物量均值分别为(1163.79913.51)104cell/L和6.1342.737mg/L,叶绿素a含量12.754.98mg/L,浮游藻类表层日生产量1.18～2.29mgO2/(Ld).水生植被繁茂,可划分为12个群丛,群丛单位面积生物量为6.443kg/m_{2;水生植被覆盖率54.27%,单位面积生物量为3.496kg/m2,在同类湖泊中处于中等水平;植被种类复杂,以沉水植物微齿眼子菜(Potamogeton maackianus)和金鱼藻(Ceratophyllum demersum)为优势群落.该湖泊总体上属中营养型水体,仍保持草型湖状态.}

The present situation and evaluation of plant diversity of Lake Liangzihu wetland

Based on the field data investigated during 1999~2001, the planktonic alga and higher plant diversity resources of Lake Liangzihu wetland in Hubei Province were studied. The wetland was quite rich in plant diversity, with 73 common planktonic alga species (including 28 species of Chlorophyta, 19 species of Bacillariophyta, 14 species of Cyanophyta, 4 species of Chrysophyta, 3 species of Euglenophyta, 3 species of Pyrrophyta and 2 species of Cryptophyta) belonging to 7 phyla and 58 genera; as well as 282 common higher plant species (including 8 species of Bryophyta, 9 species of Pteridophyta, 3 species of Gymnospermae and 262 species of Angiospermae) belonging to 72 families and 183 genera. Among the higher plants, there were 5 national key protected species. Of the planktonic alga, the average values of density and biomass, were (1163.79913.51)104cell/L and 6.1342.737mg/L respectively; chlorophyll a content was 12.754.98mg/L and surface daily production rate of planktonic alga was 1.18~2.29mgO2/(Ld). The aquatic vegetation was luxuriant which can be classified into 12 associations, the association biomass in unit area was 6.443kg/m2; the aquatic vegetation covering rate was 54.27%, biomass in unit area was 3.496kg/m2, being of middle level among the similar lakes. Species composing the aquatic vegetation were complex with submersed plant Potamogeton maackianus and Ceratophyllum demersum as dominant species. The lake belongs to mesotrophic waters and is still a macrophytic lake.