武汉东湖主要湖区的藻类与营养型评价

对东湖９个湖区藻类的群落结构、生长潜力、初级生产力和营养状况进行了比较研究。结果表明，９个湖区藻类的种类组成无明显差异，绿藻为主，蓝藻和硅藻次之；藻类的生长潜力和初级生产力各湖区差异较大，均以茶港湾重污染区最高和牛巢湖最低。根据各项指标综合分析，９个湖区水质优劣的顺序是：牛巢湖、汤林湖、后湖、郭郑湖、菱角湖、筲箕湖、庙湖、喻家湖和茶港湾重污染区。对东湖的大水面郭郑湖４０年来藻类的有关参数进行比较发

Algae and trophic status of Donghu Lake (Wuhan) with reference to their changes during the past 40 years

Donghu Lake, located at the northeastern part of Wuhan city, is a shallow lake with an area of 32km2. It is a hyper-eutrophic lake polluted by domestic sewage and industrial waste. The community structure, growth potential (AGP), cell density, chlorophyll.a and primary production of algae in nine areas of the lake were investigated in 1991~1993. Green algae is the most important component and blue-green algae as well as diatoms are subdominant groups in the lake areas. The dense bloom of blue-green algae has vanished since 1985. The maximum AGP and primary production were found in Chagang area and the minimum in Niuchaohu area. According to the parameters concerning trophic level obtained in this study, the descending order of water quality of the nine lake areas is Niuchaohu area, Tanglinghu area, Houhu area, Guozhenghu area, Lingjiaohu area, Shaojihu area, Miaohu area, Yujiahu area and Chagang area. As compared with the algal data from Guozhenghu area (a typical sublake) after the 1950s, the decadal peak value of algal individuals increased over one hundred times in the past 40 years. However, the genera of algae in the sublake were reduced by 54% during the same period. The results clearly demonstrate that the eutrophication of Donghu Lake has not yet been controlled. The features of degenerated lake ecosystem are quite obvious in this lake.