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Structure of the Phytoplankton Community and Its Relationship to Water Quality in donghu lake, Wuhan, China

Journal of Integrative Plant Biology 2005年第1期47卷 27-37页

作者： An-PingLEI Zhang-LiHU JianWANG Zhi-XinSHI Fung-YeeNoraTAM CollegeofLifeSciences ShenzhenUniversityShenzhen518060China InstituteofHydrobiology theChineseAcademyofSciencesWuhan430072China DepartmentofBiologyandChemistry CityUniversityofHongKongHongKongChina

: The phytoplankton community structure, in terms of species composition, total standing crop, and abundance of the dominant algal species, at four stations in donghu lake, Wuhan, China, was investigated monthly from January 1994 to December 1996. A total of 260 taxa was observed, of which Chlorophyta (106 taxa) contributed the highest portion of the total number of taxa, followed by Bacillariophyta (82 taxa) and Cyanophyta (32 taxa). The total standing crop measured by means of chlorophyll a content, cell density, and cell biovolume, as well as the abundance of the dominant species, declined in the order of Station I to Station IV. Seasonal changes of the standing crop varied greatly among the four stations. Although the cell density at the four stations showed a single peak within a year, the peak density varied from July to November, dependent on the sampling year and the station. For chlorophyll a content and cell biovolume, multiple peaks were observed at Stations I and II, but a single peak was found at Stations III and IV. The phytoplankton community structure indicated that the trophic status was the highest at Station I (most eutrophic), followed by Station II; Stations III and IV were the least trophic areas. The long-term changes in phytoplankton community structure further suggested that changes in phytoplankton community structure were correlated with water quality, and eutrophication of donghu lake had been aggravated since the 1950s.

关键词： dominant groups eutrophication donghu lake phytoplankton species composition standing crop

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Sequential fractionation of reactive phosphorus in the sediment of a shallow eutrophic lake——donghu lake, China

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Journal of Environmental Sciences 2000年第1期12卷 59-64页

作者： FU Yong-qing ZHOU Yi-yong LI Jian-qiu Institute of Hydrobiology Chinese Academy of SciencesWuhan 430072China

The bioavailability of phosphorus in lake sediment mainly depends on its forms. Therefore, reactive phosphorus (RP) pool of the sediment in a shallow eutrophic lake(donghu lake) was determined seasonally and spatially by sequential chemical extraction according to the scheme proposed by Psenner et al. (Psenner, 1985) and its modified version respectively. The ammonium chloride extracted 3%—7% of the total reactive phosphorus (Tot-RP), while the distilled water extracted less(<3%). These two forms of P were significantly higher at the most eutrophic stations(I and IV). The sum of BD-RP(reductant soluble P) and NaOH-RP extracted accounted for 57%—81% of Tot-RP, which could play significant roles in P cycling. The percentages of HCl-extractable RP in the sediments of station III, however, were usually much more than those of other stations, which could reflect the original geochemistrical characteristics and trophic status of the sediments. It was noted that the sediment RP in different fractions varied in different months studied.

关键词： donghu lake sediment reactive phosphorus sequential fractionation

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Phytoplanktonic desmids community in donghu lake, Wuhan, China

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Chinese Journal of Oceanology and Limnology 2005年第1期23卷 91-97页

作者：魏印心俞敏娟 Institute of Hydrobiology Chinese Academy of Sciences Wuhan 430072 China

For compilation and comparison of desmids flora, the authors restudied the species composition, cell density and biomass of phytoplankton desmids collected at six stations in donghu lake at intervals of three months monitored from March of 1956 to February of 1957. A total of 122 taxa belonging to 16 genera were identified from qualitative and quantitative samples. Species of Cosmarium were the most popular ones occupy- ing about 41 % of the total species. Based on the observations, the annual mean values of the cell density and biomass were 132.11×102 cells/L and 0.09 mg/L. Cosmarium, Staurastrum, Staurodesmus and Closterium dominated and contributed more than 70 % of the total cell density and biomass at six stations in four seasons. The maximum species number, cell density and biomass in autumn revealed that the highest variety (64 taxa, 1296×102 cells/L and 0.889 mg/L respectively) occurred at Station 3 located in the southern part of donghu lake. From then on to the mid 1990s the desmids community decreased sharply in donghu lake, resulted clearly from eutrophication in the lake.

关键词： phytoplanktonic desmids species composition cell density seasonal fluctuation donghu lake

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SEASONAL CHANGES OF DISSOLVED AND PARTICULATE ORGANIC CARBON IN donghu lake,CHINA

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Chinese Journal of Oceanology and Limnology 2000年第4期18卷 372-377页

作者：刘学君徐小清谢平 Noriko Takamura Institute of Hydrobiology Chinese Academy of SciencesWuhan 430072China National Institute for Environmental Studies 16-2 OnogawaTsukuba 305IbarakiJapan

Concentrations of dissolved and particulate organic carbon (DOC and POC) were documented in 1996-1997 at 4 different trophic state stations in donghu lake, a typical shallow eutrophic lake along the Changjiang River’s middle reaches. The mean concentrations of DOC were 15.11±3.26, 15.19±4.24, 14.27±3.43, and 13.31±3.30 mg/L in Station I, II, III, and IV, respectively. The DOC concentrations of the studied area were very similar to that in other lakes along the Changjiang River’s middle reaches. The POC mean of the whole lake was 5.01 mg/L due to the large amount of organic detritus of both allochthonous and autochthonous origin. Significant linear relationship was found between POC and chlorophyll a at all 4 stations, which presumably reflect that phytoplankton, its exudates and its metabolic products were the main contributors to the POC pool in the water column. The slope of such linear relationship at Station IV was significantly steeper than that at Station I, II and III. In addition, the DOC/POC ratios (mean value: 4.40) indicated that the organic detritus was the most important component of the particulate organic matter; in other words, next to organic detritus, phytoplankton dominated the particulate organic matter in donghu lake.

关键词： dissolved organic carbon particulate organic carbon carbon constituents carbon cycling donghu lake

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New desmids material from donghu lake,Wuhan,China

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Chinese Journal of Oceanology and Limnology 2005年第2期23卷 210-217页

作者：魏印心俞敏娟 Institute of Hydrobiology Academia Sinica Wuhan 430072 China

This paper reports two new species, one new variety and fourteen taxa new to China in three genera of the phytoplankton desmids from donghu lake, Wuhan, China.

关键词： phytoplanktonic desmids Cosmarium Staurastrum Staurodesmus donghu lake

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Hydrodynamic effects of reconnecting lake group with Yangtze River in China

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Water Science and Engineering 2011年第4期4卷 405-420页

作者： Ling KANG Xiao-ming GUO School of Hydropower and Information Engineering Huazhong University of Science and Technology Wuhan 430074 P. R. China

The hydrodynamic effects of reconnecting a lake group with the Yangtze River were simulated using a three-dimensional hydrodynamic model. The model was calibrated and validated using the measured water temperature and total phosphorous. The circulation patterns, water temperature, and water exchange conditions between sub-lakes were simulated under two conditions：（1） the present condition, in which the lake group is isolated from the Yangtze River; and （2） the future condition, with a proposed improvement in which connecting the lake group with the Yangtze River will allow river water to be diverted into the lake group. The simulation period selected was characterized by extremely high temperature and very little rain. The results show that the cold inflow from the river has a significant effect on the water temperature only near the inlets, and the effect is more obvious in the lower water layers than that in the upper ones. The circulation pattern changes significantly and small-scale vortices only exist in part of the lake regions. The water exchange between sub-lakes is greatly enhanced with the proposed improvement. The water replacement rate increases with water diversion but varies in different sub-lakes. Finally, a new water diversion scheme was proposed to avoid contamination of some lakes in the early stage.

关键词： hydrodynamic model lake group donghu lake Yangtze River

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