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Inhibitory effects of macrophytes on the growth of algal community in Landscape water of Hefei city were evaluated. In the coexistence culture system of different macrophytes species (Ceratopteris siliquosa, Echinodorus opticus, Elodea densa, Limnophila aquatica, Myriophyllum aquaticum, Najas Guadalupesis, Nesaea crassicaulis and Rotala wallichiii) and nature algal community, only the macrophytes...
To uncover the biotic influence of the internal phosphorus release in the sediment of Lake Xuanwu, colony-counting method of flat-panel culture was used to analysis the amount and categories of phosphorus-degrading microorganism. The result showed that there were phosphorus-degrading microorganisms in the sediments of the Lake Xuanwu and most them were inorganic phosphorus-degrading microorganisms,...
The acute toxicity of herbicide atrazine to a species of green algae Scenedesmus obliquus, a species colorless heterotrophic flagellate Bodo saltans and two species of ciliates Tetrahymena priformis and Oxytricha saprobia was examined in laboratory tests. The results showed that the acute toxicity of atrazine to S. obliquus, B. saltans, T. priformis and C. pyrenoidosa was high. The median effective...
This paper proposed a hydrodynamic model for the Meiliang lake based on the Environmental Fluid Dynamical Code (EFDC). Considered the different speed of wind and the process of reservoirs operation, we have been analyzed the growth of microcystis aeruginosa. The results showed that: (1) when the wind speed is 3m/s, the velocity of water flow is more suitable for the growth of microcystis aeruginosa;...
The shallow city river of Baoyang located in China had been eutrophicating with nutrients from domestic sewages for many years. A heavy bloom of Microcystis.aeruginosa in Baoyang River was recorded in 2004 and microcystin-RR (MCRR), the most popular cyanobacterial hepatotoxin microcystins in China, could be detected in the river in the next several years in the filtered waters. To determine the environmental...
South Taihu Lake used to get less attention in terms of environmental pollution study in the past. Sediment and fish samples were collected from South Taihu Lake in 2009. Heavy metals were measured for both types of samples and potential health risks were evaluated. Concentration of Cu, Zn, Cr and Ni were determined for sediments samples, and Cu, Zn, Ni, Fe and Mn were determined for fish samples...
The distribution characteristics of Yangshapao lake, one of the high fluorine lakes in western Jilin Province, is comprehensively studied. The distribution and thickness of ice layer occurring in winter season has great effect on the concentration of fluorine in water body that is distributed unevenly. The distribution characteristics of fluorine in ice layer is also studied. Water quality balance...
Based on building the small aquatic ecosystem in the room, the removal efficiency of total nitrogen (TN) and total phosphorus(TP) in polluted inflow river of Taihu Lake by Cyperus alternifolius(CA), Canna indica(CI), Elodea Canadensis Michx.(ECM) and Ceratophyllum demersum L.(CDL) was researched. The results showed that the removal efficiency of nitrogen and phosphorus in sewage were obvious through...
With the Tessier Five-step Continuous Extracting Method, the thesis studied the form distribution of heavy metals in the sediment samples collected from Mochou Lake, Xuanwu Lake and Qinhuai River in Nanjing, analyzed the correlation between leaching contents of heavy metals and various forms and between content of organic matter and leachability of heavy metals and between organic matter and organic...
In order to solve the hypoxia problem in Qinghai-Tibet railway tunnel construction, on the Qinghai-Tibet Pleatu, a pressure swing adsorption (PSA) cycle to concentrate oxygen from the low pressure atmosphere at high altitude had been developed. Two PSA oxygen generation stations were constructed which located in Fenghuoshan about 5000m high above sea level. Furthermore, a system of disperse oxygen...
Poyang Lake collects the water of five rivers (Ganjiang River, Fuhe River, Xinjiang River, Raohe River and Xiushui River) in Jiangxi Province. Therefore, the rainfall of each area of Jiangxi Province has large influence on the water level of Poyang Lake. In order to facilitate the prediction of flooding in the basin and the warning of it beforehand, this paper aims to build a model on the relation...
Taihu Lake is an important ecosystem in east China, and also an ecologically vulnerable region. Pesticide residues can be detected in Taihu Lake. Although the environmental concentrations are not high enough to harm the ecosystem acutely, the residues can pose potential risk to the ecosystem and human health because of their chronic impacts. It is necessary to assess the ecological risk induced by...
Since the 1980s, Chinese water environment has got worse and worse, and water pollution extended from local pollution to total watershed pollution. From the Ninth Five-Year Plan, the government recognized the seriousness of water pollution, and put the core of the prevention and cure of water pollution in Three Rivers and Three Lakes, e.i. Huaihe River, Haihe River, Liaohe River, Taihu Lake, Chaohu...
Nansihu is the largest lake of Shandong Province in China. It has a strategic significance because of its locating on the East Route Project of South to North Water Diversion. In 2004, the supplying water was about 3.10 × 108m3 and the water demand was about 2.56 × 104m3. Although the supplying water can satisfy requirement, the situation was not optimistic. At the same time, the total water resources...
The purpose of this work is to examine the effect of elevated carbon dioxide (CO2) and the relationship with wetland plant species in shallow lake wetlands in the East China. The wetland plant species such as Potamogeton crispun, Water hyacinth and Water iris were grown under two levels of CO2 in ambient and elevated (ambient CO2 + 200 μL L-1) respectively. They are grown in three replicated rooms,...
Organochlorine pesticides were detected and analyzed in surface water, bottom water and porewater from Honghu Lake, middle of China. The concentrations of total HCHs in surface water and bottom water were 3.52-5.68 ng/L and 3.77-6.86 ng/L respectively, and the concentrations of total DDTs were 0.39-2.38 ng/L and 0.91-6.05 ng/L respectively. Compared with the water quality of other regions, the concentrations...
Dynamic changes of the wetland in Qinghai-Tibet Plateau were analyzed by using images of the TM (Thematic Mapper) in 1990, the ETM+ (Enhanced Thematic Mapper Plus) in 2000 and the CBERS (China and Brazil Earth Resource Satellite) in 2006 as the main data source in this paper. And through man-computer interactive visual interpretation the wetland data of different periods in Qinghai-Tibet Plateau was...
The present study was to investigate the trophic state of Nansi Lake, a shallow lake employed in the South-to-North Water Diversion Project in China. Based on water transparency, total phosphorus (TP) and chlorophyll a (chl a) concentration, the modified method of Carlson's trophic state index (TSIM) was applied to assess the lake's trophic status. The Shannon diversity index of phytoplankton was...
To evaluate the impacts of wastewater from upper reaches, characteristics of microbial community were investigated using (PFU) method at four sampling stations in Baiyangdian Lake. At the same time, water sampling from these stations was conducted and five chemical parameters, including TP, TN, CODcr, NH4+-N and BOD5, were analyzed. Comprehensive chemical pollution index (PB) was also calculated based...
This study investigated phosphorus removal in the rivers inputting into Lake Taihu, Jiangsu Province. Ecological community properties of aquatic plants and algae in those rivers were surveyed with focus on diversity and density. The results showed that total phosphorus (TP) concentrations decreased along the runoff in the rivers, and the river with balanced algae community and integrated water plants...
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