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water flow. Afterwards, we set up a multi-factor model to evaluate the above factors and give the result.
Finally, we drew a grading figure to explain the trends of water bloom in Hanjiang River. The modeling
analysis method of multifactor can provide new ideas for watershed management institutions of Hanjiang
River basin.
Keywords: Water bloom; Multifactor; Hanjiang River basin; correlation analysis
Ecoregion based environmental protection mechanism in Taihu Lake basin
Bing Li, Haisuo Wu, Shui Wang, Jiayan Zhou
Corresponding author: Bing Li, PhD
Jiangsu Provincial Academy of Environmental Sciences
Fenghuang Xijie Street, Nanjing, Jiangsu Province, PR. China 210036, lb950618@126.com
http://www.ocwatersheds.com/
Abstract: Taihu Lake, located in the Yangtze Delta plain, is the third largest lake in China. It provides
drinking water for millions of residents and is an important resource for biodiversity, fisheries, migratory
birds, endangered species, as well as ecotourism. The eutrophic Taihu Lake has been selected as key
pollution control objective since 1990s. However, pollution in this area has been ongoing for decades
despite efforts to reduce pollution that were not effective enough. Environmental protection in Taihu Lake
basin calls for more efficient management mechanisms.
National Meta-Program for Science & Technology of Water Pollution Control initiated a research
program that focuses on environmental management mechanism design based on ecoregion zoning and
water ecosystem health protection in Taihu Lake basin since 2011. “Core” components of this research
program include: 1) geographical, ecological, chemical, and physical characteristics investigation in Taihu
Lake basin; 2) ecoregion zoning based on land use, lake water quality, morphometry, and watershed
characteristics; 3) protected species identification by recognizing the spatial differences in the capacities
and potentials of ecosystems; 4) ecoregion-specific criteria for water quality and pollutants discharge in
Taihu Lake basin; 5) ecological monitoring with improved scientific understanding of freshwater
ecosystem integrity and major habitat dynamics; 6) structuring and implementing ecosystem management
strategies across different agencies.
Effect of flow rate on environmental variables and phytoplankton dynamics: results from field
enclosures
Li Feipeng ( 李 飞 鹏 ) 1 , Zhang Haiping ( 张 海 平 ) 2 , Chen Ling ( 陈 玲 ) 2
1 College of Civil Engineering, Tongji University, 2 College of Environmental Science and
Engineering, Tongji University, Shanghai 200092, China, Email: lifeipeng@tongji.edu.cn,
hpzhang@tongji.edu.cn, chenling@tongji.edu.cn, Tel.: +86 21 65980757; Fax: +86 21 65984261
Abstract: The main objectives of this work were to investigate how the flow rate affect phytoplankton
dynamics and species interactions in natural enclosures and if such an effect was altered with physical
and biological variables.
Three sets of enclosure experiments were conducted in an artificial lake to investigate the effect of
flow rate on phytoplankton dynamics and related environment variables. Lower biomasses in all the
flowing enclosures showed that flow rates significantly inhibited the growth of phytoplankton. Changes in
flowing conditions caused a dramatic shift in phytoplankton species composition, from blues at still water
to greens due to competition for light. Flow rate significantly enhanced inter-relationship among
environmental variables, especially induced higher water turbidity, and stimulated vegetative reproduction
of periphyton (Spirogyra), accompanied by the decrease of underwater light intensity, which in
consequence may inhibit the photosynthetic intensity of phytoplankton. Competition for light was a key
factor determining the changes in phytoplankton community structure.
The findings may find useful application in water management, improving prediction of the flow rate
required to inhibit phytoplankton biomass increasing and prevent surface blooms of harmful
cyanobacteria.
Keywords: Environmental variables, Phytoplankton, Enclosure experiment, Flow rate
Studies on algae bloom of Xiangxi River in the Three Georges Resevroir Area based on
Multiple Parameter model
Hai-yan Li Pei-jiang Zhou Bai-shan Li Wei Hang Mei-ling Xiao
School of Resource and Environmental Science, Hubei Biomass-Resource Chemistry and
Environmental Biotechnology Key Laboratory, Wuhan University, Wuhan430079, China
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