Water Science and Engineering 2012, 5(4) 361-374 DOI:   10.3882/j.issn.1674-2370.2012.04.001  ISSN: 1674-2370 CN: 32-1785/TV

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Taihu Lake
Microcystis bloom
water temperature
climate change
Lin-lin CAI
Guang-wei ZHU
Meng-yuan ZHU
Hai XU
Bo-qiang QIN
Article by Lin-lin CAI
Article by Guang-wei ZHU
Article by Meng-yuan ZHU
Article by Hai XU
Article by Bo-qiang QIN

Effects of temperature and nutrients on phytoplankton biomass during bloom seasons in Taihu Lake

Lin-lin CAI1, 2, Guang-wei ZHU*1, Meng-yuan ZHU1, Hai XU1, Bo-qiang QIN1

1. State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, P. R. China
2. Wuxi Taihu Lake Management Company Limited, Wuxi 214063, P. R. China


Long-term variations of phytoplankton chlorophyll-a (Chl-a), nutrients, and suspended solids (SS) in Taihu Lake, a large shallow freshwater lake in China, during algal bloom seasons from May to August were analyzed using the monthly investigated data from 1999 to 2007. The effective accumulated water temperature (EAWT) in months from March to June was calculated with daily monitoring data from the Taihu Laboratory for Lake Ecosystem Research (TLLER). The concentrations of Chl-a and nutrients significantly decreased from Meiliang Bay to Central Lake. Annual averages of the total nitrogen (TN), total phosphorus (TP), and Chl-a concentrations, and EAWT generally increased in the nine years. In Meiliang Bay, the concentration of Chl-a was significantly correlated with EAWT, ammonia nitrogen ( ), TN, the soluble reactive phosphorus (SRP), TP, and SS. In Central Lake, however, the concentration of Chl-a was only correlated with EAWT, TP, and SS. Multiple stepwise linear regression revealed that EAWT, dissolved total phosphorus (DTP), and TP explained 99.2% of the variation of Chl-a in Meiliang Bay, and that EAWT,  , and TP explained 98.7% of the variation of Chl-a in Central Lake. Thus EAWT is an important factor influencing the annual change of phytoplankton biomass. Extreme climate change, such as extremely hot springs or cold springs, could cause very different bloom intensities in different years. It is also suggested that both nutrients and EAWT played important roles in the growth of phytoplankton in Taihu Lake. The climate factors and nutrients dually controlled the risk of harmful algal blooms in Taihu Lake. Cutting down phosphorus and nitrogen loadings from catchments should be a fundamental strategy to reduce the risk of blooms in Taihu Lake.

Keywords Taihu Lake   Microcystis bloom   water temperature   nutrients   climate change  
Received 2011-11-14 Revised 2012-05-28 Online: 2012-12-29 
DOI: 10.3882/j.issn.1674-2370.2012.04.001

This work was supported by the National Natural Science Foundation of China (Grants No. 51279194 and 41230744) and the External Cooperation Program of the Chinese Academy of Sciences (Grant No. GJHZ1214).

Corresponding Authors: Guang-wei ZHU
Email: gwzhu@niglas.ac.cn
About author:

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