The effects of temperature and nutrient ratios on Microcystis blooms in Lake Taihu, China: An 11-year investigation
The effects of temperature and nutrient ratios on Microcystis blooms in Lake Taihu, China: An 11-year investigation
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DOI：
10.1016/j.hal.2010.12.002
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发表时间：
2011-03-01
期刊：
影响因子：
6.6
通讯作者：
Chen, Yuwei
中科院分区：
文献类型：
--
作者：
Liu, Xia;Lu, Xiaohua;Chen, Yuwei
利用11年（1992 - 2002年）连续的环境数据记录以及浮游植物种类信息，对太湖北部（梅梁湾）形成水华的蓝藻——微囊藻的时间分布及其与相关理化变量（包括总氮与总磷的比值（TN:TP）、铵态氮与硝态氮的比值（NH₄ - N:NOₓ - N）、水温以及pH）之间的相关性进行了研究。多元统计分析——典范对应分析（CCA）表明，微囊藻与TN:TP呈负相关，与NH₄ - N:NOₓ - N、水温和pH呈正相关。温暖的水温是驱动微囊藻水华的主要因素，在此之前氮化合物浓度下降。在夏季，当TN:TP质量比小于30、NH₄ - N:NOₓ - N低于1，且临界水温在25℃至30℃之间时，微囊藻往往在太湖北部占优势（微囊藻对藻类总生物量的贡献率超过50%）。同时，在水华期间，悬浮物（SS）浓度超过10 mg/L，pH超过8.0。总体而言，这项研究增进了我们对营养物质富集以及环境高温对微囊藻生物量影响的理解。（C）2010爱思唯尔有限公司。版权所有。
The temporal distribution of bloom-forming cyanobacteria- Microcystis and its correlation with related physical and chemical variables including the total nitrogen-to-total phosphorus ratio (TN:TP), the ammonium-to-nitrate ratio (NH4-N:NOx-N), water temperature, and pH in the north part of Lake Taihu (Meiliang Bay) were investigated, using a continuous, 11-year record of environmental data (1992-2002) and phytoplankton species. A multivariate statistical analysis, canonical correspondence analysis (CCA), revealed a negative correlation between the Microcystis and TN:TP, and a positive correlation between the Microcystis and NH4-N:NOx-N, water temperature and pH. Warm water temperature was the principal force driving Microcystis blooms, which were preceded declining concentrations of nitrogen compounds. Microcystis tended to dominate (Microcystis contributed above 50% to total algal mass) in the north part of Lake Taihu during summer when the TN:TP mass ratio was less than 30. NH4-N:NOx-N was below 1, and a critical water temperature ranged from 25 degrees C to 30 degrees C. respectively. Meanwhile, suspended solids (SS) concentrations exceeded 10 mg l(-1) and pH exceeded 8.0 during blooms. Overall, this study advances our understanding of nutrient enrichment and high ambient temperature influences on Microcystis biomass. (C) 2010 Elsevier B.V. All rights reserved.