太湖叶绿素a浓度分布的时空特征及其影响因素
Spatial-temporal characteristic and influential factors of the chlorophyll-a concentration of Taihu Lake
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摘要: 基于2005—2009年20次太湖采样期间的水质监测数据,研究了太湖叶绿素a浓度的主要分布特征,分析了水环境因子对叶绿素a浓度分布的季节性和空间性影响.结果表明,太湖叶绿素a浓度分布的空间差异较大,主要表现为梅梁湾、竺山湾、太湖西部和西南部湖区为叶绿素a浓度距平经验正交分解(EOF)第一模态空间分布的显著正值区,太湖湖心和东南湖区则为负值区;影响叶绿素a浓度的因子有水温、溶解氧、总氮、磷酸根和总磷,但总磷和水温的影响相对更为显著,而各季节叶绿素a浓度的影响因子则略有差异;影响藻类生长的因子存在较大的空间分布差异,但总磷、水温和溶解氧是其主要限制性因子,氮类营养盐的影响则处于次要地位.Abstract: Based on the 20 times of investigable data in Taihu Lake obtained from 2005 to 2009, this paper analysed the distribution of chlorophyll-a and explored the effects of water environment factors on seasonal and spatial distribution of chlorophyll-a. The results showed that the variation of chlorophyll-a was large and it mainly presented positive-value centers of the spatial distribution of the first mode obtained by EOF analysis of chlorophyll-a in the Meiliang Bay, Zhushan Bay, western and southwestern Taihu Lake, while the negative-value centers were distributed in the center and southeast of Taihu Lake. Water temperature, dissolved oxygen, total nitrogen, phosphate and total phosphate were the impact factors to chlorophyll-a, and total phosphate and water temperature were more significant but the impact factors were a little changed in different seasons. There were obvious differences of spatial distribution of impact factors to the algal growth, and total phosphate, water temperature and dissolved oxygen were the primary restrictive factors, but nutrient was less important.
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Key words:
- Taihu Lake /
- chlorophyll-a /
- EOF /
- Q clustering analysis /
- stepwise regression
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