The low TN:TP ratio, a cause or a result of Microcystis blooms?

被引：195

作者：

Xie, LQ ^{[1
]}

Xie, P ^{[1
]}

Li, SX ^{[1
]}

Tang, HJ ^{[1
]}

Liu, H ^{[1
]}

机构：

[1] Wuhan Univ, Chinese Acad Sci, State Key Lab Freshwater Ecol & Biotechnol, Inst Hydrobiol,Donghu Expt Stn Lake Ecosyst, Wuhan 430072, Peoples R China

来源：

WATER RESEARCH | 2003年 / 37卷 / 09期

关键词：

TN : TP ratios; Microcystis blooms; enclosures; water and sediments; P-reduction;

D O I：

10.1016/S0043-1354(02)00532-8

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

An enclosure experiment in the shallow, subtropical Lake Donghu, China, was performed in the summer of 2001 to examine the effect of TN:TP (total phosphorus) ratios and P-reduction on the occurrence of Microcysitis blooms. The treatments were performed with enough amounts of N but with different amounts of P in the water column and sediment. Microcystis blooms occurred in the enclosures either with an initial TN:TP <29 or TN:TP >29 where the nutrients (N, P) were high enough. Microcysitis blooms never occurred in the treatments with low P concentration in spite of the presence of sufficient N. The P-rich sediments served as an important source for the P supply in the water column, and such a process was activated greatly by the outburst of Microcystis blooms which pumped up selectively P from the sediments and thus decreased the TN:TP ratios. Therefore, the low TN:TP ratio is not a cause but rather a result of Microcystis blooms. (C) 2002 Elsevier Science Ltd. All rights reserved.

引用

页码：2073 / 2080

页数：8

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