Nanjing Institute of Environmental Sciences, Ministry of Environmental Protection, No. 8 Jiang Wang Miao Street, Nanjing 210042, China.
Key Laboratory of Integrated Regulation and Resources Development on Shallow Lakes, Ministry of Education, Hohai University, Nanjing 210098, China.
Int J Environ Res Public Health. 2018 Oct 25;15(11):2355. doi: 10.3390/ijerph15112355.
Spatial and seasonal variations of particulate phosphorus (PP) in a large shallow, eutrophic Lake Taihu with different ecotypes (including a phytoplankton-dominated zone, lake center zone, estuary zone and macrophyte-dominated zone) were investigated. The results showed that particulate organic phosphorus (POP) was the dominant form of PP (>88.0%). The concentration of POP showed higher levels in the bloom-sensitive northwestern zone (phytoplankton-dominated zone and estuary zone) during warm seasons, phytoplankton blooms and input of exogenous particulate matter were the main sources of POP in the lake water. Based on P nuclear magnetic resonance (P NMR) analysis, orthophosphate (Ortho-P) was the dominant molecular species of PP and positively correlated with soluble reactive phosphorus (SRP) ( < 0.01). This suggested that the release of Ortho-P from suspended particulate matter (SPM) was the main source of SRP in the lake water. Pyrophosphate (Pyro-P), which is regarded as a highly labile species of P compounds, represented a large fraction of PP, and its significant positive correlations with chlorophyll (Chl ), indicated that the concentration of Pyro-P could be used as an important indicator for the degree of eutrophication of Lake Taihu. These results proved that PP in lake water was a significant factor supporting lake eutrophication and must be controlled.
研究了不同生态型（包括浮游植物优势区、湖中心区、河口区和大型植物优势区）的太湖大型浅水富营养化湖泊中颗粒态磷（PP）的时空变化。结果表明，颗粒有机磷（POP）是 PP 的主要存在形式（>88.0%）。在温暖季节、浮游植物水华和外源颗粒物质输入期间，富营养化敏感的西北部区域（浮游植物优势区和河口区）的 POP 浓度较高，浮游植物水华是湖水中 POP 的主要来源。基于磷核磁共振（P NMR）分析，正磷酸盐（Ortho-P）是 PP 的主要分子种类，与可溶解性反应磷（SRP）呈正相关（<0.01）。这表明悬浮颗粒物（SPM）中 Ortho-P 的释放是湖水中 SRP 的主要来源。焦磷酸盐（Pyro-P）被认为是一种高度不稳定的磷化合物，它代表了 PP 的很大一部分，并且与叶绿素（Chl）呈显著正相关，这表明 Pyro-P 的浓度可以作为太湖富营养化程度的重要指标。这些结果证明了湖水中的 PP 是支持湖泊富营养化的重要因素，必须加以控制。
