Bai Xiuling, Sun Jinhua, Zhou Yunkai, Gu Lei, Zhao Hongyan, Wang Jiehua
Institute of Natural Resources and Environment, Henan University, Kaifeng 475004, China; College of Environment and Planning, Henan University, Kaifeng 475004, China.
College of Geoscience and Surveying Engineering, China University of Mining & Technology, Beijing 100083, China.
Chemosphere. 2017 Feb;169:577-585. doi: 10.1016/j.chemosphere.2016.11.116. Epub 2016 Nov 27.
Characterization of phosphorus (P) pools is vital to understanding the contribution of P to water eutrophication. In this study, dissolved and particulate P classes during an algae bloom in Lake Taihu, as well as their relationships with the main environmental factors, were analyzed based on solution P NMR. The results showed that dissolved P was dominated by orthophosphate (Ortho-P) in heavily polluted regions and by orthophosphate monoester (Mono-P) and orthophosphate diester (Diester-P) in lightly polluted regions, indicating that the main dissolved P classes varied with the degree of lake pollution. The difference in the temporal variation patterns of dissolved P classes revealed that dissolved Ortho-P is the preferred class, and its concentration may be affected by major primary producers. It also revealed that dissolved Mono-P is prone to accumulation under the effects of algal blooms, especially in heavily polluted regions. The main particulate P classes were similar to those of dissolved P, but their variation trends were the same in different lake regions. There were significant positive correlations between the major particulate P classes and Chl a during the majority of the sampling period, indicating that living algal cells have a major contribution to particulate P. Obvious temporal variations of P classes may affect the bioavailability and dynamics of P in the water of Lake Taihu, but the particle reactivities of the main inorganic and organic P classes were similar. Therefore, they have little effect on P partitioning between the dissolved and particulate phases.
磷（P）库的表征对于理解磷对水体富营养化的贡献至关重要。在本研究中，基于溶液磷核磁共振（P NMR）分析了太湖藻华期间溶解态和颗粒态磷的类别，以及它们与主要环境因子的关系。结果表明，在污染严重的区域，溶解态磷以正磷酸盐（Ortho-P）为主，而在污染较轻的区域则以磷酸单酯（Mono-P）和磷酸二酯（Diester-P）为主，这表明主要的溶解态磷类别随湖泊污染程度而变化。溶解态磷类别在时间变化模式上的差异表明，溶解态正磷酸盐是首选类别，其浓度可能受主要初级生产者的影响。这也表明，溶解态磷酸单酯在藻华的影响下容易积累，尤其是在污染严重的区域。主要的颗粒态磷类别与溶解态磷相似，但在不同湖区其变化趋势相同。在大多数采样期间，主要颗粒态磷类别与叶绿素a之间存在显著正相关，表明活藻细胞对颗粒态磷有主要贡献。磷类别的明显时间变化可能会影响太湖水体中磷的生物可利用性和动态，但主要无机和有机磷类别的颗粒反应性相似。因此，它们对磷在溶解相和颗粒相之间的分配影响很小。
