College of Water Sciences, Beijing Normal University, Beijing, 100875, China.
State Key Laboratory of Environment Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China.
Environ Sci Pollut Res Int. 2017 Aug;24(22):18605-18618. doi: 10.1007/s11356-017-9474-7. Epub 2017 Jun 24.
To establish the influence of dissolved organic phosphorus (DOP) from different sources on the water quality of Erhai Lake in August 2014, enzymatic hydrolysis technology was used to characterize enzymatically hydrolyzable phosphorus (EHP). The results indicate that the DOP represents a significant source of the bioavailable P in the lake water and its different sources of Erhai Lake, and the bioavailability of the P pool may be underestimated by up to 55% if DOP is ignored and only the soluble-reactive phosphorus (SRP) is considered. The significant differences in DOP characteristics from the different sources may be related to the origin of the DOP, regional pollution, and environmental factors. The DOP from the sediment porewater can act as an important source of DOP in the lake water based on its high DOP content and high DOP loads from the sediment release. In addition, the highest EHP loads from the sediment release can threaten the water quality of Erhai Lake and sustain the algal blooms when they occur. Therefore, for the protection of Erhai Lake, the contributions of not only the SRP but also the DOP to the bioavailable P pool should be considered, emphasizing the eutrophication risk caused by DOP from sediments, especially in the middle section of Erhai Lake. The effects of DOP from the inflowing rivers on the water quality should also not be ignored, due to its high bioavailability.
为了确定 2014 年 8 月不同来源溶解态有机磷（DOP）对洱海水质的影响，采用酶水解技术对可酶解磷（EHP）进行了特征描述。结果表明，DOP 是洱海湖水中生物有效磷的重要来源，且其不同来源的 DOP 可能会导致磷库的生物有效性被低估 55%，如果忽略 DOP 而仅考虑可溶性反应磷（SRP）。不同来源 DOP 特征的显著差异可能与 DOP 的来源、区域污染和环境因素有关。基于高 DOP 含量和从沉积物释放的高 DOP 负荷，沉积物孔隙水中的 DOP 可以作为湖水中 DOP 的重要来源。此外，沉积物释放的最高 EHP 负荷可能会威胁到洱海的水质，并在藻类大量繁殖时维持其生长。因此，为了保护洱海，不仅要考虑 SRP，还要考虑 DOP 对生物有效磷库的贡献，特别是要强调沉积物中 DOP 引起的富营养化风险，尤其是在洱海的中段。还不应忽视来自入湖河流的 DOP 对水质的影响，因为其具有较高的生物有效性。
