Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; Yunnan Key Laboratory of Pollution Process and Management of Plateau Lake-Watershed, Kunming 650034, China.
Environ Pollut. 2013 Jun;177:13-21. doi: 10.1016/j.envpol.2013.01.047. Epub 2013 Mar 1.
Lake Yilong in Southwestern China has been under serious eutrophication threat during the past decades; however, the lake water remained clear until sudden sharp increase in Chlorophyll a (Chl a) and turbidity in 2009 without apparent change in external loading levels. To investigate the causes as well as examining the underlying mechanism, a three-dimensional hydrodynamic and water quality model was developed, simulating the flow circulation, pollutant fate and transport, and the interactions between nutrients, phytoplankton and macrophytes. The calibrated and validated model was used to conduct three sets of scenarios for understanding the water quality responses to various load reduction intensities and ecological restoration measures. The results showed that (a) even if the nutrient loads is reduced by as much as 77%, the Chl a concentration decreased only by 50%; and (b) aquatic vegetation has strong interaction with phytoplankton, therefore requiring combined watershed and in-lake management for lake restoration.
中国西南部的依龙湖在过去几十年中一直受到严重富营养化的威胁；然而，湖水在 2009 年叶绿素 a（Chl a）和浊度突然急剧增加之前，水质仍然清澈，而外部负荷水平没有明显变化。为了调查原因并研究潜在机制，开发了一个三维水动力和水质模型，模拟了水流循环、污染物归宿和输移，以及营养物质、浮游植物和大型水生植物之间的相互作用。经过校准和验证的模型用于进行三组情景模拟，以了解水质对各种减排强度和生态恢复措施的响应。结果表明：（a）即使减少 77%的营养负荷，Chl a 浓度也仅降低 50%；（b）水生植被与浮游植物有很强的相互作用，因此需要流域和湖泊内的综合管理来进行湖泊恢复。
