Aquatic vegetation in response to increased eutrophication and degraded light climate in Eastern Lake Taihu: Implications for lake ecological restoration.
Aquatic vegetation in response to increased eutrophication and degraded light climate in Eastern Lake Taihu: Implications for lake ecological restoration.
复制标题
东太湖水生植被对富营养化加剧和光气候退化的响应：对湖泊生态恢复的启示
DOI：
10.1038/srep23867
复制
发表时间：
2016-04-04
影响因子：
4.6
通讯作者：
Zhou Y
中科院分区：
文献类型：
--
作者：
Zhang Y;Liu X;Qin B;Shi K;Deng J;Zhou Y
陆地和水生生态系统退化被广泛认为是一个重大的全球环境和发展问题。尽管人们为防止水生态系统退化做出了很大努力，但这一现象的程度、范围和影响仍存在争议，其驱动机制也不清楚。在这里，我们提出了一个17年的水质实地调查（1998-2014）和12年的水生植被存在频率（VPF）的遥感制图（2003-2014）在东太湖，在中国太湖的水生植物为主的海湾。在过去的17年中，营养盐浓度和水位（WL）显着增加，但Secchi盘深度（SDD）显着减少。这些变化与湖泊富营养化加剧和水下光气候退化有关，进一步抑制了水生植被的生长。东太湖营养盐、叶绿素a和水重的增加以及SDD的降低均与VPF的降低呈显著相关。NH_4 ~+-N浓度和SDD/WL是VPF的重要控制因子。因此，增加的人为营养输入和水下光气候的退化必然导致VPF的降低。研究结果揭示了太湖水生植被退化的驱动机制，为太湖生态恢复提供了理论依据。
Terrestrial and aquatic ecosystem degradation is widely recognized as a major global environmental and development problem. Although great efforts have been made to prevent aquatic ecosystem degradation, the degree, extent and impacts of this phenomenon remain controversial and unclear, such as its driving mechanisms. Here, we present results from a 17-year field investigation (1998–2014) of water quality and a 12-year remote sensing mapping (2003–2014) of the aquatic vegetation presence frequency (VPF) in Eastern Lake Taihu, a macrophyte-dominated bay of Lake Taihu in China. In the past 17 years, nutrient concentrations and water level (WL) have significantly increased, but the Secchi disk depth (SDD) has significantly decreased. These changes were associated with increased lake eutrophication and a degraded underwater light climate that further inhibited the growth of aquatic vegetation. In Eastern Lake Taihu, increased nutrients, chlorophyll a and WL, and a decreased SDD were all significantly correlated with a decreased VPF. NH4+-N concentration and SDD/WL were the most important controlling factors for VPF. Therefore, increased anthropogenic nutrient inputs and a degraded underwater light climate surely result in a decreased VPF. These results elucidate the driving mechanism of aquatic vegetation degradation and will facilitate Lake Taihu ecological restoration.