Effect of submerged macrophyte restoration on improving aquatic ecosystem in a subtropical, shallow lake
Effect of submerged macrophyte restoration on improving aquatic ecosystem in a subtropical, shallow lake
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DOI：
10.1016/j.ecoleng.2017.05.018
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发表时间：
2017-09
影响因子：
3.8
通讯作者：
Lei Zeng;F. He;Zhigang Dai;Xu Dong;Biyun Liu;Qiaohong Zhou;Zhenbin Wu
中科院分区：
文献类型：
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作者：
Lei Zeng;F. He;Zhigang Dai;Xu Dong;Biyun Liu;Qiaohong Zhou;Zhenbin Wu
以亚热带浅水湖泊为研究对象，采用沉水植物修复技术治理湖泊富营养化，改善水质。为探讨水生植物修复对改善水生态系统的作用，对该水域的水生植物、浮游植物、浮游动物及水质进行了连续3年的调查。结果表明，恢复后的水生植物生物量和盖度分别高达821 g/m2和55%，优势种为金鱼藻、狐尾藻和子菜。此外，化学需氧量（COD）、总氮（TN）、总悬浮物（TSS）和硝酸盐氮（NN）呈显著下降趋势，而总磷（TP）和氨氮（AN）变化不显著。浮游植物密度和生物量显著下降，优势种由蓝藻绿色藻转变为绿色藻。浮游动物的密度和生物量逐年增加，小型优势种（如螺旋角藻、三角多鞭毛虫等）逐渐被大型种（如阿氏囊壳（Asplanchna priodonala）、点斑腹蛛（Alona guttata）等）所取代。在修复期间。此外，水生植物与营养盐呈负相关，与浮游动物呈正相关。浮游植物与总氮呈正相关。这些相关性表明，恢复水生植物可以降低水体营养负荷，抑制浮游植物生长，降低水华风险，支持更多大型浮游动物，加强对浮游植物的自上而下控制。因此，水生植物恢复是一种非常有潜力和有效的治理富营养化亚热带湖泊水质的方法，在未来的亚热带/热带湖泊管理中值得重视。
Submerged macrophyte restoration was used to combat with lake eutrophication and improve water quality in a subtropical, shallow lake. A consistent investigation for three years about macrophyte, phytoplankton, zooplankton and water quality has been conducted to explore the effect of macrophyte restoration on improving aquatic ecosystem. The results showed that macrophyte biomass and coverage after the restoration were as high as 821 g/m2and 55%, respectively, and the dominant species wereCeratophyllum demersum,Myriophyllum verticillatumandPotamogeton crispus. Moreover, chemical oxygen demand (COD), total nitrogen (TN), total suspended solids (TSS) and nitrate nitrogen (NN) significantly decreased yearly, but the changes in total phosphorus (TP) and ammonia nitrogen (AN) were not significant during the investigation. Phytoplankton density and biomass significantly decreased, and the dominant species changed from blue-green algae to green algae. Zooplankton density and biomass, however, significantly increased yearly, and the small-sized dominant species (such as,Keratella cochlearis,Polyarthra trigla, etc.) were gradually replaced by the large-sized species (such as,Asplanchna priodonala,Alona guttata, etc.) during the restoration. In addition, macrophyte was negatively correlated with nutrients, but positively correlated with zooplankton. Phytoplankton was also positively related with TN. These correlations showed that restored macrophytes could decrease nutrition loading in water body, inhibit phytoplankton growth to decrease the risk of algae blooms, and support more large-sized zooplankton to strengthen the top-down control of phytoplankton. Therefore, our results showed that macrophyte restoration is a very potential and effective method to combat with the eutrophication and develop water quality in the eutrophic subtropical lakes, and deserves more attentions in future subtropical/tropical lake managements.