Lake Gehu is a severely eutrophic lake in southeast China. A series of restoration measures have been implemented since 2009 in northern Lake Gehu. This study compared aquatic plants, water quality, sediment, and phyt...Lake Gehu is a severely eutrophic lake in southeast China. A series of restoration measures have been implemented since 2009 in northern Lake Gehu. This study compared aquatic plants, water quality, sediment, and phytoplankton between restoration and control areas to investigate the effect of restoration measures. The results demonstrated that aquatic macrophyte coverage increased from 0% to 10.6%; mean TP, TN, and CODm concentrations decreased by 50.0%, 42.4%, and 40.8%, respectively, compared with those before the measures were carried out; the mean Secchi depth （SD） increased to 42.5 cm, which is 1.4 times higher than that before restoration; the mean euphotic depth （Zeu） in the summer increased from 91 to 130 cm; the mean chl a concentration decreased from 34.8 to 20.2 μg/L, compared with that before restoration; the Shannon-Wiener index of phytoplankton increased by 28.7%. The mean TP and TN concentrations in sediments decreased by 63.8% and 52.4%, respectively, compared with that before dredging. These results indicate that the restoration in northern Lake Gehu was effective. To complete the transformation from an algae- to a macrophyte-stable state within the region, further measures must be adopted. This restoration of a eutrophic lake can serve as a reference for similar eutrophic lakes.展开更多
根据2010年对江苏滆湖渔业资源和生态环境调查数据,采用Ecopath with Ecosim软件构建了滆湖生态系统的物质平衡ecopath模型,以期为在滆湖进行生态修复提供支持和指导。ecopath分析结果表明:2010年滆湖生态系统包含7个营养级,各功能组的...根据2010年对江苏滆湖渔业资源和生态环境调查数据,采用Ecopath with Ecosim软件构建了滆湖生态系统的物质平衡ecopath模型,以期为在滆湖进行生态修复提供支持和指导。ecopath分析结果表明:2010年滆湖生态系统包含7个营养级,各功能组的有效营养级范围为1～3.691,其营养物质流动主要发生在前4个营养级,占总流量的99.8%。系统总生产量为1 974.82t/km2.a,总流量为8 562.544t/km2.a,联结指数、系统杂食系数、Finn’s循环指数以及Finn’s平均路径长度分别为0.219、0.189、7.99和2.841;生产量/呼吸量、生产量/生物量分别为2.189和3.509;平均捕捞营养级为2.56。食物链以开始于藻类的牧食食物链和开始于碎屑的碎屑食物链为主,系统总能量转换效率为6.4%。与滆湖1986～1989年的ecopath模型相比较,滆湖生态系统的总流量减小,r-对策者在系统中所占比例增加,K-对策者在系统中所占比例减小,根据Odum对成熟生态系统的描述,滆湖目前正处于退化演变过程中。展开更多
基金Supported by the Major Science and Technology Program for Water Pollution Control and Treatment of China(No.2012ZX07101-007-01)the Collaborative Innovation Center of Technology and Material of Water Treatment
文摘Lake Gehu is a severely eutrophic lake in southeast China. A series of restoration measures have been implemented since 2009 in northern Lake Gehu. This study compared aquatic plants, water quality, sediment, and phytoplankton between restoration and control areas to investigate the effect of restoration measures. The results demonstrated that aquatic macrophyte coverage increased from 0% to 10.6%; mean TP, TN, and CODm concentrations decreased by 50.0%, 42.4%, and 40.8%, respectively, compared with those before the measures were carried out; the mean Secchi depth （SD） increased to 42.5 cm, which is 1.4 times higher than that before restoration; the mean euphotic depth （Zeu） in the summer increased from 91 to 130 cm; the mean chl a concentration decreased from 34.8 to 20.2 μg/L, compared with that before restoration; the Shannon-Wiener index of phytoplankton increased by 28.7%. The mean TP and TN concentrations in sediments decreased by 63.8% and 52.4%, respectively, compared with that before dredging. These results indicate that the restoration in northern Lake Gehu was effective. To complete the transformation from an algae- to a macrophyte-stable state within the region, further measures must be adopted. This restoration of a eutrophic lake can serve as a reference for similar eutrophic lakes.
文摘根据2010年对江苏滆湖渔业资源和生态环境调查数据,采用Ecopath with Ecosim软件构建了滆湖生态系统的物质平衡ecopath模型,以期为在滆湖进行生态修复提供支持和指导。ecopath分析结果表明:2010年滆湖生态系统包含7个营养级,各功能组的有效营养级范围为1～3.691,其营养物质流动主要发生在前4个营养级,占总流量的99.8%。系统总生产量为1 974.82t/km2.a,总流量为8 562.544t/km2.a,联结指数、系统杂食系数、Finn’s循环指数以及Finn’s平均路径长度分别为0.219、0.189、7.99和2.841;生产量/呼吸量、生产量/生物量分别为2.189和3.509;平均捕捞营养级为2.56。食物链以开始于藻类的牧食食物链和开始于碎屑的碎屑食物链为主,系统总能量转换效率为6.4%。与滆湖1986～1989年的ecopath模型相比较,滆湖生态系统的总流量减小,r-对策者在系统中所占比例增加,K-对策者在系统中所占比例减小,根据Odum对成熟生态系统的描述,滆湖目前正处于退化演变过程中。
