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引用本文:吴芝瑛,虞左明,盛海燕,徐骏,韩轶才,许云台,冯宁,姚佳玫.杭州西湖底泥疏浚工程的生态效应.湖泊科学,2008,20(3):277-284. DOI:10.18307/2008.0303
WU Zhi-ying,YU Zuo-ming,SHENG Hai-yan,XU Jun,HAN Yi-cai,XU Yun-tai,FENG Ning,YAO Jia-mei.Ecological effects of the dredging in the West Lake,Hangzhou. J. Lake Sci.2008,20(3):277-284. DOI:10.18307/2008.0303
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杭州西湖底泥疏浚工程的生态效应
吴芝瑛1, 虞左明2, 盛海燕2, 徐骏1, 韩轶才2, 许云台2, 冯宁2, 姚佳玫2
1.杭州西湖水域管理处, 杭州 310002;2.杭州市环境保护科学研究院, 杭州 310014
摘要:
杭州西湖一直被富营养化问题所困扰.迄今为止,先后采用了多种工程措施进行治理.通过对杭州市政府1999-2002年对西湖实施的底泥疏浚工程前后沉积物中营养物质含量、水质以及水生生物群落各主要类群等方面的研究,评价了此次工程对减轻西湖的营养盐内负荷、控制湖泊富营养化的效果,探讨该工程的生态风险及对西湖水生生态系统重建的影响.研究结果表明:疏浚工程降低了西湖各层沉积物中的有机物、氮和磷含量,尤其是沉积物表层10cm中的有机质、总氮和有机磷含量均有明显的下降;疏浚后西湖水体与富营养化相关的主要指标均有不同程度的改善;水体中浮游植物密度、生物量有不同程度的降低,群落中蓝藻比例下降;浮游动物群落的种类有所增加;疏浚后底栖大型无脊椎动物群落快速恢复;疏浚后的水生生物群落指示水体富营养化程度有所减轻.
关键词:  疏浚  富营养化  沉积物  水生生物  杭州西湖
DOI:10.18307/2008.0303
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Ecological effects of the dredging in the West Lake,Hangzhou
WU Zhi-ying1, YU Zuo-ming2, SHENG Hai-yan2, XU Jun1, HAN Yi-cai2, XU Yun-tai2, FENG Ning2, YAO Jia-mei2
1.Management of Water Area of the West Lake, Hangzhou 310002, P.R.China;2.Institute of Environmental Protection Science, Hangzhou 310014, P.R.China
Abstract:
The West Lake, a famous scenic spot for tourists in China, is a small shallow eutrophic lake. However, the lake has been suffering from eutrophication from year to year and its beauty is marred by low transparency of the water. To control its eutrophication, a great deal funds had been invested and some projects had been organized by the government in the past twenty years. The effects of these projects were not satisfactory and the eutrophication is still progressing. Thus, the average depth 0.5m of silt on the bottom of the West Lake was dredged largely from 1999 to 2002. During the Jan. 1999 to Dec. 2000, the N and P of the sediment and water quality were surveyed, the phytoplankton, zooplankton and benthos communities (including species composition and density biomass) were investigated in the West Lake. To compare the investigated result with previous results and data (before the dredging), the succession of the communities was discussed. Further, the ecological effect of the dredging and the present trophic state of the lake were evaluated. The results showed that the N and P content in the sediment were decreased after the dredge, the water quality had been improved obviously, and the density in the phytoplankton community and the chlorophyll-a concentrations had decreased obviously comparing those in 1999, and the trophic level also had decreased in main lake areas.
Key words:  Dredge  eutrophication  sediment  hydro-organism  West Lake, Hangzhou
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