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引用本文:朱小龙,谷娇,靳辉,宁晓雨,何虎,谈冰畅,杨桂军,李宽意.太湖河蚬(Corbiculafluminea)对富营养水体水质的改善作用.湖泊科学,2015,27(3):486-492. DOI:10.18307/2015.0316
ZHU Xiaolong,GU Jiao,JIN Hui,NING Xiaoyu,HE Hu,TAN Bingchang,YANG Guijun,LI Kuanyi.Effects of Corbicula fluminea in Lake Taihu on improvement of eutrophic water quality. J. Lake Sci.2015,27(3):486-492. DOI:10.18307/2015.0316
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太湖河蚬(Corbiculafluminea)对富营养水体水质的改善作用
朱小龙1,2, 谷娇2, 靳辉1,2, 宁晓雨2, 何虎2, 谈冰畅2,3, 杨桂军1, 李宽意2
1.江南大学环境与土木工程学院, 无锡 214122;2.中国科学院南京地理与湖泊研究所湖泊与环境国家重点实验室, 南京 210008;3.贵州大学动物科学学院, 贵阳 550025
摘要:
河蚬(Corbicula fluminea)为太湖优势大型底栖动物,通过受控实验研究其对富营养水体的水质改善效果. 根据太湖河蚬的自然丰度设置4组密度处理,分别为无河蚬对照组、低密度河蚬组(生物量为130 g/m2)、中密度河蚬组(260 g/m2)和高密度河蚬组(520 g/m2). 结果表明:河蚬滤食显著降低悬浮物浓度与叶绿素a含量,低、中、高密度河蚬组水体悬浮物浓度较对照组分别降低了20.85%、34.90%和53.79%,叶绿素a浓度分别降低了23.29%、48.32%和71.17%;放置河蚬还降低了水体TN、TP浓度,但是中密度河蚬组与高密度河蚬组没有显著差异. 分析认为,河蚬通过滤食作用降低水体浊度、改善光照条件,有利于底栖藻类的生长及沉水植物的恢复,对富营养水体的生态修复具有重要意义;就太湖而言,河蚬对水质的改善效果可能受沉积物再悬浮造成的营养盐释放等因素的制约.
关键词:  河蚬  密度  富营养水体  水质改善  太湖
DOI:10.18307/2015.0316
分类号:
基金项目:国家水体污染控制与治理科技重大专项(2012ZX07101013)、国家自然科学基金项目(31170441,31370477,41101053)和中国科学院南京地理与湖泊研究所"一三五"战略发展规划项目(NIGLAS2012135002,NIGLAS2012135012)联合资助.
Effects of Corbicula fluminea in Lake Taihu on improvement of eutrophic water quality
ZHU Xiaolong1,2, GU Jiao2, JIN Hui1,2, NING Xiaoyu2, HE Hu2, TAN Bingchang2,3, YANG Guijun1, LI Kuanyi2
1.School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, P.R.China;2.State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, P.R.China;3.College of Animal Science, Guizhou University, Guiyang 550025, P.R.China
Abstract:
Corbicula fluminea is the dominate species among the large benthic organisms in Lake Taihu.A controlled experiment was conducted to assess the effects of C.fluminea on water quality improvement with four treatments of different densities of C.fluminea of Lake Taihu.C.fluminea was put in four groups:the none, low, medium and high densities were designed as 0 g/m2 (control group), 130 g/m2, 260 g/m2, 520 g/m2, respectively.The results showed that, in contrast with the control group, the concentrations of suspended particulate materials of water in low, medium and high density groups significantly reduced by 20.85%, 34.90% and 53.79%, respectively.Moreover, chlorophyll-a concentrations significantly reduced in C.fluminea treatments with the decrement of 23.29%, 48.32% and 71.17%, respectively from the low to high density groups.Meanwhile, total nitrogen and total phosphorus concentrations of water reduced in C.fluminea groups, while no significant difference showed between medium density and high density treatments.It revealed that C.fluminea could purify eutrophic water by filter-feeding phytoplankton and organic suspended materials, lowering the water turbidity, and improving light conditions, which was conducive to the growth of periphyton on the lake bottom and the restoration of aquatic plants.It is suggested that C.fluminea has an important ecological significance to the restoration of eutrophic waters.However, in terms of Lake Taihu, the effect of C.fluminea on the water quality improvement may be hampered by resuspension process which releases nutrients from the water-sediment interface.
Key words:  Corbicula fluminea  density  eutrophication  water quality improvement  Lake Taihu
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