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引用本文:钟继承,刘国锋,范成新,李宝,张路,丁士明.湖泊底泥疏浚环境效应:Ⅱ.内源氮释放控制作用.湖泊科学,2009,21(3):335-344. DOI:10.18307/2009.0304
ZHONG Jicheng,LIU Guofeng,FAN Chengxin,LI Bao,ZHANG Lu,DING Shiming.Environmental effect of sediment dredging in lake: Ⅱ. the role of sediment dredging in reducing internal nitrogen release. J. Lake Sci.2009,21(3):335-344. DOI:10.18307/2009.0304
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湖泊底泥疏浚环境效应:Ⅱ.内源氮释放控制作用
钟继承, 刘国锋, 范成新, 李宝, 张路, 丁士明
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
摘要:
通过为期一年的疏浚模拟试验,在试验室培养疏浚与对照柱样研究了底泥疏浚对内源氮释放的控制效果.研究结果发现,疏浚表层30cm能够有效的消减沉积物中有机质含量与孔隙水中NH4+含量.在一年的试验周期内,疏浚和对照柱沉积物-水界面的NH4+通量分别为5.3至18.6mg/(m2·d)与-9.4至67.5mg/(m2·d),疏浚柱沉积物-水界面的NH4+通量总体上低于未疏浚对照的通量,尤其是在温度较高的月份,从2006年5-12月疏浚柱沉积物-水界面NH4+释放通量显著低于未疏浚对照柱,疏浚沉积物的NH4+的释放潜力低于未疏浚对照沉积物.研究结果表明,在外源得到有效控制的前提下,底泥疏浚是消减研究区内源氮负荷有效的技术手段.
关键词:  底泥疏浚  内源  氮释放  太湖
DOI:10.18307/2009.0304
分类号:
基金项目:中国科学院知识创新工程领域前沿项目(CXNIGLAS200804);江苏省社会发展项目(BS2007161);国家高技术研究发展计划(2007AA06Z411)
Environmental effect of sediment dredging in lake: Ⅱ. the role of sediment dredging in reducing internal nitrogen release
ZHONG Jicheng, LIU Guofeng, FAN Chengxin, LI Bao, ZHANG Lu, DING Shiming
State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, P. R. China
Abstract:
A laboratory experiment for studying the effects of sediment dredging on nitrogen release from lake sediments was carried out through one-year incubation of undredged (control) and dredged cores. We found that dredging the upper 30cm layer of the sediment can efficiently reduce organic matter content in the sediment and the interstitial NH4+ concentration. The NH4+ fluxes of the dredged and undredged cores ranged from 5.3 to 18.6mg/(m2·d) and -9.4 to 67.5mg/(m2·d), respectively. The fluxes of the dredged cores were generally lower than those of the undredged(control) cores, with significant(P<0.05)differences in the fluxes of the dredged and undredged cores occurring between May and December of 2006. The NH4+ in the dredged cores had a lower release potential than that in the control cores. Our results suggested that dredging may be a useful approach for decreasing internal nitrogen loading in Lake Taihu once the external loading was first effectively controlled.
Key words:  Sediment dredging  internal source  nitrogen release  Lake Taihu
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