| 不同密度藻屑堆积下沉积物碳氮磷释放特征 |
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| 引用本文： | 王亚蕊,陈向超,付绪金,钟继承,陈开宁,王城新,冯慕华.不同密度藻屑堆积下沉积物碳氮磷释放特征[J].湖泊科学,2018,30(4):925-936. |
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| 作者姓名： | 王亚蕊 陈向超 付绪金 钟继承 陈开宁 王城新 冯慕华 |
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| 作者单位： | 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;中国科学院大学;天津市水利科学研究院;南京工程学院 |
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| 基金项目： | 国家自然科学基金项目（41471075，41171366）、国家水体污染控制与治理科技重大专项（2017ZX07603-005）、江苏省高校水处理技术与材料协同创新中心项目和天津市水务局于桥水库专项课题联合资助. |
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| 摘 要： | 蓝藻碎屑分解引起氮磷释放已受到广泛关注,但堆积的藻屑与沉积物交互作用引发污染物释放的效应知之甚少.采集于桥水库沉积物柱状样,设置5个藻屑添加组和对照组(无藻屑添加),恒温培养(27±1℃),模拟夏季温度条件下不同密度藻屑堆积下沉积物中碳氮磷释放特征.结果表明:藻屑堆积后加强了上覆水中溶解氧与硝态氮的消耗,5个藻屑添加组18小时后上覆水均处于厌氧状态.各实验组上覆水中的溶解性有机碳(DOC)浓度在第3小时增加,且SUVA254值处于0.54~1.74 L/(mg·m)之间,说明DOC可能来源于藻源性释放.各藻屑添加组培养过程中上覆水的溶解性有机氮(DON)、铵态氮和正磷酸盐浓度持续增加,最高平均释放速率分别达4.44、0.20和0.03 mg/(L·h),分别为对照组的21.73、1.76和67.58倍;其中DON为溶解性总氮主要存在形态,在实验结束时DOC/DON比值降低,说明藻屑或者沉积物有机质短期内并未完全矿化,且DOC优先DON被微生物利用.因此蓝藻碎屑堆积增强了沉积物需氧量,加快沉积物与水之间的氮磷营养盐、DOC循环,从而对沉积物中污染物地球化学循环过程造成进一步的影响.
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| 关 键 词： | 蓝藻水华 沉积物 营养盐 溶解性有机碳 于桥水库 藻屑堆积 |
| 收稿时间： | 2017/9/20 0:00:00 |
| 修稿时间： | 2017/11/1 0:00:00 |
The releasing characteristics of carbon, nitrogen and phosphorus from sediment under the influence of different densities of algal detritus |
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| WANG Yarui,CHEN Xiangchao,FU Xujin,ZHONG Jicheng,CHEN Kaining,WANG Chengxin and FENG Muhua.The releasing characteristics of carbon, nitrogen and phosphorus from sediment under the influence of different densities of algal detritus[J].Journal of Lake Science,2018,30(4):925-936. |
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| Authors: | WANG Yarui CHEN Xiangchao FU Xujin ZHONG Jicheng CHEN Kaining WANG Chengxin and FENG Muhua |
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| Institution: | State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, P. R. China;University of Chinese Academy of Sciences, Beijing 100049, P. R. China,State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, P. R. China;University of Chinese Academy of Sciences, Beijing 100049, P. R. China,Tianjin Hydraulic Research Institute, Tianjin 300061, P. R. China,State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, P. R. China,State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, P. R. China,Nanjing Institute of Technology, Nanjing 211167, P. R. China and State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, P. R. China |
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| Abstract: | |
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| Keywords: | Cyanobacterial bloom sediments nutrients dissolved organic carbon algae detritus |
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