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引用本文:梁越,肖化云,刘小真,李文华,熊戬.δ13C和δ15N指示不同生态类型湖泊无机氮及有机质来源.湖泊科学,2014,26(5):691-697. DOI:10.18307/2014.0506
LIANG Yue,XIAO Huayun,LIU Xiaozhen,LI Wenhua,XIONG Jian.Identifying provenance of inorganic nitrogen and organic matter in different ecotype lakes using δ13C and δ15N. J. Lake Sci.2014,26(5):691-697. DOI:10.18307/2014.0506
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δ13C和δ15N指示不同生态类型湖泊无机氮及有机质来源
梁越1, 肖化云1,2, 刘小真1, 李文华1, 熊戬1
1.南昌大学鄱阳湖环境与资源利用教育部重点实验室, 南昌 330047;2.中国科学院地球化学研究所环境地球化学国家重点实验室, 贵阳 550002
摘要:
为了探讨不同生态类型湖泊(天然湖泊、城市湖泊)中无机氮和有机质来源,分别采集湖泊中水体、表层沉积物、水生植物、底栖动物进行碳、氮同位素特征分析.结果表明:蚌湖水体δ15N-NH4+均值为-1.8‰±1.0‰,δ15N-NO3-均值为-0.5‰±1.7‰,说明蚌湖水体氮表现为雨水和农业肥料氮污染;象湖δ15N-NH4+均值为6.8‰±8.6‰,其中养殖废水和管道排污口δ15N-NH4+值分别为13.5‰和25.4‰,表现出污水氮同位素特征,象湖δ15N-NO3-均值为-2.9‰±4.2‰,是氨的硝化作用引起的氮同位素分馏所致.蚌湖表层沉积物、水生植物δ15N差别不大,分别为6.6‰±0.3‰、7.1‰±0.7‰,水生植物δ13C均值为-27.5‰±0.3‰,比沉积物δ13C偏负3‰.有机C/N为9.4±0.5,比沉积物C/N明显偏高6,反映水生植物是蚌湖有机质的主要来源.象湖表层沉积物δ15N、δ13C及有机C/N分布范围大,δ15N在3.6‰~8.3‰之间,均值为5.9‰±1.6‰,δ13C在-27.1‰~-24.7‰之间,均值为-26.0‰±1.0‰,有机C/N在2.6~10.8之间,均值为6.2±2.7,表明城市湖泊沉积有机质来源复杂.2个湖泊蚌类δ15N组成与各自湖泊表层沉积物δ15N组成相对应.
关键词:  δ13C  δ15N  湖泊  无机氮  有机质  来源  蚌湖  象湖
DOI:10.18307/2014.0506
分类号:
基金项目:国家自然科学基金项目(41263002);江西省科学技术厅项目(20123BBG70192);江西省教育厅项目(GJJ13074)联合资助
Identifying provenance of inorganic nitrogen and organic matter in different ecotype lakes using δ13C and δ15N
LIANG Yue1, XIAO Huayun1,2, LIU Xiaozhen1, LI Wenhua1, XIONG Jian1
1.Key Laboratory of Poyang Lake Environmental and Resource Utilization, Ministry of Education, Nanchang University, Nanchang 330047, P. R. China;2.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, P. R. China
Abstract:
In order to investigate nitrogen provenance in different ecotype lakes (natural or urban), samples of water, surface sediments, hydrophytes and zoobenthos in lakes were collected, and their isotopic compositions of carbon and nitrogen were measured. The results indicated that δ15N-NH4+ and δ15N-NO3- in the water of Lake Banghu were -1.8‰ ± 1.0‰ and -0.5‰ ± 1.7‰, respectively, which showed the major inorganic nitrogen from rainwater and farming fertilizer. The δ15N-NH4+ in Lake Xianghu water was high (6.8‰ ± 8.6‰), especially in fish wastewater (13.5‰) and sewage outlet (25.4‰), which showed sewage input. The δ15N-NO3- was partially negative (-2.9‰ ± 4.2‰) and showed that the nitrate nitrogen was not mainly from anthropogenic input. The δ15N of organic matters was not significantly different from that of surface sediments and hydrophyte (6.6‰ ± 0.3‰ and 7.1‰ ± 0.7‰, respectively) in Lake Banghu, so hydrophyte was the major source of organic matter for sediments. In Lake Xianghu, there were wide distributions of δ15N, δ13C and organic C/N in in the organic matters of sediments (δ15N:3.6‰-8.3‰, δ13C:-27.1‰--24.7‰, organic C/N:2.6-10.8, respectively), which implies the complexity of the sources of organic matter provenance in the urban lakes.
Key words:  δ13C  δ15N  lake  inorganic nitrogen  organic matter  provenance  Lake Banghu  Lake Xianghu
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