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引用本文:梁越,肖化云,刘小真,胡倩倩,丁新航,肖浩,杨慧慧.鄱阳湖候鸟栖息地湖泊悬浮有机质的碳氮分布及来源分析——以大湖池和沙湖为例.湖泊科学,2018,30(6):1655-1663. DOI:10.18307/2018.0617
LIANG Yue,XIAO Huayun,LIU Xiaozhen,HU Qianqian,DING Xinhang,XIAO Hao,YANG Huihui.Source and distribution of carbon and nitrogen in the suspended organic matter in the migratory bird habitat of Poyang Lake: The case study of Lake Dahuchi and Lake Shahu. J. Lake Sci.2018,30(6):1655-1663. DOI:10.18307/2018.0617
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鄱阳湖候鸟栖息地湖泊悬浮有机质的碳氮分布及来源分析——以大湖池和沙湖为例
梁越1, 肖化云1, 刘小真2, 胡倩倩1, 丁新航1, 肖浩1, 杨慧慧1
1.东华理工大学江西省大气污染成因与控制重点实验室, 核资源与环境国家重点实验室培育基地, 水资源与环境工程学院, 南昌 330013;2.南昌大学环境与化工学院, 鄱阳湖环境与资源利用教育部重点实验室, 南昌 330047
摘要:
以江西鄱阳湖国家级自然保护区的2个湖泊——大湖池和沙湖为研究对象,分析不同季节和水位悬浮有机质的碳氮稳定同位素(δ13C和δ15N)及碳氮比值(C/N)的变化特征,甄别悬浮有机质的来源.结果表明:在不同水位条件下,悬浮有机质的δ13C和δ15N均存在差异显著性.沙湖5月水位上涨时,悬浮有机质δ13C最正,均值为-26.4‰±0.9‰,10月退水后,δ13C最负,均值为-31.2‰±1.1‰.悬浮有机质δ15N值在5月和8月较低(范围为3.5‰~5.5‰),10月也相对较低,均值为6.1‰±0.6‰,而12月相对较高(7.3‰~10.8‰).悬浮有机质C/N值在10月最低,均值为6.5±0.6,小于7,与其他各月的C/N有显著差异,而其他各月C/N在7.8~8.7之间,不存在显著差异.大湖池悬浮有机质δ13C、δ15N各月的变化趋势与沙湖类似,并且两个湖泊在相同月份的δ13C、δ15N或C/N均不存在显著差异,但大湖池的δ13C和δ15N比沙湖的δ13C和δ15N均值略偏正0.1‰~0.5‰,C/N比沙湖的C/N略偏低0~0.4.有机δ13C、δ15N结合C/N示踪表明,大湖池和沙湖的悬浮有机质在5月水位上涨和8月丰水期主要来源于河流运输的土壤有机质,表层沉积物对5月悬浮有机质也有一定贡献(16%),水生浮叶植物对8月悬浮有机质有一定贡献(25%);10月秋季退水后悬浮有机质主要来源于藻类(77%),表层沉积物有一定贡献(23%);12、3和4月冬、春季枯水期悬浮有机质主要来源于表层沉积物,候鸟粪便对12月悬浮有机质有较大贡献(40%),湿地植物碎屑对3和4月有较大贡献(47%和51%).
关键词:  鄱阳湖  悬浮有机质  同位素  来源  候鸟栖息地  大湖池  沙湖
DOI:10.18307/2018.0617
分类号:
基金项目:国家自然科学基金项目(41563001)、国家重大研究与开发项目(2016YTA0601000)、东华理工大学核资源与环境国家重点实验室培育基地自主基金项目(Z1610)、东华理工大学江西省大气污染成因与控制重点实验室开放基金项目(AE1602)和东华理工大学博士科研启动金项目(DHBK2015326)联合资助.
Source and distribution of carbon and nitrogen in the suspended organic matter in the migratory bird habitat of Poyang Lake: The case study of Lake Dahuchi and Lake Shahu
LIANG Yue1, XIAO Huayun1, LIU Xiaozhen2, HU Qianqian1, DING Xinhang1, XIAO Hao1, YANG Huihui1
1.Jiangxi Province Key Laboratory of the Causes and Control of Atmospheric Pollution, State Key Laboratory Breeding Base of Nuclear Resources and Environment, School of Water Resources & Environmental Engineering, East China University of Technology, Nanchang 330013, P. R. China;2.Key Laboratory of Poyang Lake Environment and Resource Utilization, Ministry of Education, School of Resources Environmental & Chemical Engineering, Nanchang University, Nanchang 330047, P. R. China
Abstract:
We discriminated the origins of suspended organic matters in different seasons and water levels by carbon and nitrogen stable isotopes (δ13C and δ15N) and ratio (C/N) in Lake Dahuchi and Lake Shahu, national nature reserve of Poyang Lake in Jiangxi Province. The results showed that δ13C or δ15N varied in different water levels. When water level rose in May, the δ13C reached the highest value with average -26.4‰±0.9‰. In the dry season October, the δ13C has the lowest value, average -31.2‰±1.1‰. The δ15N were of lower values in flooding seasons, however relativity high values in dry seasons. The C/N in October were lowest, average 6.5±0.6 and less than 7. In other months C/N were between 7.8 and 8.7. The variation of δ13C, δ15N and C/N ratio in each month was similar between Lake Dahuchi and Lake Shahu, without significant difference. However, the δ13C and δ15N in Lake Dahuchi were more than 0.1‰-0.5‰ and C/N were lower than 0-0.4 than those of Lake Shahu. At high water levels in May and August, the suspended organic matters were mainly from soil through rivers transportation, with 16% from surface sediment in May and 25% from aquatic floating-leaved plant in August. The suspended organic matters in October were mainly from algae (77%). At lower water levels of December, March and April, the suspended organic matters were mainly from surface sediments, and the excrement of migratory bird accounted for 40% in December. The phyto-detritus in wetland accounted for 47% and 51% in March and April, respectively.
Key words:  Poyang Lake  suspended organic matter  stable isotope  origin  migratory bird habitat  Lake Dahuchi  Lake Shahu
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