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鄱阳湖网箱养殖区沉积物有机质来源分析
王毛兰, 熊鑫, 何昶, 赵茜宇, 刘景景
南昌大学资源环境与化工学院,鄱阳湖环境与资源利用教育部重点实验室,南昌 33003
摘要:
通过对鱼苗时期鄱阳湖网箱养殖区沉积物、饵料及鱼粪等样品总有机碳(TOC)、总氮(TN)、C/N、δ13C及δ15N含量的测定,分析探讨了鄱阳湖网箱养殖区沉积物有机质来源,量化了网箱养殖废物对养殖区沉积物有机质的贡献。结果表明,网箱养殖区沉积物δ13C和δ15N值分别为-27.67‰~-25.65‰、5.19‰~7.27‰,饵料和鱼粪δ13C和δ15N值分别为-24.73‰和10.28‰、-26.30‰和15.54‰。网箱养殖区沉积物有机质来源主要有残饵、浮游生物及其他来源,其贡献率分别为48.3±11.4%、25.6±11.3%及26.0±5.8%,而鱼粪的贡献几乎可以忽略不计。在水动力平流引起的扩散及沉积物的再悬浮的影响下,网箱养殖源有机质扩散距离能达1.5km。在鱼苗时期,鱼类网箱养殖的残饵是鄱阳湖网箱养殖区沉积物有机质的主要来源。
关键词:  网箱养殖  碳同位素  氮同位素  沉积物  鄱阳湖
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Sources of sedimentary organic matter from the cage fish farm in Poyang Lake
Wang Maolan, Xiong Xin, He Chang, Zhao Qianyu, Liu Jingjing
School of Resources Environmental and Chemical Engineering, The Key Laboratory of Poyang Lake Environment and Resource Utilization Ministry of Education, Nanchang University
Abstract:
The content of total organic carbon (TOC), total nitrogen (TN), the C/N ratio and the carbon and nitrogen stable isotope compositions of the sedimentary organic matter, fish feed and fish feces were measured from the cage fish farm in Poyang Lake. The origins of the sedimentary organic matter were analyzed using the carbon and nitrogen isotope compositions and C/N ratios. The results showed that the δ13C and δ15N values of sediments ranged from -27.67‰ to -25.65‰ and from 5.19‰ to 7.27‰, respectively. The δ13C values of waste feed and fish feces were -24.73‰ and -26.30‰, respectively. And the δ15N values of waste feed and fish feces were 10.28‰ and 15.54‰, respectively. The sedimentary organic matter of the cage fish farm had a mix source of waste feed, plankton and the other organic matter. The mean proportions of the waste feed, plankton and the other organic matter were 48.3±11.4%, 25.6±11.3% and 26.0±5.8%. The contribution of fish feces to the sedimentary organic matter pool was insignificant. The waste feed seemed to disperse about 1.5km distance from the cage under the influence of the dispersion and resuspension. During the period of fry, the waste feed of cage fish culture was the main source of the sedimentary organic matter in the cage fish farm area of Poyang Lake.
Key words:  Cage fish culture  Carbon isotope  Nitrogen isotope  Sediment  Poyang Lake
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