鄱阳湖网箱养殖区沉积物有机质来源分析  

Sources of sedimentary organic matter from the cage fish farm in Lake Poyang,China

作　　者：王毛兰 熊鑫 何昶 赵茜宇 刘景景 Wang Maolan;Xiong Xin;He Chang;Zhao Qianyu;Liu Jingjing(The Key Laboratory of Poyang Lake Environment and Resource Utilization Ministry of Education,School of Resources Environmental and Chemical Engineering,Nanchang University,Nanchang 330031,P.R.China)

机构地区：[1]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330031

出　　处：《湖泊科学》2021年第1期158-167,共10页Journal of Lake Sciences

基　　金：国家自然科学基金项目(41663004);国家水体污染控制与治理科技重大专项(2017ZX07301002-05);南昌大学鄱阳湖环境与资源利用教育部重点实验室开放基金项目(PYH2015-02)联合资助.

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)含量、总氮(TN)含量、碳氮比(C/N)、δ^13 C及δ^15 N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,网箱养殖区沉积物的δ^13 C和δ^15 N值分别为-27.67‰~-25.65‰和5.19‰~7.27‰,饵料的δ^13 C和δ^15 N值分别为-24.73‰和10.28‰,鱼粪的δ^13 C和δ^15 N值分别为-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,网箱养殖源有机质的扩散距离达1500 m.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.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 Lake Poyang.The origins of the sedimentary organic matter were analyzed using the carbon and nitrogen isotope compositions and C/N ratios.The results showed that theδ^13 C andδ^15 N values of sediments ranged from-27.67‰to-25.65‰and from 5.19‰to 7.27‰,respectively.Theδ^13 C values of waste feed and fish feces were-24.73‰and-26.30‰,respectively.And theδ^15 N 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 mixed 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 1500 m 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 Lake Poyang.

关 键 词：网箱养殖 碳同位素 氮同位素 沉积物 鄱阳湖 

分 类 号：X52[环境科学与工程—环境工程]