[Diffusive fluxes of dissolved inorganic nitrogen across sediment-water interface in net-cage culture area of Tangdao Bay].
Abstract: On basis of field data measured during 4 cruises from August 2004 to May 2005, concentrations of NH4+ -N, NO3- -N, NO2- -N in overlying and interstitial waters of sediments in net-cage culture areas of Tangdao Bay were analyzed. Moreover, diffusive fluxes of dissolved inorganic nitrogen from sediments were estimated by Fick's first law. Results showed that the main form of inorganic nitrogen in overlying and interstitial waters of sediments was NO3- -N, accounting for 73.34% and 61.45% respectively. Concentrations distributions of dissolved inorganic nitrogen (DIN) and NO3- -N in overlying water varied seasonally, which got their maximum concentration in October 2004 while the NH4+ -N concentration showed a little difference. The seasonal change of dissolved inorganic nitrogen (DIN) and NO3- -N, NH4+ -N in interstitial water varied similarly and also got their maximum concentration in October 2004. The concentration of NO2- -N in overlying and interstitial waters increased from spring to winter. The average fluxes of NH4+ -N, NO3- -N, NO2- -N were separately 5.46, -5.04, 8.71 micromol/(m2 x d). And NO2- -N was the most diffusive flux component in net-cage culture area of Tangdao Bay.
Jiang
Zeng-jie
ZJ
Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao 266071, China. jiangzj@ysfri.ac.cn
Cui
Yi
Y
Chen
Bi-juan
BJ
D000641:Ammonia / Q000032:analysis; D000821:Animal Feed; D017756:Aquaculture / Q000295:instrumentation*; D002681:China; D017753:Ecosystem; D004784:Environmental Monitoring; D019015:Geologic Sediments / Q000737:chemistry*; D017672:Nitrogen Compounds / Q000032:analysis*; D012623:Seawater; D014872:Water Movements; D014874:Water Pollutants, Chemical / Q000032:analysis*
D017672:Nitrogen Compounds; D014874:Water Pollutants, Chemical; D000641:Ammonia