摘要
2004年9月在胶州湾红石崖(HSY)和河套(HT)潮滩进行了沉积物—海水界面的营养盐交换通量培养实验,结果表明:D IN在胶州湾沉积物—海水界面的交换以NH4-N的扩散为主,交换方向是由上覆水向沉积物迁移,NO3-N的扩散方向与NH4-N的相反;S iO3-S i的交换和PO4-P的相似在潮滩各站位均是由上覆水向沉积物的方向迁移,表明潮滩沉积物是水体中营养盐的汇。NO2-N、NH4-N、PO4-P、S iO3-S i在沉积物—海水界面的交换通量为净吸收,分别为河流输入通量的25、7、9、2倍,但NO3-N的交换是由沉积物向海水方向,通量仅为河流输入通量的20%。潮滩沉积物—海水界面受到大量底栖动物的生理活动及其它作用的影响,因此营养盐培养实验得到的通量与利用间隙水浓度梯度法估算的结果存在明显差异。
The nutrients of the benthic fluxes were determined by incubation of sediments with overlying seawater at stations Hongshiya 1,2 and Hetao in the tidal flat of Jiaozhou Bay in Sep. 2004. The results showed that the fluxes of NH4-N were the major part in the dissolved inorganic nitrogen, and the exchange fluxes of NH4-N, SiO3-Si, PO4-P mitigated frmn the overlying water to sediment, but the fluxes of NO3 -N mitigated in an opposite direction, from the sediment to overlying water. Compared with the reverie inputs around Jiaozhou Bay, the exchange fluxes of NO2-N NH4-N, SiO3-Si, PO4-P at sediment-seawater interface were 25, 7, 9, 2 times that of the reverie inputs, the fluxes of NO3-N in an opposite direction was just 20% that of the reverie inputs. While diffusive fluxes of nutrients were calculated by Fick＇s First Law from the nutrient pore water, the profiles showed the obvious differences with the exchange fluxes measured by the incubation experiments, due to benthic fauna processes and reactions near the sediment-seawater interface.
出处
《海洋环境科学》
CAS
CSCD
北大核心
2008年第5期422-426,442,共6页
Marine Environmental Science
基金
国家自然科学基金(40206017)
国家重点基础研究发展规划(2006CB400602)
新世纪优秀人才支持计划(NCET-05-0593)
关键词
沉积物-水界面
间隙水
营养盐
胶州湾
nutrients
flux
sediment-seawater interface
pore water
Jiaozhou Bay
