春季大亚湾海域沉积物-海水界面营养盐的交换速率  

Exchange rates of nutrients at sediment-seawater interface in Daya Bay in spring

作　　者：何桐[1] 谢健[1] 余汉生[2] 方宏达[2] 高全洲[3] 

机构地区：[1]国家海洋局南海海洋工程勘察与环境研究院,广东广州510300 [2]国家海洋局南海环境监测中心,广东广州510300 [3]中山大学地理科学与规划学院,广东广州510275

出　　处：《海洋环境科学》2010年第2期179-183,共5页Marine Environmental Science

基　　金：国家自然科学基金(40671027);广东省自然科学基金(7003669);教育部新世纪优秀人才支持计划基金(NCET)

摘　　要：2007年4月应用实验室培养法研究了大亚湾海域沉积物-海水界面营养盐的交换速率（v）和交换通量（F），并与间隙水分子扩散模型计算结果进行了对比。结果表明，vDIN变化范围为304．21～441．92μmol／m^2·d，平均为368．05μmol／m^2·d，vPO4-P变化范围为27，08～110．21μmol／m^2·d，平均为48．64μmol／m^2·d，vSiO3-Si变化范围为1878．10～6024．40μmol／m^2·d，平均为3653．84μmol／m^2·d。与间隙水分子扩散模型计算结果相比较，两者之间存在数量级的差异。产生差异的原因在于，间隙水分子扩散模型在浅水海湾中应用时没有考虑到沉积物底栖生物活动以及风浪扰动等因素的影响。大亚湾海域春季FDIN／SE为2．03×10^7mol，FPO4-Pi/SE为2．68×10^6mol，FSiO3-Si/SE为2．02×10^8mol，为维持大亚湾春季的初级生产力，沉积物交换过程可提供约10％的DIN、21％的PO4-P和98％的SiO3-Si。The exchange rates and benthic fluxes of nutrients at the sediment-seawater interface in Daya Bay were measured by the incubation experiments, and compared with the interstitial water molecular diffusive model. The results show that the exchange rates of the three macro-nutrients varied from 304.21 - 441.92,27.08 - 110.21 and 1878.10 - 6024.40 μmoL/m^2·d for DIN, POa-P and SiO3-Si respectively. The average exchange rates of the three macro-nutrients were 368.05,48.64 and 3653.84 μmol/m^2 ·d for DIN, PO4-p and SiO3 -Si respectively. Compared with the molecular diffusive model, the value differences might as high as an order of magnitudes. The difference origin has the relation to the molecular diffusive model, which was not considered the affection of benthic bio-disturbance and wind and wave disturbance. Furthermore, the exchange fluxes of the macro-nutrients throughout spring in Daya Bay were calculated to be 2.03 × 10^7 for DIN,2.68× 10^6 for PO4-P,and 2.02 × 10^8 mol for SiO3-Si. The nutrients contribution from the sediment accounted for 10% of DIN,21% of PO4-P and 98% of SiO3-Si demanded to maintain the primary productivity of the Daya Bay in spring.

关 键 词：沉积物-海水界面 营养盐 交换速率 通量 大亚湾 

分 类 号：P734.4[天文地球—海洋化学]