摘要
2005年春季（4月）时珠江口内6个站住的营养盐剖面分布及沉积物-水界面的交换通量进行了全面研究。在获取该海域沉积物间隙水营养盐剖面资料的基础上，估算了沉积物-水界面营养盐的交换通量，并且与实验测定的沉积物-水界面交换通量进行了对比。研究结果表明。珠江口内间隙水营养盐在不同站位间含量差异明显，呈现出由河口向外海逐渐降低的分布趋势。对于大多数站住营养盐，交换实验得到的通量大于利用间隙水浓度梯度法估算的结果，交换实验具有更高的分辨率。应用交换实验测定的沉积物-水界面交换通量，体现了营齐盐扩散和界面反应的综合作用结果。研究区域的NH4^＋，NO3^-，NO2^-，SiO4^4-和PO4^3-的交换通量分别为-1．3184--0．9854，-0．5583～0．4692，-1.5188--0．1438，-1．9673～3．8831和-0.2464～0．0939mmol·d^-1·m^-2．
The profile distribution of nutrients and exchange fluxes at the sediment-water interface were analyzed in the six sites of the inner Pearl River Estuary in April 2005. Based on the nutrient profiles of interstitial water from the aforementioned area, the nutrients exchange fluxes at the sediment-water interface were approximately calculated, which were compared with the experimental exchange fluxes at the sediment-water interface. It is shown that the contents of nutrients in interstitial water vary a lot？ within the investigated sites, which decrease with the distance form the inner Pearl River Estuary. For most of the nutrients the measured fluxes by incubation experiments are overestimated relative to the calculated ones, which is probably due to the measured method with a higher resolution, and these are comprehensive results of nutrient diffusion and interface reaction. The exchange fluxes at the sediment-water interface of NH4^＋ , NO3^- , NO2^- , SiO4^4- and PO4^3- are -1. 3184-0. 9854 , -0. 5583-0. 4692 ,-1. 5188-0. 1438 , -1. 9673-3. 8831 and -0. 2464-0.0939 mmol · d^-1· m^-2 , respectively.
出处
《地球与环境》
CAS
CSCD
北大核心
2006年第4期1-6,共6页
Earth and Environment
基金
中国科学院知识创新工程项目(ZKCX2-SW-212)
中国科学院广州地球化学研究所领域前沿项目(GIGCX-03-07)
关键词
珠江口
营养盐
沉积物-水界面
交换通量
Pearl River Estuary
nutrient
sediment-water interface
exchange flux
