摘要
基于2002年4、7、11月及2003年2月长江口滨岸潮滩采集的4个点位的柱状沉积物样品，对典型剖面孔隙水中氨态氮和磷酸盐含量的分析测定表明，孔隙水中氨态氮的浓度范围为0．04～16．87mg／L，最高浓度基本都出现在春季；而总可溶磷的浓度为0．01～0．37mg／L，其中大部分的浓度随深度的增加而逐渐升高。通过对长江口滨岸潮滩典型剖面孔隙水中氨态氮和磷酸盐含量变化的综合分析，探讨了研究区域内沉积物的早期成岩作用，并建立早期成岩作用下沉积物孔隙水中氨态氮和磷酸盐的“扩散-平流-反应”模型。研究发现孔隙水中氨态氮地球化学过程主要受有机质分解和粘土矿物的吸附反应控制，而磷酸盐的转移反应主要受有机磷分解、磷酸盐吸附和沉淀的控制。二者反应均遵循一级动力学。
The distributions of NH4^＋-N and PO4-P in cores of sediments in the Yangtze estuarine and coastal tidal were studied in detail in this paper. The core sediments from 4 stations were collected in the Yangtze estuarine and coastal tidal flat in April, July, November 2002 and February 2003. The concentrations of NH4^＋-N were in the range of 0.04 to 16.87 mg/L, and the most peak concentrations were occurred in spring. The ones of PO4-P were from 0.01 to 0.37 mg/L, and many of them became increased with the increase of depth. The changes of NH4^＋-N and PO4-P in typical interstitial water profiles and the early diagenesis of the sediments in the Yangtze estuarine and coastal tidal flat were also studied. The early diagenetic model of PO4-P in typical interstitial water profile showed that organic matters decomposition, PO4-P adsorption and precipitation were fitted to the first-order kinetics, which controlled the transfer reaction of PO4-P in the pore water. The early diagenetic model of NH4^＋-N in typical interstitial water profiles showed that the geochemical process during early diagenesis was mainly controlled by organic matter decomposition and clay mineral adsorption, which also followed first-order kinetics.
出处
《长江流域资源与环境》
CAS
CSSCI
CSCD
北大核心
2007年第A02期90-95,共6页
Resources and Environment in the Yangtze Basin
基金
国家自然科学基金（40671171）
关键词
长江口
氨态氮
磷酸盐
早期成岩模型
the Yangtze estuary
NH4^＋-N
PO4-P
early diagenetic model
