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中国近海沉积物中生源要素的含量与其粒度、河流输入等诸多因素有关。一般沉积物粒度由粗到细 ,有机质含量由低到高 ,OC ,N ,P的含量递增 ,S和Si含量递减。沉积物的生物地球化学环境涉及到Eh ,pH ,温度 ,OC含量 ,Fe3 + /Fe2 + 值 ,水动力条件 ,沉积物的颗粒大小和间隙水的S体系 ,以及生物扰动等因素 ,它们影响着沉积物中生源要素的早期成岩过程和循环。一般而言 ,中国近海沉积物—海水界面S2 -,HS-,H4SiO4,PO43 -,NH4+ 的扩散通量是从沉积物向上覆水 ,而SO42 -,HCO3 -,NO3 -,NO2 -的扩散通量从上覆水向沉积物中扩散。生物扰动对沉积物—海水界面生源要素的循环起重要作用。
The contents of biogenic elements in the sediments of China offshore are related to many factors such as their grain size and river input. General sediment particle size from coarse to fine, organic matter content from low to high, OC, N, P content increased, S and Si content decreased. The biogeochemical environment of the sediments involves factors such as Eh, pH, temperature, OC content, Fe3 + / Fe2 + values, hydrodynamic conditions, sediment particle size and interstitial water S system and bioturbation, which affect Early diagenetic processes and cycles of biogenic elements in sediments. In general, the fluxes of S2 -, HS-, H4SiO4, PO43 -, and NH4 + from the sediments-seawater interface in China are diffused from sediments to overlying water while the diffusion fluxes of SO42-, HCO3-, NO3- and NO2- From the overlying water to the sediment diffusion. Bioturbation plays an important role in the cycling of biogenic elements at sediment-seawater interface.