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地质论评  2001 

海洋沉积物―海水界面附近氮、磷、硅的生物地球化学

Keywords: 生物地球化学循环生源要素海洋沉积物海水界面氮磷硅

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Abstract:

海洋沉积物中的N和P随沉积物的粒度由粗到细,含量逐渐升高,而Si则降低;积物中N、P、Si的含量还随海区、输入源、季节、动力学过程及生物生产过程不同而变化.控制海洋沉积物-海水界面N、P、Si沉积、释放及循环的因素,包括有机质和溶解氧的浓度、有机质中C、N、P、Si的相对比例、沉积物-海水界面附近的氧化还原环境、生物扰动、温度、水深、pH值、不同形态S的浓度、金属离子以及水动力条件等.一般其综合作用的表现是,沉积物-海水界面之间NH+4、PO3-4和Si(OH)4从沉积物向上覆水扩散转移,而硝酸盐和亚硝酸盐的通量方向相反,通量的大小随着海区的不同差别较大.

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