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地质论评  2005 

南黄海表层沉积物中氮的分布特征及其在生物地球化学循环中的功能

Keywords: 生物地球化学循环表层沉积物南黄海区域分布特征海洋生产力组分含量新生产力调控作用细粒度形态埋藏

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Abstract:

本文报道了南黄海表层沉积物中不同形态氮的区域分布特征及其在生物地球化学循环中的作用。结果显示,在粒径<31μm的粒度组分含量>65%()、35%~65%()和<35%()的三个区域中,沉积物中不同形态氮的含量比值分别为:1.65:1.26:1(IEF-N),1.23:1.10:1(WAEF-N),1.41:1.04:1(SAEF-N),2.08:1.45:1(SOEF-N),TN(1.70:1.26:1),即在细粒度组分(<31μm)含量较高的区域,不同形态氮的含量也相对较高;在三个分区内,不同形态氮的埋藏通量非常相近,而埋藏效率自至区逐渐递增,在细粒度组分(<31μm)含量最低的区内,埋藏效率最高,TN的埋藏效率可达30.21%,即南黄海表层沉积物中70%以上的氮在适当的条件下可释放进入水体参与其生物地球化学循环,能提供海洋新生产力所需氮的6.54%,对海洋生产力具有一定的补充和调控作用。

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