闽江口无机氮营养盐的行为及入海通量

Estuary Chemistry of Inorganic Nitrogenous Nutrients in the Ming River

在河海水混合过程中,由于环境的剧烈改变,发生了一系列复杂的氧化还原,吸附、脱附、生物吸收及降解过程。氮等营养要素是海洋初级生产力的基础,在海洋生物地球化学中起着重要的作用,所以有必要研究氮等营养盐在河口区域的行为。闽江是福建第一大河,流域广阔,流量较大,所携带入海的营养盐是形成闽东、闽北渔场的基本条件之一。

In Oct. 1986, when the runoff was the lowest and phytoplakton was decling, the estuary chemistry of nutrients was dominated by chemical processes. NO2- possessed removal behavior. NO3+ possessed additionl behavior. In low salinity NH4+ showed removal while in high salinity NH4+ showed addition, totally NH4+ appeared to be buffered and conservative. In June 1986, when the runoff was the highest and phytoplankton was bloomig the estuary chemistry of nutri-ets was dominated by chemical and biological processes. NO2- possessed additional behavior. NH4+ appeared to be buffered and conservative In low salinity NO3+ showed biological removal. The component fluxes of the river to shelf seawater were 2. 9×104t N/a(NO3-), 3×103t N/a(NH4+),4× 102t N/a(NO2-).