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作为近海海洋系统中最大的氮储库,溶解有机氮(DON)是营养物质循环的一个重要环节,不仅可与溶解无机氮之间相互转化,且可被浮游植物直接利用利用,对近海富营养化形成具有重要贡献。本文综述了近海DON对浮游植物的生物可利用性研究进展,包括近海DON的主要化学组成和浓度分布、DON生物可利用性评价方法、浮游植物对DON的吸收利用特性以及DON丰度和构成对浮游植物种群演替的潜在影响等;并指出,系统研究DON在近海生态生态系统中迁移转化的动力学过程及其控制机制,确定DON构成与生物有效之间的耦合关系,是今后需要深入研究的问题。
As the largest nitrogen reservoir in offshore marine system, dissolved organic nitrogen (DON) is an important part of nutrient circulation. It can not only transform into dissolved inorganic nitrogen, but also can be directly utilized by phytoplankton. The formation of an important contribution. This review summarizes the recent advances in bioavailability of phytoplankton by coastal DON, including the major chemical compositions and concentrations of DON in coastal waters, the bioavailability of DON, the absorption and utilization of DON by phytoplankton, and the abundance and composition of DON And the potential impact of phytoplankton population succession. It is pointed out that the systematic study of the kinetics of DON transport and transformation in coastal ecosystems and its control mechanisms and the determination of the coupling between DON composition and bioavailability are necessary to further study The problem.