Jin Haoyu, Zhang Chao, Meng Siyu, Wang Qin, Ding Xiaokun, Meng Ling, Zhuang Yunyun, Yao Xiaohong, Gao Yang, Shi Feng, Mock Thomas, Gao Huiwang
Frontiers Science Center for Deep Ocean Multispheres and Earth System, and Key Laboratory of Marine Environment and Ecology, Ministry of Education of China, Ocean University of China, Qingdao, 266100, China.
Marine Ecology and Environmental Science Laboratory, Laoshan Laboratory, Qingdao, 266071, China.
Nat Commun. 2024 Jan 30;15(1):658. doi: 10.1038/s41467-024-44838-7.
In coastal seas, the role of atmospheric deposition and river runoff in dissolved organic phosphorus (DOP) utilization is not well understood. Here, we address this knowledge gap by combining microcosm experiments with a global approach considering the relationship between the activity of alkaline phosphatases and changes in phytoplankton biomass in relation to the concentration of dissolved inorganic phosphorus (DIP). Our results suggest that the addition of aerosols and riverine water stimulate the biological utilization of DOP in coastal seas primarily by depleting DIP due to increasing nitrogen concentrations, which enhances phytoplankton growth. This "Anthropogenic Nitrogen Pump" was therefore identified to make DOP an important source of phosphorus for phytoplankton in coastal seas but only when the ratio of chlorophyll a to DIP [Log (Chl a / DIP)] is larger than 1.20. Our study therefore suggests that anthropogenic nitrogen input might contribute to the phosphorus cycle in coastal seas.
在沿海水域，大气沉降和河流径流在溶解有机磷（DOP）利用中的作用尚未得到充分了解。在此，我们通过将微观实验与一种全球方法相结合来填补这一知识空白，该方法考虑了碱性磷酸酶活性与浮游植物生物量变化之间的关系，以及与溶解无机磷（DIP）浓度的关系。我们的结果表明，添加气溶胶和河水主要通过因氮浓度增加而消耗DIP来刺激沿海水域中DOP的生物利用，这会促进浮游植物生长。因此，这种“人为氮泵”被确定为使DOP成为沿海水域浮游植物重要的磷源，但前提是叶绿素a与DIP的比值[Log（Chl a / DIP）]大于1.20。因此，我们的研究表明人为氮输入可能有助于沿海水域的磷循环。
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