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IF 11.4 1区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Water Research Pub Date : 2025-02-22 DOI:10.1016/j.watres.2025.123370

Xinyu Li , Cui Zeng , Xiurong Han , Liqiang Fan , Jing Zhao , Yingzhe Wang , Xiulin Wang , Keqiang Li

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引用次数: 0

摘要

大量溶解有机氮（DON）从莼菜绿潮中进入海水，影响黄海浮游植物群落结构。实地调查和培养实验揭示了莼菜衍生 DON 的老化调控作用。南黄海绿潮爆发区呈现出一个季节性周期，从夏季到春季，在源于 U. prolifera 的 DON 从幼年到老化的影响下，优势从硅藻转向甲藻。在夏季绿潮爆发后，硅藻的丰度明显上升，这主要是受到增殖藻释放的富含蛋白质的年轻 DON 的影响。经过秋冬季的老化，U. prolifera 衍生的 DON 由蛋白质类成分转变为腐殖质类成分，并在绿潮爆发区盛开甲藻。通过对Chaetoceros curvisetus和Prorocentrum minimum的老化U. prolifera衍生DON添加培养实验证明，老化和年轻的DON分别促进甲藻和硅藻的生长。硅藻更喜欢含有酪氨酸 B 和色氨酸 T 成分的 0 天龄和 12 天龄 DON（DON0 和 DON12），而甲藻更喜欢含有腐殖酸 E 和紫外富勒酸 A 成分的 80 天龄 DON（DON80）。在低亮氨酸氨基肽酶（LAP）条件下，硅藻吸收 DON0 和 DON12 的吸收常数（kup）和生长常数（kG）均高于甲藻。在 LAP 浓度较高的条件下，甲藻吸收旧 DON 的 kup 和 kG 值均高于硅藻。这与绿潮爆发区硅藻甲藻的季节性演替中源于 U. prolifera 的 DON 循环相一致。该研究揭示了季节性甲藻-U. prolifera-硅藻循环的机制，为了解 U. prolifera 绿潮对浮游植物系统转变的影响提供了新的视角，从而为制定海洋管理策略提供依据。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

The effect of the aging processes of Ulva prolifera-derived dissolved organic nitrogen associated with green tide on the diatoms-dinoflagellates succession in the Southern Yellow Sea, China

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The effect of the aging processes of Ulva prolifera-derived dissolved organic nitrogen associated with green tide on the diatoms-dinoflagellates succession in the Southern Yellow Sea, China

Multitudinous dissolved organic nitrogen (DON) enters seawater from Ulva prolifera green tides impacting phytoplankton community structure in the Yellow Sea. Field investigations and cultural experiments on U. prolifera-derived DON aging revealed its regulatory effects. The green-tide outbreak area of the Southern Yellow Sea exhibits a seasonal cycle where dominance shifts from diatoms to dinoflagellates effected by young to aging U. prolifera-derived DON from summer to spring. Diatom abundance rose significantly following the summer green tide outbreak, fueled by young, protein-rich DON released by U. prolifera. After autumn and winter aging, U. prolifera-derived DON was dominant from protein-like to humic-like components, and dinoflagellates bloomed in the green tide outbreak area. An aging U. prolifera-derived DON adding culture experiment of Chaetoceros curvisetus and Prorocentrum minimum proved that old and young DON promoted dinoflagellate and diatom growth, respectively. Diatoms preferred 0 and 12 days-aged DON (DON₀ and DON₁₂) with tyrosine B and tryptophan T components, whereas dinoflagellate favored 80 days-aged DON (DON₈₀) with humic acid E and UV fulvic acid A components. DON₀ and DON₁₂ can be absorbed by diatoms with higher uptake (k_up) and growth (k_G) constants than by dinoflagellates under low leucine aminopeptidase (LAP) conditions. Dinoflagellates absorb old DON with higher k_up and k_G values under higher LAP concentrations than diatoms. This was consistent with the loop of U. prolifera-derived DON turning over the seasonal succession of diatom dinoflagellates in the green-tide outbreak area. This study revealed mechanism of seasonal dinoflagellate-U. prolifera-diatom cycle, and provided new insights for impacts of U. prolifera green tides on phytoplankton regime shift, thus, acting as a basis for marine management strategies.

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来源期刊

Water Research 环境科学-工程：环境

CiteScore

20.80

自引率

9.40%

发文量

1307

审稿时长

38 days

期刊介绍： Water Research, along with its open access companion journal Water Research X, serves as a platform for publishing original research papers covering various aspects of the science and technology related to the anthropogenic water cycle, water quality, and its management worldwide. The audience targeted by the journal comprises biologists, chemical engineers, chemists, civil engineers, environmental engineers, limnologists, and microbiologists. The scope of the journal include: •Treatment processes for water and wastewaters (municipal, agricultural, industrial, and on-site treatment), including resource recovery and residuals management; •Urban hydrology including sewer systems, stormwater management, and green infrastructure; •Drinking water treatment and distribution; •Potable and non-potable water reuse; •Sanitation, public health, and risk assessment; •Anaerobic digestion, solid and hazardous waste management, including source characterization and the effects and control of leachates and gaseous emissions; •Contaminants (chemical, microbial, anthropogenic particles such as nanoparticles or microplastics) and related water quality sensing, monitoring, fate, and assessment; •Anthropogenic impacts on inland, tidal, coastal and urban waters, focusing on surface and ground waters, and point and non-point sources of pollution; •Environmental restoration, linked to surface water, groundwater and groundwater remediation; •Analysis of the interfaces between sediments and water, and between water and atmosphere, focusing specifically on anthropogenic impacts; •Mathematical modelling, systems analysis, machine learning, and beneficial use of big data related to the anthropogenic water cycle; •Socio-economic, policy, and regulations studies.