Nutrient dynamics in the East China Sea: Seasonal changes, budget, and ecological impacts

IF 3.8 3区地球科学 Q1 OCEANOGRAPHY

Progress in Oceanography Pub Date : 2025-03-09 DOI:10.1016/j.pocean.2025.103463

Xiaosong Zhong , Jiaming Liu , Mengjiao Shi , Xiaotian Liu , Zongqing Lv , Xiangbin Ran

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Abstract

The continental seas have experienced significant eutrophication due to intensified anthropogenic activities. This study aims to elucidate the processes that govern the budgets of dissolved inorganic nitrogen (DIN), dissolved inorganic phosphorus (DIP), and dissolved silicate (DSi) in the East China Sea (ECS). Key nutrient sources include terrestrial runoff, atmospheric deposition, water column regeneration, and Kuroshio Current (KC) intrusions, jointly influencing the concentrations, distribution, and stoichiometry of nutrients in the ECS. Diffusion at the sediment–water interface contributes over 30% of DIN input, while the KC and the Taiwan Warm Current dominate inputs of DIP (69.1%) and DSi (66.3%), respectively. In contrast, riverine inputs, accounting for 12.3% of DIN and 4.73% of DIP, primarily affect nearshore surface waters and have minimal influence offshore. The distinct sources and cycling processes of DIN, DIP, and DSi lead to imbalanced nutrient stoichiometry in the ECS. This imbalance is further exacerbated by the disparity between nutrient regeneration and primary production. This study highlights the need for effective nutrient management to mitigate negative ecological consequences in the ECS.

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东海的营养动态：季节变化、预算和生态影响

由于人类活动的加剧，大陆海经历了显著的富营养化。本研究旨在阐明东海（ECS）溶解无机氮（DIN）、溶解无机磷（DIP）和溶解硅酸盐（DSi）的收支控制过程。主要的营养源包括陆地径流、大气沉积、水柱再生和黑潮入侵，它们共同影响东太平洋营养物的浓度、分布和化学计量学。沉积物-水界面扩散贡献了超过30%的DIN输入，而KC和台湾暖流分别占DIP输入的69.1%和DSi输入的66.3%。相比之下，河流输入占DIN的12.3%和DIP的4.73%，主要影响近岸地表水，对近海的影响最小。DIN、DIP和DSi的不同来源和循环过程导致ECS营养化学计量失衡。养分再生和初级生产之间的差异进一步加剧了这种不平衡。这项研究强调了有效的营养管理的必要性，以减轻ECS的负面生态后果。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Progress in Oceanography 地学-海洋学

CiteScore

7.20

自引率

4.90%

发文量

138

审稿时长

3 months

期刊介绍： Progress in Oceanography publishes the longer, more comprehensive papers that most oceanographers feel are necessary, on occasion, to do justice to their work. Contributions are generally either a review of an aspect of oceanography or a treatise on an expanding oceanographic subject. The articles cover the entire spectrum of disciplines within the science of oceanography. Occasionally volumes are devoted to collections of papers and conference proceedings of exceptional interest. Essential reading for all oceanographers.