一个沿海水产养殖湾的海底地下水(淡水和盐水)营养输入与富营养化之间的潜在联系

IF 3.3 2区 地球科学 Q1 OCEANOGRAPHY Journal of Geophysical Research-Oceans Pub Date : 2024-10-24 DOI:10.1029/2024JC021501
Cheng Xu, Xilong Wang, Fenfen Zhang, Yanlin Lao, Jianan Liu, Jinzhou Du
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引用次数: 0

摘要

海底地下水排放(SGD)在沿岸系统的养分预算中起着至关重要的作用,包括海底淡水地下 水排放(SFGD)和再循环含盐地下水排放(RSGD)。尽管其意义重大,但这些成分在海水养殖海湾中的具体重要性尚未得到全面评估。在此,我们利用镭同位素和水盐质量平衡模型表明,SFGD 通量(1.1 ± 0.4 cm d-1)仅占中国南海沿岸典型海水养殖海湾--镇珠湾 SGD 的 17%。有趣的是,SFGD 的营养贡献超过了 RSGD,占 SGD 中溶解无机氮通量的 82%。对月度卫星叶绿素-a(Chl-a)数据的分析证实,浮游植物生物量的下降与SFGD输送的有限溶解硅酸盐(DSi)有关。此外,与 Redfield 比值相比,SFGD 的氮磷比值升高(241:1),硅氮比值降低(0.5:1),这表明 SFGD 具有氮过剩和硅缺乏的特征,这很可能在沿岸水体生物成因限制的过渡中起了作用。这种转变可能会影响浮游植物群落的比例和功能,从而有可能缓解水体富营养化。这些发现凸显了藻类富营养化对珍珠湾营养动态和生态环境的重要影响。
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Potential Linkages Between Submarine Groundwater (Fresh and Saline) Nutrient Inputs and Eutrophication in a Coastal Aquaculture Bay

Submarine groundwater discharge (SGD) plays a crucial role in nutrient budgets of coastal systems, encompassing both submarine fresh groundwater discharge (SFGD) and recirculated saline groundwater discharge (RSGD). Despite its significance, the specific importance of these components in mariculture bays has not been thoroughly assessed. Here, utilizing Ra isotopes and water-salt mass balance model, we show that SFGD flux (1.1 ± 0.4 cm d−1) represented only 17% of the SGD in the Zhenzhu Bay, a typical mariculture bay along the South China Sea. Interestingly, the nutrient contribution from SFGD surpassed that from RSGD, accounting for 82% of the dissolved inorganic nitrogen (DIN) flux within the SGD. Analysis of the monthly satellite Chlorophyll-a (Chl-a) data confirmed that the decline in phytoplankton biomass can be linked to the limited dissolved silicate (DSi) transported by SFGD. Additionally, the elevated nitrogen to phosphorus ratio (241:1) and reduced silicon to nitrogen ratio (0.5:1) in SFGD compared to the Redfield ratio suggested that SFGD characterized by nitrogen excess and silica deficient, which likely played a role in transitioning from biogenic element constraints in coastal water. This shift may impact the proportions and functionality of the phytoplankton community, potentially mitigating water eutrophication. These findings underscore the significant influence of SGD on nutrient dynamics and the ecological environment in the Zhenzhu Bay.

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来源期刊
Journal of Geophysical Research-Oceans
Journal of Geophysical Research-Oceans Earth and Planetary Sciences-Oceanography
CiteScore
7.00
自引率
13.90%
发文量
429
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