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Updated: Jan 12, 2026

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追踪长江河口的气动态:原因和影响

Mengjiao Shi¹, Xiaosong Zhong¹, Zongqing Lv¹

¹Marine Ecology Research Center, First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China.

Journal of environmental sciences (China)

|November 2, 2025

概括

长江河口的含量正在下降,原因是河流输入量减少和植物浮游生物吸收增加. 这种耗损影响了与的比率,并可能影响河口生态系统.

科学领域:

河口生物地质化学
营养物质动态营养物质动态
环境科学环境科学

背景情况:

(P) 对于初级生产至关重要,并且经常限制河口产能.
长江河口面临着由于人类活动而改变的营养动态.
最近从长江河中减少的P载荷需要了解溶解无机 (DIP) 变化.

研究的目的:

调查江河口溶解无机 (DIP) 度变化的驱动因素.
分析减少河流输入对河口营养动态的影响.
评估DIP的长期趋势和时空变化.

主要方法:

对2017年,2019年和2023年的DIP数据进行分析.
与历史河口数据集的整合.
空间时间变化和DIP度趋势的统计分析.

主要成果:

DIP度显示出显著的时空变化,在冬季达到峰值.
DIP表现出非保守的行为,是由沿盐度梯度的生物利用驱动的.
长期数据显示,自2015年以来DIP趋势下降 (0.024μmol/L·年),表明耗尽.

结论:

减少河流P负荷和增加浮游植物固定是河口P耗尽的关键驱动因素.
由于DIP的减少,观察到与的比例发生了变化.
持续的营养管理可能会进一步降低DIP,可能会影响江河口的生态系统.

关键词:

长江河口长江河口长期变化长期变化是一种的物质.河流输入的河流输入.

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相关概念视频

The Phosphorus Cycle

The Phosphorus Cycle

Unlike carbon, water, and nitrogen, phosphorus is not present in the atmosphere as a gas. Instead, most phosphorus in the ecosystem exists as compounds, such as phosphate ions (PO43-), found in soil, water, sediment and rocks. Phosphorus is often a limiting nutrient (i.e., in short supply). Consequently, phosphorus is added to most agricultural fertilizers, which can cause environmental problems related to runoff in aquatic ecosystems.

Primary Production

Primary Production

The total amount of energy acquired by primary producers in an ecosystem is called gross primary production (GPP). However, of this energy, producers use some for metabolic processes, and some is lost as heat, decreasing the amount of energy available to the next trophic level. The remaining usable amount of energy is called the net primary productivity (NPP). In terrestrial ecosystems, NPP is driven by climate, while light penetration and nutrient availability drive NPP in aquatic ecosystems.