长江河和相关主要支流的营养物质的空间和历史变化
Qiuxun Lin1, Zhenyang Song2, Mengting Qi3
1State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai, 200241, China; Hainan Institute, East China Normal University, Sanya, 572000, China.
Water research
|December 15, 2025
概括
长江河中的营养水平 (溶解的无机,和) 在过去40年里发生了显著的变化. 人类活动和水建设增加了和,但减少了,影响了河水质量.
科学领域:
- 环境科学 环境科学
- 河流生态 河流生态
- 水质管理水质管理
背景情况:
- 大河是受人类活动和全球变化影响的关键生态系统.
- 了解河流的空间和历史营养动态对于有效管理至关重要.
- 长江河是全球主要的水道,面临着巨大的人为压力.
研究的目的:
- 研究和总结长江及其支流中营养物质 (溶解无机 - DIN,溶解无机 - DIP,溶解 - DSi) 的度和流量.
- 分析营养比例的空间和时间趋势及其与人类活动和水建设的关系.
- 量化过去四十年营养流量的变化,并确定有助于变化的因素.
主要方法:
- 收集和分析了来自长江河和八条主要支流的DIN,DIP和DSi度和流量的数据.
- 检查了从上游到下游的营养度的空间变化.
- 与历史数据,三峡大 (TGD) 建设以及农业活动和污水排放等人为因素相关的营养趋势和比例.
主要成果:
- DIN和DIP度从上游增加到下游,而DSi度在下游最高.
- 营养成分比率 (DIN/DSi,DIN/DIP,DSi/DIP) 从水源到河口发生了显著的变化,在TGD建设后显著增加.
- 由于农业和家庭污染,每年的DIN和DIP流量显著增加 (1980-2020),而DSi流量减少,与森林植被和TGD减少的悬浮沉积物有关.
结论:
- 人类活动,特别是农业肥料使用和城市扩张,已经大大增加了长江河的DIN和DIP载荷.
- 高速公路的建设和植树项目导致了DSi负载的显著减少.
- 长江河的营养比例和运输动态深受人类活动,水建设和环境政策的结合的影响.
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