解读布水库对气运输和酸盐转化的影响:从多同位素分析和机器学习的洞察力
Yufei Bao1, Yuchun Wang1, Mingming Hu1
1State Key Laboratory of Watershed Water Cycle Simulation and Regulation, China Institute of Water Resources and Hydropower Research, Beijing 100038, China; Department of Water Ecology and Environment, China Institute of Water Resources and Hydropower Research, Beijing 100038, China.
Water research
|October 21, 2024
概括
布水库显著改变了河流动态,保留了颗粒,但释放了酸盐. 这项研究揭示了源的变化,并提供了关于河流生态系统健康的见解.
科学领域:
- 环境科学 环境科学
- 河流生态 河流生态
- 生物地质化学生物地质化学
背景情况:
- 布水库对河流营养循环和生态系统健康产生深远影响.
- 兰河 (LCR) 布系统呈现出复杂的气运输和转化动态.
- 了解这些变化对于管理河流生态系统至关重要.
研究的目的:
- 调查布水库对兰河气运输和转化的影响.
- 量化留量并确定源.
- 模拟由人为和自然因素影响的酸盐-的度.
主要方法:
- 每月在自然和水库范围进行水化和稳定同位素 (δ15N-NO3-, δ18O-NO3-, δ18O-H2O, δD-H2O) 监测.
- 对形式 (TN,NO3--N,PN,NH4+-N) 和下水的分析.
- 对N源分配的贝叶斯稳定同位素建模.
- 为NO3--N预测进行极端梯度增强 (XGBoost) 建模.
主要成果:
- 年平均保留率:TN (-35%),NO3--N (-53%),PN (48%),NH4+-N (-65%). 平均每年保留率:TN (-35%),NO3--N (-53%),PN (48%),NH4+-N (-65%). 平均每年保留率:TN (-35%),NO33-N (-53%),PN (48%),NH4+-N (-65%). 平均每年保留率:TN (-35%),NO3--N (-53%),PN (48%),NH4+-N (-65%). 平均每年保持率:
- 储水池,特别是大型储水池,增强植物浮游生物吸收NO3--N,导致下游TN和PN减少.
- 源发生了转移,土壤减少了 (69.3%至61.8%),便/污水增加了 (24.0%至31.3%).
- XGBoost模型准确地预测了NO3--N度 (R2=0.70).
结论:
- 布水库显著改变了河流运输,有利于颗粒保留比酸盐.
- 储水池中植物浮游生物的吸收在去除中起着关键作用.
- 人为因素,特别是污水,正在越来越多地导致河流气负载.
- 这项研究提高了对水库对河流生物地球化学和生态的影响的理解.
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