亚热带盆地中对比的气运输模式,由多种同位素分析和水文模拟相结合而揭示
Ruidong Chen1, Wanqi Shen1, Chengwei Tong1
1School of Geography and Ocean Science, Nanjing University, Nanjing, Jiangsu province, 210023, PR China.
Water research
|July 16, 2024
概括
了解河流流域中 (N) 的来源和运输是管理的关键. 这项研究揭示了城市和农业盆地的独特N模式,这对于有针对性的战略至关重要.
科学领域:
- 环境科学 环境科学
- 水文学的水文学
- 地质化学 地质化学
背景情况:
- 水生系统中的 (N) 动态对于盆地管理至关重要.
- 由于复杂的人类,气候和景观影响,人们对盆地N来源和运输的理解有限.
研究的目的:
- 为了阐明在中国亚热带季风盆地中源和运输的模式.
- 为N动态提供综合方法,将同位素和水文建模结合起来.
主要方法:
- 使用了每月的水化学和同位素数据 (18O-NO3-,15N-NO3-,18O-H2O,2H-H2O) 对于河水,地下水和降雨.
- 采用了与多个同位素集成的水文模型,用于多年盆地分析.
- 分析了来自三个不同盆地的数据:高度城市化,农业和农林混合.
主要成果:
- 流体N水平在城市盆地 (3.05 ± 1.42 mg·L-1) 中最高,干旱季度度较高.
- 由于污水处理和肥料使用,农业盆地显示的N负载比城市盆地高 (0.624-0.728 T N km-2 y-1) (0.558 T N km-2 y-1).
- 确定的主导N来源:城市盆地的肥料和污水 (46.9%),以及土壤N,肥料,以及农业和混合盆地的/污水入含水层.
结论:
- 通过使用综合多方法方法,在不同盆地类型内建立了源和运输的典型模式.
- 突出了地下水在农业和混合盆地的N运输的重要作用.
- 这些发现为制定定制的,盆地特定的管理策略提供了关键的见解.
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