人类和自然活动调节了中国河流中的有机物运输
Dong Liu1, Xintong Jiang2, Mengwei Duan3
1Key Laboratory of Watershed Geographic Sciences, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China; State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China; Faculty of Natural Sciences, University of Stirling, Stirling FK9 4LA, UK.
Water research
|September 16, 2023
概括
河流有机物,以化学氧气需求 (COD) 来衡量,在中国各地的空间和季节性变化. 人类活动,特别是农业,显著影响COD水平,突出了需要有效的水生环境管理.
科学领域:
- 环境科学 环境科学
- 生态生态学 生态生态学
- 水文学的水文学
背景情况:
- 河流是从陆地到水中运输碳的关键管道,影响全球碳预算.
- 有限的高频数据阻碍了对河流碳运输的日间和季节性变化的理解.
- 化学氧气需求 (COD) 作为河流有机物质含量的指标.
研究的目的:
- 调查中国各地河流有机物 (用COD表示) 的时空变化.
- 确定影响这些变化的驱动因素,包括人类活动和自然因素.
- 评估对水生环境管理和全球碳预算估计的影响.
主要方法:
- 在2021年3月至2022年2月期间,利用来自中国各地1491个监测站的COD每日测量.
- 分析了COD含量和流量的空间模式和季节性趋势.
- 采用统计方法来确定人类活动和自然因素对观察到的变化的贡献.
主要成果:
- 中国西北部的COD含量最高,流量与水排放有很强的相关性 (84.01%).
- 人类活动,特别是农业种植,显著解释了COD的空间变化 (73.20%).
- 大多数车站都表现出显著的季节性COD变化,II (III) 型车站在夏季 (秋季) 达到峰值 (底部),受温度,降水和藻类开花的影响.
结论:
- 季节性测量对于准确的河流有机物运输估计至关重要,特别是在春季和冬季.
- 了解空间时间COD动态对于有效的水生环境管理至关重要.
- 这些发现有助于更好地了解河流碳出口和全球碳循环.
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