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降雨事件对亚热带城市水库中溶解氧度的影响

Anqi Luo¹, Huihuang Chen¹, Xiaofei Gao²

¹Aquatic EcoHealth Group, Fujian Key Laboratory of Watershed Ecology, Key Laboratory of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China; University of Chinese Academy of Sciences, Beijing, 100049, China.

Environmental research

|December 8, 2023

概括

人类的营养投入正在推动城市水库的长期溶解氧 (DO) 减少. 降雨和温度等气象因素影响短期的DO变化,影响渔业和温室气体排放.

科学领域:

环境科学环境科学
临界技术临界技术
水质管理水质管理

背景情况:

溶解氧 (DO) 对水生生态系统至关重要,并影响来自水库的温室气体排放.
湖泊和水库中DO水平的下降与气候变化和人类活动有关,区域差异很大.
了解DO动态对于渔业管理和准确的气候变化报告至关重要.

研究的目的:

调查一个亚热带城市水库中溶解氧 (DO) 度的长期和短期驱动因素.
评估气象条件和人为因素对DO变异性的影响.
为保持水质的水库管理策略提供信息.

主要方法:

利用来自中国兴林旺水库的六年高频数据集 (2016-2021年).
采用多变量自适应回归分线 (MARS) 模型来识别关键的长期DO驱动因素.
应用部分最小平方路径模型 (PLS-PM) 来分析不同天气时期的短期DO关系.

主要成果:

从2016年到2021年,DO度的长期下降被观察到,主要是由于人为营养投入.
雨季通过改变藻类生物质和营养度间接减少了DO,其影响因降雨持续时间而异.
在干旱期间,水温是DO的关键因素,而风通过减少藻类生物质对DO产生负面影响.

结论:

人为营养素和有机物投入是城市亚热带水库中长期DO枯竭的主要驱动因素.
短期的DO变化受到气象因素的重大影响,包括温度和降雨.
有效的水库管理需要解决长期污染源和短期与天气有关的对DO的影响.

关键词:

气候变化气候变化气候变化氧气过低是因为缺氧.降水量降水量降水量亚热带地区的水库.城市化的城市化.

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