减弱的水文振荡周期增加了河藻繁殖的频率
Qiang Hu1, Yan Chen2, Rui Xia3
1State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, PR China.
Water research
|April 2, 2024
概括
汉河频繁的藻类开花与长期的水文变化有关. 减弱的长期水文振荡周期 (HOP) 显著增加了开花频率,影响了河流生态.
科学领域:
- 河流生态 河流生态
- 水文学的水文学
- 水资源管理水资源的管理.
背景情况:
- 河流生态系统表现出累积,持久和歇斯底里特征.
- 河流生态对长期水文波动的非线性反应给研究带来了挑战.
- 汉河下游频繁的藻类繁殖是一个问题,因盆地间的水分转移而加剧.
研究的目的:
- 调查汉河下游的非线性生态水文反应.
- 为了确定水文波动和藻类繁殖形成之间的关系.
- 为优化生态管理策略提供见解.
主要方法:
- 连续波段变换 (CWT) 和反向波段变换 (IWT) 的集成.
- 在过去半个世纪的水文制度和振荡的分析.
- 液态AC间变化与藻类繁殖频率之间的相关性分析.
主要成果:
- 50年来,汉河下游的水文制度出现了显著的下降趋势.
- 确定三种水文振荡周期 (HOP):内交流 (180天),交流 (365天) 和交流间交流 (2500天).
- 跨AC变异显示了最显著的变化,与藻类繁殖形成密切相关;弱化的跨AC与繁殖频率增加相关 (60年跨AC累积增加10%).
结论:
- 河流藻类的开花是长期水文影响的累积结果.
- 减弱的长时间水文振荡周期 (HOP) 显著增加了河藻繁殖的频率.
- 研究结果为优化大规模水资源保护框架中的生态管理提供了关键的见解.
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