从息地的异质性到洪水避难所:将流量强度和形态联系起来,以告知河流管理
Chantal Mariette Hischier1, Nico Bätz2, Cristina Rachelly3
1Swiss Federal Institute of Aquatic Science and Technology (Eawag), Department of Surface Waters - Research and Management, 6047, Kastanienbaum, Switzerland; Swiss Federal Institute of Technology (ETH) Zurich, Department of Environmental Systems Science, 8092, Zurich, Switzerland.
The Science of the total environment
|February 11, 2026
概括
河流恢复增强了息地异质性,增加了洪水期间水生生物的避难所可用性. 这提高了生态系统的弹性,这对于管理气候变化对河流的影响至关重要.
科学领域:
- 河流生态学 河流生态学
- 生态系统的弹性 生态系统的弹性
- 水力动力学是指水力动力学.
背景情况:
- 洪水是河流生态系统的关键干扰,在异质息地中创造避难所,支持水生生物并保持河流的弹性.
- 避难所对于生态系统的稳定至关重要,但在修复息地异质性减少的人类改造河流时经常被忽视.
研究的目的:
- 调查流量强度如何影响息地异质性和在不同程度的人类修改的河流中对巨和巨无脊椎动物的庇护所的可用性.
- 评估河流恢复在增强息地异质性和避难所中的作用.
主要方法:
- 在10条瑞士河流中,结合了水力场数据与水力动力学建模,跨越了三个流域形态 (严重修改,轻微修改,恢复) 的水力场数据.
- 在30个河流流域中,模拟了息地异质性 (流速,床压力) 和在平均流量 (QM) 和6个洪水强度 (HQ1-HQ100) 上的庇护所可用性.
主要成果:
- 与所有流量强度的严重修改流域相比,恢复的流域在流速 (+17%) 和床剪应力 (+34%) 中表现出明显更高的息地异质性.
- 增加流量强度减少了息地在流速 (-45%) 和床剪压力 (-43%) 的异质性,从QM到HQ100.
- 随着洪水强度的提高 (HQ1到HQ100),避难所的可用性下降,但在恢复和稍微修改的流域中仍然存在,与息地异质性有积极的相关性.
结论:
- 河流恢复可以显著增加息地异质性,从而促进庇护所的可用性,并提高修改后的河流生态系统对洪水的抵御力.
- 建议在修复规划中明确考虑不同的洪水强度,特别是考虑到由于气候变化而导致洪水事件的预计增加.
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