从洪水平原的历史断开改变了沿海森林的组成,树木的生长和枯木量
J Julio Camarero1, Michele Colangelo2, Patricia M Rodríguez-Gonzalez3
1Pyrenean Institute of Ecology (IPE-CSIC), Avda. Montañana 1005, 50192 Zaragoza, Spain.
The Science of the total environment
|July 5, 2023
概括
河流曲的变化会影响沿海森林. 减少曲度和大变化的流量会影响森林组成,树木生长和枯木,强调需要在保护中考虑地形学因素.
科学领域:
- 生态生态学 生态生态学
- 地质形态学 地质形态学
- 森林科学 森林科学 森林科学
背景情况:
- 河岸森林是动态的生态系统,受到河流地形学变化的威胁.
- 河流的曲度是地形变化的关键指标,影响了河森林的动态.
- 缺乏长期评估,将曲与森林组成,树木生长和枯木联系起来.
研究的目的:
- 为了重建中部埃布罗盆地的历史河流曲.
- 评估曲度变化对沿海森林组成,树木生长和枯木的影响.
- 为了评估因大建设而改变河流流动对树木辐射生长的影响.
主要方法:
- 用1927年至2015年的历史航空照片重建河流曲.
- 分析曲度,树组成,枯木数量和腐烂之间的关系.
- 对主要树种 (Populus alba,Populus nigra,Fraxinus angustifolia,Salix alba,Ulmus minor) 的辐射生长的重建,与河流的关系.
主要成果:
- 河流曲率从1927年的1.39下降到2014-2015年的1.20,在20世纪50年代至60年代的水建设后发生了重大变化.
- 在1956年,高曲度的地点支持成熟的树立,有大型Populus nigra. 阴性与Fraxinus angustifolia和Populus alba的丰富度有负相关性.
- 曲度的丧失和河岸梯度的收缩导致了泛滥平原的断开,改变了物种组成. 河流的流量转移减少了树木的生长,增加了生长的一致性.
结论:
- 历史上的河流地形,特别是状,显著塑造了沿海森林的结构和组成.
- 人为引起的变化,如水建设和流量调节,对沿海生态系统产生了深远的影响.
- 为了有效管理,保护和恢复工作必须整合历史河流动态和地形学变化.
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