地中海混合森林的干旱遗产:分析结构超越,功能特征和地点因素的影响
Santain S P Italiano1, J Julio Camarero2, Marco Borghetti1
1Scuola di Scienze Agrarie, Forestali, Alimentari e Ambientali, Università della Basilicata, Viale dell'Ateneo Lucano 10, 85100 Potenza, Italy.
The Science of the total environment
|April 4, 2024
概括
以前的湿条件可以使森林易受干旱的影响,这种现象被称为结构性超越. 这项研究发现,地中海森林的干旱影响和遗产取决于物种和地点条件,有些树木显示恢复,而另一些树木则表现出负面影响.
科学领域:
- 生态生态学 生态生态学
- 森林科学 森林科学 森林科学
- 气候变化影响 气候变化影响
背景情况:
- 有利的气候条件可以刺激树木的生长,可能通过结构超标增加对未来干旱的脆弱性.
- 现场数据有限,这阻碍了对如何影响森林枯竭的现场条件和树种的理解,原因是干旱引起的结构超越.
研究的目的:
- 评估2017年干旱对地中海混合森林的树冠覆盖和生长的影响.
- 评估干旱对树木生长的遗留影响,考虑地点条件和物种特征.
- 调查结构超越在森林对干旱反应中的作用.
主要方法:
- 分析遥感数据 (NDVI) 和树环宽度数据.
- 基底面积增量 (BAI) 的评估,以评估遗留效应.
- 观察到的增长与预测的增长进行比较,以确定干旱影响.
主要成果:
- 大多数森林种植区在2017年干旱期间经历了BAI和树冠覆盖面的减少.
- 增长下降后经常会出现复苏,并观察到积极的遗留效应,特别是在Fraxinus ornus.
- 在一些物种 (Quercus pubescens,Acer monspessulanum) 和地点发现了负面干旱遗产,与干旱前的高生长率有关.
- 一些F. ornus遗址的阳性遗留与Quercus pubescens衰退后的生长释放有关.
结论:
- 有证据表明结构性干旱过度,但特定于某些地点和物种.
- 森林对干旱的应对取决于特定地点的因素,包括树组成和干旱前的条件.
- 干旱显著改变混合森林的组成和动态,强调需要对特定物种和特定地点进行评估.
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