Burn Severity Effect on the Short-Term Functional Response of Quercus ilex after Fire

IF 3 3区 农林科学 Q2 ECOLOGY
A. Parra, M. B. Hinojosa
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Abstract

Understanding how fire severity affects resprouting plants during post-fire regeneration is key to anticipating Mediterranean vegetation vulnerability in a context of increasingly large fires with high intensity and severity due to climate change. Here, we monitored the water status, leaf gas exchange, and plant growth in holm oaks (Quercus ilex) of central Spain burned with different fire severity throughout the first post-fire year. The Q. ilex burned with high severity (HB+) showed higher water potential and shoot growth than those burned with low severity (LB+) or unburned (B−), especially during spring and summer. In summer, resprouting HB+ and LB+ plants exhibited higher carbon assimilation than unburned ones. Moreover, we also found that plants with higher water availability and growth, i.e., HB+ individuals, had higher specific leaf area and lower water use efficiency. Overall, our study shows that holm oak forests exhibit high plasticity to fire and that Q. ilex burned with high severity have a faster short-term regeneration than those burned with low severity. However, this rapid regeneration is based on a less conservative water-use strategy, which could jeopardize their populations in case of extreme drought events increasingly common in the current context of climate change.
烧伤严重程度对火后Quercus ilex短期功能反应的影响
了解火灾严重程度如何影响火灾后再生过程中的再生植物,是预测地中海植被脆弱性的关键,因为气候变化导致的火灾强度和严重程度越来越大。在这里,我们监测了西班牙中部不同火灾严重程度的霍姆橡树(Quercus ilex)在火灾后的第一年的水分状况、叶片气体交换和植物生长。与低严重程度(LB+)或未燃烧(B-)相比,高严重程度(HB+)燃烧的冬青表现出更高的水势和枝条生长,尤其是在春季和夏季。在夏季,重燃的HB+和LB+植物比未燃的植物表现出更高的碳同化作用。此外,我们还发现,水分有效性和生长性较高的植物,即HB+个体,具有较高的比叶面积和较低的水分利用效率。总的来说,我们的研究表明,霍姆橡树林对火灾表现出很高的可塑性,并且高严重程度燃烧的冬青树比低严重程度的冬青树有更快的短期再生。然而,这种快速再生是基于一种不那么保守的用水策略,如果在当前气候变化的背景下发生越来越常见的极端干旱事件,这可能会危及他们的人口。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Fire-Switzerland
Fire-Switzerland Multiple-
CiteScore
3.10
自引率
15.60%
发文量
182
审稿时长
11 weeks
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