Effects of Fire Frequency Regimes on Flammability and Leaf Economics of Non-Graminoid Vegetation

IF 3 3区 农林科学 Q2 ECOLOGY
Arthur Lamounier Moura, D. Negreiros, G. Fernandes
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引用次数: 1

Abstract

Fire is an ecological factor that strongly influences plant communities and functional traits. Communities respond differently to fire, either decreasing or increasing in flammability and resource acquisition strategies. This study aimed to investigate the influence of fire over traits associated with flammability and the plant economic spectrum in a stressful and infertile mountainous grassland located in the Espinhaço mountain range in Brazil. Non-graminoid plant species were sampled in 60 5 m × 5 m plots distributed in three fire frequency categories. We measured several traits related to flammability—leaf dry matter content (LDMC), twig dry matter content, leaf area, bark thickness, branching architecture, plant height, leaf toughness (LT), and specific leaf area (SLA). Traits responded differently to the increase in fire frequency. For instance, the LDMC and LT were lower while the SLA was higher at high fire frequencies, indicating a trend towards reduced heat release and fire residence time. This shift resulted in the dominance of plants with a relatively more acquisitive strategy. This study brings evidence that traits respond coordinately towards a reduction of flammability with the increase in fire frequency and are strong indicators of the filtering role that fire plays as a disturbance on rupestrian grassland vegetation.
不同火灾频率对非禾本科植被易燃性和叶片经济性的影响
火是一种强烈影响植物群落和功能性状的生态因子。社区对火灾的反应不同,可燃性和资源获取策略要么降低,要么增加。本研究旨在研究火灾对巴西埃斯帕纳帕拉多山区干旱和贫瘠山地草原上与可燃性相关的性状和植物经济谱的影响。非禾本科植物在60个5 × 5 m的样地取样,分布在3种火灾频率类型中。我们测量了与可燃性相关的几个性状——叶片干物质含量(LDMC)、树枝干物质含量、叶面积、树皮厚度、分枝结构、植株高度、叶片韧性(LT)和比叶面积(SLA)。性状对火灾频率的增加有不同的反应。例如,在高火灾频率下,LDMC和LT较低,而SLA较高,表明热量释放和火灾停留时间有减少的趋势。这一转变导致了植物以相对更具收购性的策略占据主导地位。本研究提供的证据表明,随着火灾频率的增加,性状对可燃性的降低有协调的反应,这是火灾对草原植被干扰的过滤作用的有力指标。
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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