Past fire shaping future fuel: influence of recent fire history on forest foliage chemistry

IF 2.9 3区 农林科学 Q1 FORESTRY
Margot A. Schneider, Geoffrey J. Cary, Elle J. Bowd, Claire N. Foster
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引用次数: 0

Abstract

Background

Knowledge of how fire regimes influence flammability, and its role in shaping future fire regimes, exists mostly at species composition and ecosystem levels. The effect of fire regimes on fuel at the chemical level is poorly known.

Aim

We aimed to empirically investigate the association between recent fire history and forest foliage chemistry; and to explore potential implications for forest fuel flammability.

Methods

Using an orthogonal study design, we investigated the effects of fire frequency and time since fire on the chemical composition of Eucalyptus pilularis leaves from forest canopies and surface litter in south-eastern Australia.

Key results

We found high fire frequency (fire-return interval 10–13 years) was associated with higher C:N, C:P, and C:K ratios in E. pilularis surface litter, and higher C:P in canopy leaves.

Conclusions

Nutrients including nitrogen and phosphorous reduce flammability of plant tissues, and hence, the observed differences in leaf nutrients between high and low fire frequency sites could have important implications for future flammability of these forests.

Implications

Our study has demonstrated a relationship between fire frequency and leaf nutrient stoichiometry, which may act as a mechanism through which repeated fires could increase fuel flammability. This warrants further investigation in other environments.

过去的火灾塑造了未来的燃料:近期火灾史对森林叶片化学的影响
背景关于火灾机制如何影响易燃性及其在形成未来火灾机制中的作用的知识,主要存在于物种组成和生态系统层面。人们对火灾制度在化学层面上对燃料的影响知之甚少。目的我们旨在通过实证研究近期火灾历史与森林叶片化学之间的关系,并探讨其对森林燃料可燃性的潜在影响。方法我们采用正交研究设计,调查了火灾频率和火灾发生后的时间对澳大利亚东南部森林树冠和地表枯落物中桉树叶片化学成分的影响。主要结果我们发现,高火灾频率(火灾后间隔 10-13 年)与 E. pilularis 表层落叶中较高的 C:N、C:P 和 C:K 比率以及树冠叶片中较高的 C:P 比率有关。结论包括氮和磷在内的营养元素会降低植物组织的易燃性,因此在火灾频率高和火灾频率低的地点观察到的叶片营养元素差异可能会对这些森林未来的易燃性产生重要影响。意义我们的研究证明了火灾频率与叶片养分组成之间的关系,这可能是重复火灾增加燃料易燃性的一种机制。这值得在其他环境中进一步研究。
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来源期刊
CiteScore
5.50
自引率
9.70%
发文量
67
审稿时长
12-24 weeks
期刊介绍: International Journal of Wildland Fire publishes new and significant articles that advance basic and applied research concerning wildland fire. Published papers aim to assist in the understanding of the basic principles of fire as a process, its ecological impact at the stand level and the landscape level, modelling fire and its effects, as well as presenting information on how to effectively and efficiently manage fire. The journal has an international perspective, since wildland fire plays a major social, economic and ecological role around the globe. The International Journal of Wildland Fire is published on behalf of the International Association of Wildland Fire.
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