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在树冠下偷看:异常短的火灾回报间隔改变了亚山林底层植物群落
Nathan G Kiel1, Kristin H Braziunas1,2, Monica G Turner1
1Department of Integrative Biology, University of Wisconsin-Madison, Madison, WI, 53706, USA.
The New phytologist
|June 1, 2023
概括
气候变化正在改变森林火灾的模式. 短火回归间隔 (FRI) 对树木再生产生负面影响,并将地下植物群向适应干旱的物种转移.
科学领域:
- 森林生态森林生态学
- 气候变化影响气候变化的影响.
- 火灾生态学 火灾生态学
背景情况:
- 气候变化正在改变全球干扰制度.
- 一些森林生态系统的特点是罕见的,严重的火灾.
- 缩短的回火间隔 (FRI) 减少了树木再生,但不知道底层效应.
研究的目的:
- 调查短时间火灾对地下植物群落的影响.
- 为了比较一再燃烧的森林与历史上未燃烧的森林地块中的地下植物群落.
主要方法:
- 在Greater Yellowstone的31个地块对中采样地下植物群落.
- 将两个燃烧在<30年中的地块与一个燃烧在>125年的地块进行比较.
- 分析与火灾历史和环境因素有关的物种组成,数量和社区差异.
主要成果:
- 短时间的火灾导致了适应更干燥条件和较低植被区的物种的丰富性增加.
- 植物群落的区域差异在短时间的火灾后减少.
- 减少火灾后树木密度,而不是FRI本身,影响了大多数植物物种的出现.
- 观察到社区的热化和区域的同质化.
结论:
- 异常短的回火间隔显著改变了温带森林中低木植物群落.
- 这些转变包括物种组成的变化,有利于耐旱物种,并导致社区同质化.
- 持续的气候和火灾变化可能会加剧这些地下社区的变化.
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