干旱遗产与野火相互作用,改变地中海气候类型森林中的土壤微生物群落
A J M Hopkins1, A J Brace1, J L Bruce1
1Molecular Ecology and Evolution Group, School of Science, Edith Cowan University, Joondalup, WA 6027, Australia.
The Science of the total environment
|January 17, 2024
概括
地中海森林面临着日益严重的干旱和野火. 土壤微生物群落,特别是真菌,在联合干扰后表现出减少的多样性和功能,突出显示了过去气候条件对生态系统弹性的遗产.
科学领域:
- 生态生态学 生态生态学
- 土壤科学 土壤科学
- 微生物学 微生物学
背景情况:
- 地中海森林容易受到不断升级的干旱和野火事件的影响.
- 了解生态系统对多种干扰的长期反应,特别是地下微生物群落,对于森林的弹性至关重要.
- 树叶球微生物对森林功能至关重要,但它们对连续干扰的反应仍未得到充分研究.
研究的目的:
- 调查干旱和野火的长期影响,单独或组合,在Eucalyptus marginata森林中的树根球微生物群落.
- 评估这些干扰如何影响微生物丰富性,多样性,组成和功能组随着时间的推移.
- 确定过去气候条件对微生物社区对后续干扰反应的遗留影响.
主要方法:
- 土壤样本从有野火和/或更热的干旱历史的Eucalyptus marginata森林中收集.
- 用高通量测序提取,放大和分析真菌和细菌DNA.
- 检查了微生物的丰富性,多样性,社区组成和功能群体,与干扰史相关.
主要成果:
- 随着干扰的增加,菌丰富性和多样性的单调下降被观察到,干旱和野火相结合的变化是最显著的.
- 社区组成受到火灾的影响比干旱影响更大,但两者的结合为真菌产生了最多的指标类型.
- 在干旱加野火灾地区,关键的真菌群体 (菌根真菌,菌,病原体) 减少,而野火对细菌和回收器产生了积极影响.
结论:
- 土壤微生物群体,特别是真菌功能群体,对干旱后的野火非常敏感.
- 过去的气候条件,比如更热的干旱,显著介导土壤微生物对后续干扰的反应,如野火.
- 森林生态系统对气候变化的弹性受先前环境条件对地下微生物群落遗留的影响.
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