与根相关的真菌和收购性根特征促进永久土从长期经过实验加热的原吸收
Rebecca E Hewitt1,2, M Rae DeVan3, D Lee Taylor3
1Center for Ecosystem Science and Society, Northern Arizona University, PO Box 5620, Flagstaff, AZ, 86011, USA.
The New phytologist
|January 26, 2024
概括
温暖的北极原改变了植物的根特征和与根相关的真菌 (RAF),影响了永久土融化的 (N) 吸收. 根特征,而不是RAF,推动了这种N的获取,影响了气候反.
科学领域:
- 北极的生态学 北极的生态学
- 植物与土壤的相互作用
- 气候变化科学 气候变化科学
背景情况:
- (N) 的可用性限制了北极植物的生长.
- 永久土的解引入了由于人为变暖而导致的新源.
- 变暖对原根特征,根相关真菌 (RAF) 和永久土N吸收的影响尚不清楚.
研究的目的:
- 调查RAF,根特征和北极土中永久土N吸收之间的关系.
- 评估长期实验变暖对这些相互作用的影响.
- 了解改变N循环的潜在气候反.
主要方法:
- 近三十年来,在阿拉斯加的Toolik湖,德拉地区进行了实验性变暖.
- 对原植物物种特异性根特征的分析.
- 根系相关的真菌群落的特征.
- 测量从永久土中吸收的 (N).
主要成果:
- 在非菌根和菌根植物中,变暖促进了更具收购力的根特征.
- 根相关真菌 (RAF) 社区的组成随着埃里科伊德 (ERM) 灌木的变暖而变化,与根特征相关.
- RAF种群,特别是深色隔膜内植物,ERM和外菌 (ECM),与永久土中ECM和ERM灌木中的N吸收相关.
- 根特征解释了永久土N吸收变化的比例比RAF.更大.
结论:
- 北极生态系统的变暖将改变植物根,RAF和永久土解之间的相互作用.
- 这些相互作用,特别是由根特征驱动的相互作用,将显著影响碳和循环.
- 改变的N循环可能会导致对全球气候系统的重大反.
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