Mycorrhizal mycelial respiration: A substantial component of soil respired CO2. (December 2021)

• Record Type: Journal Article
• Authors: Han, Mengguang; Feng, Jiguang; Chen, Ying; Sun, Lijuan; Fu, Liangchen; Zhu, Biao
• Is Part Of: Soil biology and biochemistry. Volume 163(2021)
• Publication Date: 2021-12
• Subjects: Mycorrhizal fungi -- CO2 efflux -- Mycelium -- Soil respiration -- Root respiration; Soil biochemistry -- Periodicals; Soil biology -- Periodicals; Sols -- Biochimie -- Périodiques; Sols -- Biologie -- Périodiques; Sols -- Microbiologie -- Périodiques; Bodembiologie; Biochemie; 631.46
• DOI: 10.1016/j.soilbio.2021.108454
• Languages: English
• ISSNs: 0038-0717

Abstract

Abstract: Mycorrhizal fungi constitute a considerable sink for plant photo-assimilates, yet poor knowledge about mycorrhizal mycelial respiration (RMyc ) hinders the quantification of its role in belowground carbon cycling. We synthesized available field data of RMyc, and found that RMyc contributed 15% of soil respiration and 38% of autotrophic respiration (including RMyc and root respiration, RRoot ). We observed no significant differences of RMyc between ectomycorrhiza and arbuscular mycorrhiza dominated ecosystems. Both RMyc /RRoot and RMyc /(RRoot + RMyc ) significantly decreased with increasing RRoot, and correlated with absolute latitude, mean annual temperature and precipitation. Collectively, RMyc is a substantial component of soil respiration and exhibits divergent geographical pattern with that of RRoot, and should be considered separately in terrestrial carbon cycling models. Highlights: RMyc contributed 15% of soil respiration and 38% of autotrophic respiration. RMyc was similar between ECM and AM dominated ecosystems. Both RMyc /RRoot and RMyc /(RRoot + RMyc ) decreased with increasing root respiration. Both RMyc /RRoot and RMyc /(RRoot + RMyc ) increased with absolute latitude. MAT and MAP showed negative correlations with RMyc /RRoot and RMyc /(RRoot + RMyc ).