Fungal community is the dominant decomposer of wood at early stages.
During wood decomposition, microbial community composition shifted from fungi-dominated at early stages to relatively more bacteria-dominated ones at later stages. Fungal community dominance during early decomposition stages is associated with relatively high-quality carbon compounds and low wood moisture contents.
Our results highlight that fungal groups were strongly influenced by relatively high-quality organic carbon, but bacterial groups are positively correlated with low-quality carbon compounds. This contrasts with the observations of leaf litter decomposition and will provide a key insight toward a better wood decomposition model in DOE’s Earth System Model.
Although decaying wood plays an important role in global carbon (C) cycling, how changes in microbial community are related to wood C quality and then affect wood organic C loss during wood decomposition remains unclear. In this study, a chronosequence method was used to examine the relationships between wood C loss rates and microbial community compositions during Chinese fir (Cunninghamia lanceolata) stump decomposition. Our results showed that the microbial community shifted from fungi-dominated community at early stages to relatively more bacteria-dominated ones at later stages during wood decomposition. Fungal phospholipid fatty acid content primarily explained wood C loss rates during decomposition. Interestingly, fungi biomass was positively correlated with proportions of relatively high-quality C (e.g., O-alkyl-C), but bacterial biomass was positively correlated with low-quality C. In addition, fungi biomass dominance at the early stages (0-15 years) was associated with low wood moisture (< 20%), while the increase in bacteria biomass at later stages (15-35 years) was associated with increasing wood moisture. Our findings suggest that the fungal community is the dominant decomposer of wood at early stages and may be positively influenced by relatively high-quality wood C and low wood moisture contents. Bacteria were positively influenced by low-quality wood C and high wood moisture contents at later stages. Enhanced understanding of microbial responses to wood quality and environment is important to improve predictions in wood decomposition models.
Los Alamos National Laboratory
Contacts (BER PM)
This study was funded by the National Natural Science Foundation of China (41371269 and 31570604), the National “973” Program of China (2014CB954002), the China Scholarship Council (201506100166) and the US Department of Energy’s Next Generation Ecosystem Experiment-Tropics.
Hu Z., Xu C., McDowell N.G., Johnson D.J., Wang M, Huang Z, Zhou X (2017), Linking microbial community composition to C loss during wood decomposition. Soil Biology and Biochemistry, 104: 108-116. doi:10.1016/j.soilbio.2016.10.017. (Reference link)
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