期刊
BIOGEOCHEMISTRY
卷 118, 期 1-3, 页码 471-486出版社
SPRINGER
DOI: 10.1007/s10533-013-9912-7
关键词
Litter decomposition; Carbon and nitrogen dynamics; Amino sugars; Amino acids; Fungi; Bacteria
资金
- Japanese Society for the Promotion of Science [21710014]
- Rakuno Gakuen University
- NSF [0843417]
- Directorate For Geosciences
- Division Of Earth Sciences [0843417] Funding Source: National Science Foundation
- Grants-in-Aid for Scientific Research [21710014] Funding Source: KAKEN
Much has been learned about the microbial decomposition of plant litter, but relatively little is known about microbial contributions to litter and soil chemistry. We conducted a 3-year litterbag experiment and measured hydrolyzable amino acids (AA) and amino sugars (AS) to gain insights about microbial contributions to the chemical characteristics of decomposing litter and soil. Microscopic observations of hyphae were used to estimate fungal contributions to litter. The carbon (C)-normalized yields of AA and AS increased during decomposition along with nitrogen (N), indicating a shift in chemical characteristics from C-rich plant-derived biopolymers to N-rich, microbially-derived biochemicals. The contributions of fungal biomass to C and N were minor, but necromass of fungi as melanized and clamp-bearing hyphae increased during litter decomposition. Yields of glucosamine and galactosamine in litter approached those in microorganisms, particularly bacteria, suggesting major contributions of bacterial residues to litter during decomposition. The microbial contributions to decomposing litter were consistent with those observed in organic and mineral soils. Microorganisms play important roles in the organization and stabilization of soil organic matter as well as N immobilization and organic C preservation.
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