期刊
FUNGAL ECOLOGY
卷 4, 期 6, 页码 396-407出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.funeco.2011.01.004
关键词
Acer saccharum; Carbon sequestration; Decomposition; Extracellular enzyme; Incubation; Lignin; Litter; Microbial community; Nutrients; PLFA
资金
- NSF [0918718]
- Division Of Environmental Biology
- Direct For Biological Sciences [0918718] Funding Source: National Science Foundation
The Guild Decomposition Model (GDM) hypothesized that temporal shifts in microbial guilds, each with distinct substrate preferences, drive decomposition dynamics and regulate soil carbon (C) losses and sequestration. To test this hypothesis, we established a laboratory incubation of Acer saccharum litter and monitored respiration, microbial biomass and enzyme activities, inorganic nutrients and shifts in functional groups of decomposers using phospholipid fatty acid (PLFA) analysis. Biomass and respiration peaked within the first 2 d of incubation, and the Gram negative PLFA biomarker 18:1 omega 7c predominated during the first 5 d. Hydrolytic enzyme activities and two fungal biomarkers (18:2 omega 6,9c and 18:3 omega 6c) increased by 25 d and lignolytic enzyme activity was detected at 68 d. Our results suggest that decomposers preferentially use labile substrates and that shifts in decomposer groups occur in response to changes in available substrates, which supports the GDM. (C) 2011 Elsevier Ltd and The British Mycological Society. All rights reserved.
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