Effect of soil microorganisms and labile C availability on soil respiration in response to litter inputs in forest ecosystems: A meta‐analysis

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Title: Effect of soil microorganisms and labile C availability on soil respiration in response to litter inputs in forest ecosystems: A meta‐analysis
Authors: Zhang, YanjunZou, JunliangMeng, DelongOsborne, Bruce A.et al.
Permanent link: http://hdl.handle.net/10197/12612
Date: Dec-2020
Online since: 2021-11-09T16:56:40Z
Abstract: Litter inputs can influence soil respiration directly through labile C availability and, indirectly, through the activity of soil microorganisms and modifications in soil microclimate; however, their relative contributions and the magnitude of any effect remain poorly understood. We synthesized 66 recently published papers on forest ecosystems using a meta‐analysis approach to investigate the effect of litter inputs on soil respiration and the underlying mechanisms involved. Our results showed that litter inputs had a strong positive impact on soil respiration, labile C availability, and the abundance of soil microorganisms, with less of an impact related to soil moisture and temperature. Overall, soil respiration was increased by 36% and 55%, respectively, in response to natural and doubled litter inputs. The increase in soil respiration induced by litter inputs showed a tendency for coniferous forests (50.7%)> broad‐leaved forests (41.3%)> mixed forests (31.9%). This stimulation effect also depended on stand age with 30‐ to 100‐year‐old forests (53.3%) and ≥100‐year‐old forests (50.2%) both 1.5 times larger than ≤30‐year‐old forests (34.5%). Soil microbial biomass carbon and soil dissolved organic carbon increased by 21.0%‐33.6% and 60.3%‐87.7%, respectively, in response to natural and doubled litter inputs, while soil respiration increased linearly with corresponding increases in soil microbial biomass carbon and soil dissolved organic carbon. Natural and doubled litter inputs increased the total phospholipid fatty acid (PLFA) content by 6.6% and 19.7%, respectively, but decreased the fungal/bacterial PLFA ratio by 26.9% and 18.7%, respectively. Soil respiration also increased linearly with increases in total PLFA and decreased linearly with decreases in the fungal/bacterial PLFA ratio. The contribution of litter inputs to an increase in soil respiration showed a trend of total PLFA > fungal/bacterial PLFA ratio > soil dissolved organic carbon > soil microbial biomass carbon. Therefore, in addition to forest type and stand age, labile C availability and soil microorganisms are also important factors that influence soil respiration in response to litter inputs, with soil microorganisms being more important than labile C availability.
Funding Details: National Natural Science Foundation of China
Special Project on Hi‐Tech Innovation Capacity
Excellent Youth Scholars Program from Beijing Academy of Agriculture and Forestry Sciences
Scientific and Technological Plan Projects in Shaanxi Province
The Hunan International Scientific and Technological Cooperation Base of Environmental Microbiome and Application
Doctoral Research Project of Baoji University of Arts and Sciences
Type of material: Journal Article
Publisher: Wiley
Journal: Ecology and Evolution
Volume: 10
Issue: 24
Start page: 13602
End page: 13612
Copyright (published version): 2020 the Authors
Keywords: Labile C availabilityLitter inputsMeta-analysisSoil microorganismsSoil respiration
DOI: 10.1002/ece3.6965
Language: en
Status of Item: Peer reviewed
ISSN: 2045-7758
This item is made available under a Creative Commons License: https://creativecommons.org/licenses/by/3.0/ie/
Appears in Collections:Biology & Environmental Science Research Collection
Earth Institute Research Collection

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