DOI: 10.1111/gcb.12812
论文题名: The interaction between abiotic photodegradation and microbial decomposition under ultraviolet radiation
作者: Wang J. ; Liu L. ; Wang X. ; Chen Y.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2015
卷: 21, 期: 5 起始页码: 2095
结束页码: 2104
语种: 英语
英文关键词: DOC
; Abiotic degradation
; Lignin
; Litter decomposition
; Meta-analysis
; Microbial activity
; Microbial decomposition
; Microcosm
; Photodegradation
Scopus关键词: biodegradation
; biotic factor
; dissolved organic carbon
; lignin
; litter
; meta-analysis
; microbial activity
; microbial community
; microcosm
; photodegradation
; ultraviolet radiation
; nitrogen
; meta analysis
; metabolism
; microbiology
; photolysis
; plant leaf
; radiation response
; statistical model
; theoretical model
; ultraviolet radiation
; Linear Models
; Models, Theoretical
; Nitrogen
; Photolysis
; Plant Leaves
; Ultraviolet Rays
英文摘要: Elevated ultraviolet (UV) radiation has been demonstrated to stimulate litter decomposition. Despite years of research, it is still not fully understood whether the acceleration in litter degradation is primarily attributed to abiotic photodegradation or the combined effects of abiotic photodegradation and microbial decomposition. In this study, we used meta-analysis to synthesize photodegradation studies and compared the effects of UV radiation on litter decomposition between abiotic and biotic conditions. We also conducted a microcosm experiment to assess the effects of UV radiation on litter biodegradability and microbial activity. Overall, our meta-analysis found that under abiotic photodegradation, UV radiation reduced the remaining litter mass by 1.44% (95% CI: 0.85% to 2.08%), did not affect the remaining lignin and increased the dissolved organic carbon (DOC) concentration by 14.01% (1.49-23.67%). Under combined abiotic photodegradation and microbial decomposition, UV radiation reduced the remaining litter mass and lignin by 1.60% (0.04-3.58%) and 16.07% (9.27-24.23%), respectively, but did not alter DOC concentration. UV radiation had no significant impact on soil microbial biomass carbon (MBC), but it reduced microbial respiration by 44.91% (2.26-78.62%) and altered the composition of the microbial community. In addition, UV radiation reduced nitrogen (N) immobilization by 19.44% (4.77-37.92%). Our microcosm experiment further indicated that DOC concentration and the amount of respired C in UV-treated litter increased with UV exposure time, suggesting that longer UV exposure resulted in greater biodegradability. Overall, our study suggested that UV exposure could increase litter biodegradability by increasing the microbial accessibility of lignin, as well as the labile carbon supply to microbes. However, the remaining litter mass was not different between the abiotic and biotic conditions, most likely because the positive effect of UV radiation on litter biodegradability was offset by its negative effect on microbial activity. Our results also suggested that UV radiation could alter the N cycle during decomposition, primarily by inhibiting N immobilization. © 2014 John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61736
Appears in Collections: 影响、适应和脆弱性
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作者单位: State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Xiangshan, Beijing, China; University of Chinese Academy of Sciences, Yuquanlu, Beijing, China
Recommended Citation:
Wang J.,Liu L.,Wang X.,et al. The interaction between abiotic photodegradation and microbial decomposition under ultraviolet radiation[J]. Global Change Biology,2015-01-01,21(5)