The interaction between abiotic photodegradation and microbial decomposition under ultraviolet radiation

© 2014 John Wiley & Sons Ltd.

Bibliographische Detailangaben
Veröffentlicht in:Global change biology. - 1999. - 21(2015), 5 vom: 24. Mai, Seite 2095-104
1. Verfasser: Wang, Jing (VerfasserIn)
Weitere Verfasser: Liu, Lingli, Wang, Xin, Chen, Yiwei
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2015
Zugriff auf das übergeordnete Werk:Global change biology
Schlagworte:Journal Article Meta-Analysis Research Support, Non-U.S. Gov't DOC abiotic degradation lignin litter decomposition meta-analysis microbial activity microbial decomposition mehr... microcosm photodegradation Nitrogen N762921K75
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520 |a 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 
650 4 |a Journal Article 
650 4 |a Meta-Analysis 
650 4 |a Research Support, Non-U.S. Gov't 
650 4 |a DOC 
650 4 |a abiotic degradation 
650 4 |a lignin 
650 4 |a litter decomposition 
650 4 |a meta-analysis 
650 4 |a microbial activity 
650 4 |a microbial decomposition 
650 4 |a microcosm 
650 4 |a photodegradation 
650 7 |a Nitrogen  |2 NLM 
650 7 |a N762921K75  |2 NLM 
700 1 |a Liu, Lingli  |e verfasserin  |4 aut 
700 1 |a Wang, Xin  |e verfasserin  |4 aut 
700 1 |a Chen, Yiwei  |e verfasserin  |4 aut 
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773 1 8 |g volume:21  |g year:2015  |g number:5  |g day:24  |g month:05  |g pages:2095-104 
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