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A test of manganese effects on decomposition in forest and cropland sites
Key Laboratory of Forest Ecology and Management, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, China.
Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, China; University of Chinese Academy of Sciences, Beijing, China.
University of Gävle, Faculty of Health and Occupational Studies, Department of Occupational and Public Health Sciences, Biology. Department of Forest Sciences, University of Helsinki, Helsinki, Finland.
School of International Education, Beijing University of Chemical Technology, Beijing, China.
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2019 (English)In: Soil Biology and Biochemistry, ISSN 0038-0717, E-ISSN 1879-3428, Vol. 129, p. 178-183Article in journal (Refereed) Published
Abstract [en]

Litter of plant origin is the main source of soil organic matter, and its physical and chemical quality and decomposition rates are key variables in the prediction and modelling of how litter-derived carbon (C) is cycling through the ecosystem. However, the biological control factors for decomposition are not well understood and often poorly represented in global C models. These are typically run using simple parameters, such as nitrogen (N) and lignin concentrations, characterizing the quality of the organic matter input to soils and its accessibility to decomposer organisms. Manganese (Mn) is a key component for the formation of manganese peroxidase (MnP), an important enzyme for lignin degradation. However, the functional role of Mn on plant litter decomposition has been rarely experimentally examined. Here, using a forest and a cropland site we studied, over 41 months, the effects of Mn fertilization on MnP activity and decomposition of eight substrates ranging in initial lignin concentrations from 9.8 to 44.6%. Asymptotic decomposition models fitted the mass loss data best and allowed us to separately compare the influence of Mn fertilization on different litter stages and pools. Across substrates, Mn fertilization stimulated decomposition rates of the late stage where lignin dominates decomposition, resulting in smaller fraction of slowly decomposing litter. The increased MnP activity caused by Mn fertilization provided the mechanism explaining the stimulated decomposition in the Mn-addition treatments.

Place, publisher, year, edition, pages
2019. Vol. 129, p. 178-183
Keywords [en]
Keywords Cropland Decomposition Forest Lignin Manganese Manganese peroxidase
National Category
Biological Sciences
Identifiers
URN: urn:nbn:se:hig:diva-28340DOI: 10.1016/j.soilbio.2018.11.018ISI: 000457661000018Scopus ID: 2-s2.0-85059321711OAI: oai:DiVA.org:hig-28340DiVA, id: diva2:1266173
Note

State Key Program of China  Grant no: 2016YFD0300904 and  2016YFA0600800Natural Science Foundation of China Grant no: 31500361,  31700397, and  31830015Key Research Program of Frontier Sciences of Chinese Academy of Sciences Grant no: QYZDB-SSW-DQC00

Available from: 2018-11-27 Created: 2018-11-27 Last updated: 2019-08-09Bibliographically approved

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