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Carbon sequestration in soil in a semi-natural Miscanthus sinensis grassland and Cryptomeria japonica forest plantation in Aso, Kumamoto, Japan

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Title: Carbon sequestration in soil in a semi-natural Miscanthus sinensis grassland and Cryptomeria japonica forest plantation in Aso, Kumamoto, Japan
Authors: Toma, Yo Browse this author
Armstrong, Kevin Browse this author
Ryan Stewart, J. Browse this author
Yamada, Toshihiko Browse this author →KAKEN DB
Nishiwaki, Aya Browse this author →KAKEN DB
Fernández, Fabián G. Browse this author
Keywords: carbon sequestration
Cryptomeria japonica
Miscanthus sinensis
soil
δ13C
δ15N
Issue Date: Sep-2012
Publisher: Wiley-Blackwell
Journal Title: Global Change Biology Bioenergy
Volume: 4
Issue: 5
Start Page: 566
End Page: 575
Publisher DOI: 10.1111/j.1757-1707.2012.01160.x
Abstract: Although Miscanthus sinensis grasslands (Misc-GL) and Cryptomeria japonica forest plantations (Cryp-FP) are proposed bioenergy feedstock systems, their relative capacity to sequester C may be an important factor in determining their potential for sustainable bioenergy production. Therefore, our objective was to quantify changes in soil C sequestration 47 years after a Misc-GL was converted to a Cryp-FP. The study was conducted on adjacent Misc-GL and Cryp-FP located on Mt. Aso, Kumamoto, Japan. After Cryp-FP establishment, only the Misc-GL continued to be managed by annual burning every March. Mass C and N, δ13C, and δ15N at 0–30 cm depth were measured in 5 cm increments. Carbon and N concentrations, C:N ratio, δ13C, and δ15N were measured in litter and/or ash, and rhizomes or roots. Although C input in Misc-GL by M. sinensis was approximately 36% of that in Cryp-FP by C. japonica, mean annual soil C sequestration in Misc-GL (503 kg C ha−1 yr−1) was higher than that in Cryp-FP (284 kg C ha−1 yr−1). This was likely the result of larger C input from aboveground litter to soil, C-quality (C:N ratio and lignin concentration in aboveground litter) and possibly more recalcitrant C (charcoal) inputs by annual burning. The difference in soil δ15N between sites indicated that organic C with N had greater cycling between heterotrophic microbes and soil and produces more recalcitrant humus in Misc-GL than in Cryp-FP. Our data indicate that in terms of soil C sequestration, maintenance of Misc-GL may be more advantageous than conversion to Cryp-FP in Aso, Japan.
Rights: This is the pre-peer-reviewed version of the following article: GCB Bioenergy. 4(5):566-575, 2012.9., which has been published in final form at http://onlinelibrary.wiley.com/doi/10.1111/j.1757-1707.2012.01160.x/abstract
Type: article (author version)
URI: http://hdl.handle.net/2115/50450
Appears in Collections:北方生物圏フィールド科学センター (Field Science Center for Northern Biosphere) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 山田 敏彦

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