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Factors controlling soil microbial respiration during the growing season in a mature larch plantation in Northern Japan

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Title: Factors controlling soil microbial respiration during the growing season in a mature larch plantation in Northern Japan
Authors: Qu, Laiye Browse this author
Kitaoka, Satoshi Browse this author
Koike, Takayoshi Browse this author →KAKEN DB
Keywords: Aboveground litter
Japanese larch forest
Soil microbial biomass
Soil microbial respiration
Soil temperature
Issue Date: Mar-2018
Publisher: Springer
Journal Title: Journal of Soils and Sediments
Volume: 18
Issue: 3
Start Page: 661
End Page: 668
Publisher DOI: 10.1007/s11368-017-1799-9
Abstract: Soil microbes contribute significantly to soil respiration (SR) in boreal forests; however, there is limited knowledge on microbial contributions from long field investigations. The objective of this study was to estimate soil microbial respiration, as well as its primary controlling factors, for a period of three consecutive years. A trenching method was used to distinguish soil microbial respiration (R (Mic)) in a 55-year-old mature Japanese larch (Larix kaempferi) plantation in Northern Japan; the soil in which developed originally from volcanic soils containing pumice. We used a portable CO2 detection system to measure the soil respiration rate during the growing season. Environmental factors, soil physiochemical characteristics, and soil microbial biomass carbon and nitrogen (MBC and MBN) were analyzed to explain the seasonal variations of SR and R (Mic). The results showed that the estimated contribution of soil microbes to SR was 78, 62, and 55% during the three successive years, respectively. Respiration attributable to decomposition of aboveground litter contributed approximately 19% to SR. The major environmental factor that affected R (Mic) was soil temperature at 5 cm depth, which accounted for more than 70% of the seasonal variation in R (Mic) observed. There were close relations among MBC, MBN, and soil water content, but the soil water content showed no significant relation with R (Mic). The R (Mic) to SR varied from 78 to 55% following 3 years of trenching treatments. Our results demonstrated the important role of soil microbes on soil respiration in this larch forest. Soil temperature was the major positive factor that influenced R (Mic), while soil water content had no significant effect. Global warming will increase the loss of C into the atmosphere by increasing the R (Mic,) and could accelerate climate change.
Rights: © Springer-Verlag GmbH Germany 2017. The final publication is available at
Type: article (author version)
Appears in Collections:農学院・農学研究院 (Graduate School of Agriculture / Faculty of Agriculture) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 小池 孝良

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