HUSCAP logo Hokkaido Univ. logo

Hokkaido University Collection of Scholarly and Academic Papers >
Graduate School of Agriculture / Faculty of Agriculture >
Peer-reviewed Journal Articles, etc >

Effects of changes in the soil environment associated with heavy precipitation on soil greenhouse gas fluxes in a Siberian larch forest near Yakutsk

Files in This Item:
SSPN56-4_645-662.pdf3.16 MBPDFView/Open
Please use this identifier to cite or link to this item:http://hdl.handle.net/2115/46871

Title: Effects of changes in the soil environment associated with heavy precipitation on soil greenhouse gas fluxes in a Siberian larch forest near Yakutsk
Authors: Koide, Takahiro Browse this author
Saito, Hideyuki Browse this author
Shirota, Tetsuoh Browse this author
Iwahana, Go Browse this author
Lopez, C. M. Larry Browse this author
Maximov, Trofim C. Browse this author
Hasegawa, Shuichi Browse this author
Hatano, Ryusuke Browse this author
Keywords: Fick's law
greenhouse gas
irrigation
Siberian Taiga
trenching method
Issue Date: Aug-2010
Publisher: Blackwell Publishing
Journal Title: Soil Science & Plant Nutrition
Volume: 56
Issue: 4
Start Page: 645
End Page: 662
Publisher DOI: 10.1111/j.1747-0765.2010.00484.x
Abstract: A future increase in heavy precipitation events is predicted in boreal regions. An irrigation experiment was conducted in Taiga forest in eastern Siberia to evaluate the effect of heavy precipitation on greenhouse gas (GHG; CO2, CH4, and N2O) fluxes in the soil. The GHG fluxes on the soil surface were measured using a closed-chamber method and GHG production rates in the mineral soil were estimated using the concentration-gradient method based on Fick's law. Irrigation water (20 mm day^[-1]) was applied continuously for six days (120 mm in total; the same amount of summer precipitation in this region). Greenhouse gas production rates in the organic layer (O-layer) were defined as the difference between the GHG fluxes and the GHG production rates in the mineral soil. Carbon dioxide flux was measured both in root-intact (Rs) and trenched plots (Rmw). The root respiration rate (Rr) was calculated as the difference between Rs and Rmw. Considering root distribution in the soil, we regarded CO2 production rate in the mineral soil as microbial respiration rate in the mineral soil (Rmm) and microbial respiration rate in the O-layer (Rmo) as the difference between Rmw and Rmm. Irrigation increased both soil temperature and moisture in the irrigated plot. The Rs, CH4 flux and N2O flux during the irrigation period were higher in the irrigated plot than that in the non-irrigated plot (P < 0.05; mean Rs ± S.D. (mg C m^[-2] h^[-1]) were 171 ± 20 and 109 ± 11, mean CH4 flux ± S.D. (μg C m^[-2] h^[-1]) were -5.4 ± 4.1 and -14.0 ± 6.5, and mean N2O flux ± S.D. (μg N m^[-2] h^[-1]) were 1.6 ± 1.6 and 0.2 ± 1.1, respectively). Soil moisture affected positively on Rmm and CH4 production rate in the O-layer, a negatively on Rr, and did not affect Rmo, the CH4 production rate in the mineral soil, and the N2O production rates in both the O-layer and the mineral soil. Soil temperature had a positive effect on Rr and Rmo. The increment of global warming potential of the soil mainly due to the increase in microbial respiration rates. Future change in precipitation patterns in this region would accelerate decomposition of the soil organic matter.
Rights: The definitive version is available at www.blackwellsynergy.com
Type: article (author version)
URI: http://hdl.handle.net/2115/46871
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: 小出 隆広

Export metadata:

OAI-PMH ( junii2 , jpcoar )

MathJax is now OFF:


 

 - Hokkaido University