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Effects of the expansion of vascular plants in Sphagnum-dominated bog on evapotranspiration

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Title: Effects of the expansion of vascular plants in Sphagnum-dominated bog on evapotranspiration
Authors: Hirano, Takashi Browse this author →KAKEN DB
Yamada, Hiroyuki Browse this author →KAKEN DB
Takada, Masayuki Browse this author
Fujimura, Yoshiyasu Browse this author
Fujita, Hiroko Browse this author
Takahashi, Hidenori Browse this author
Keywords: Dwarf bamboo
Eddy covariance
Energy balance
Groundwater level
Peatland
Warming
Issue Date: 15-Apr-2016
Publisher: Elsevier
Journal Title: Agricultural and forest meteorology
Volume: 220
Start Page: 90
End Page: 100
Publisher DOI: 10.1016/j.agrformet.2016.01.039
Abstract: Plant succession triggered by drainage, which results in the expansion or invasion of vascular plants, has been reported from many peatlands. However, the effects of the vascular plant's expansion on evapotranspiration (ET), which is a key component of the water balance of ombrotophic bog, are still contradictory. To investigate the effects, ET was measured at a Sphagnum-dominated bog and an adjacent transition peatland dominated by Sasa, dwarf bamboo, in Hokkaido Island, northern Japan, using the eddy covariance technique during the four growing seasons from 2007 through 2010. Cumulative gap-filled ET during a snow-free period of 6.5 months was 362(2008) and 374 mm (2010) at the Sphagnum site and 300 (2008) and 372 mm (2010) at the Sasa site. In the mid-growing season (late June to mid-September) with the highest leaf area index (LAI) at the Sasa site, ET was 2.14 +/- 0.03 (mean 1 standard deviation of the four years) and 1.92 +/- 0.19 mm d(-1), respectively, at the Sphagnum and Sasa sites. ET was smaller at the Sasa site, except for 2010 with an unusual hot wet summer; mean air temperature and precipitation were higher than their 30-year normal values by 1.75 degrees C and 172 mm, respectively. At the Sphagnum site, ET was stable despite such interannual variation in meteorological conditions. However, ET increased significantly at the Sasa site in 2010 probably because of LAI increase due to the enhanced growth of Sasa plants. The ET increase at the Sasa site suggests that ET will increase at the Sasa-dominated area, if the future warming environment accompanies more precipitation. (C) 2016 Elsevier B.V. All rights reserved.
Rights: © 2016, Elsevier. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
http://creativecommons.org/licenses/by-nc-nd/4.0/
Type: article (author version)
URI: http://hdl.handle.net/2115/68178
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: 平野 高司

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