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Forest decline caused by high soil water conditions in a permafrost region

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Title: Forest decline caused by high soil water conditions in a permafrost region
Authors: Iwasaki, H. Browse this author
Saito, H. Browse this author
Kuwao, K. Browse this author
Maximov, T. C. Browse this author
Hasegawa, S. Browse this author →KAKEN DB
Issue Date: 15-Feb-2010
Publisher: Copernicus Publications
Journal Title: Hydrology and Earth System Sciences
Volume: 14
Issue: 2
Start Page: 301
End Page: 307
Publisher DOI: 10.5194/hess-14-301-2010
Abstract: In the permafrost region near Yakutsk, eastern Siberia, Russia, annual precipitation (June-May) in 2005-2006 and 2006-2007 exceeded the 26-year (1982-2008) mean of 222±68mm by 185mm and 128 mm, respectively, whereas in 2007-2008 the excedent was only 48 mm, well within the range of variability. Yellowing and browning of larch (Larix cajanderi Mayr.) trees occurred in an undisturbed forest near Yakutsk in the 2007 summer growing season. Soil water content at a depth of 0.20m was measured along a roughly 400m long line transect running through areas of yellowing and browning larch trees (YBL) and of normal larch trees (NL). In the two years of supranormal precipitation, soil water content was very high compared to values recorded for the same area in previous studies. For both wet years, the mean degree of saturation (s) was significantly greater in YBL than NL areas, whereas the converse was the case for the gas diffusivity in soil. This implies that rather than mitigating water stress suffered during normal precipitation years, elevated soil water conditions adversely affected the growth of larch trees. Eastern Siberia's taiga forest extends widely into the permafrost region. Was such supranormal annual precipitation to extend for more than two years, as might be expected under impending global climate changes, forest recovery may not be expected and emission of greenhouse gas might continue in future.
Type: article
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: 長谷川 周一

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