Soil Freezing and Wintertime Soil CO2 Concentration Affected by Interannual Climate Conditions in the Central Mountainous Area, Japan

DOI Web Site 2 Citations 37 References
  • HAMADA Yohei
    Faculty of Environmental Earth Science, Hokkaido University
  • TANAKA Tadashi
    Graduate School of Life and Environmental Sciences, University of Tsukuba Present: Beijing Office, Department of International Affairs, University of Tsukuba

Bibliographic Information

Other Title
  • 「中部山岳地域における土壌凍結および冬季土壌ＣＯ２濃度の年々変動とそれに及ぼす気象条件の影響
  • チュウブ サンガク チイキ ニ オケル ドジョウ トウケツ オヨビ トウキ ドジョウ CO2 ノウド ノ ネンネン ヘンドウ ト ソレニ オヨボス キショウ ジョウケン ノ エイキョウ

Search this article

Description

The relationship between soil freezing and related environmental factors is essential to predict wintertime hydrological phenomena in cold regions. We conducted monthly observation of soil frost depth and the related factors from 1996 to 2003 at a forested headwater basin located in the Central Mountainous Area, Japan. Annual maximum depth of soil frost (Dmax) had a clear negative correlation with that of snow cover, because of the effect of thermal insulation. A modified freezing index, which integrates the effects of atmospheric temperature and snow cover, also had a good correlation with Dmax. The correlation predicted that the soil would not freeze if this index decreased by approximately 80 %, and such a decline would easily occur by thick snow cover. Multisite observation along a transect in the winter of 2001-2002 suggested that these relationships largely depended on the aspect of the slope. Soil freezing prevented soil CO2 from evolving into the atmosphere resulting in temporary increase in CO2 concentration under the frozen layer. Wintertime maximum CO2 concentration at each depth generally increased with Dmax, but this correlation became unclear in Dmax>10 cm. To predict the response of soil freezing to climate change near future, depth of snow cover will be important as well as temperature rise in winter.

Journal

Citations (2)*help

See more

References(37)*help

See more

Keywords

Details 詳細情報について

Report a problem

Back to top