Abstract

Authors

NAKAI Yuichiro, MATSUURA Yojiro, KAJIMOTO Takuya, Anatoly P. ABAIMOV, YAMAMOTO Susumu, Olga A. ZYRYANOVA

Year

2008

Title

Eddy covariance CO₂ flux above a Gmelin larch forest on continuous permafrost in Central Siberia during a growing season

Journal

Theoretical and Applied Climatology

Volume

93

Page

133-147

DOI

doi:10.1007/s00704-007-0337-x

Keywords

URL

http://www.springerlink.com/content/t67743184hn17r45/

Abstract

Gmelin larch (Larix gmelinii) forests are representative vegetation in the continuous permafrost region of Central Siberia. Information on the carbon budget is still limited for this Siberian larch taiga in comparison to boreal forests in other regions, while the larch forests are expected to play a key role in the global carbon balance due to their wide distribution over North- East Eurasia. The authors reported results of eddy covariance CO₂ flux measurements at a mature Gmelin larch stand in Central Siberia, Russia (64°16'N, 100°12'E, 250 m a.s.l.). The measurements were conducted during one growing season (June-early September in 2004). CO₂ uptake was initiated in early June and increased sharply until late June, which was closely related to the phenology of the larch trees (i.e., bud-break and needle flush). Maximum half-hourly net CO₂ uptake was ~6 μmol m^-2s^-1. Maximum daily net uptake of ~2 gCmsup>-2day^-1 occurred at the end of June and in mid-July. Cumulative net uptake was 76-78 gCm^-2, indicating that the mature larch forest acted as a net sink for CO₂ during the growing season (91 days). In comparison with other boreal forests, however, the magnitude of net CO₂ uptake and night-time release of the forest, and cumulative net CO₂ uptake were lower. We suggest that lower net ecosystem CO₂ uptake of the study stand was primarily associated with low leaf area index.

Site

TUR

Remarks