This
research was carried out to estimate the winter fluxes of CO2 and CH4
by the concentration
profile method (indirect) and the chamber method (direct) at black spruce
forest soils of central Alaska during the winter 2004/5. The average winter
fluxes of CO2 and CH4 by the indirect and direct methods
were 0.24±0.06 (SE; standard error) and 0.21±0.06 gCO2-C/m2/d,
and 21.4±5.6 and 21.4±14 µgCH4-C/m2/h, respectively. The fluxes estimated by two methods are not a
significant difference based on a one-way ANOVA with a 95% confidence
level. The winter CO2 flux
corresponds to 30% of the annual CO2 emitted from Alaskan black
spruce forest soils. The average winter
emissions of CO2 and CH4 were 49±13 gCO2-C/m2
and 4.5±3.0 mgCH4-C/m2, respectively. This suggests that the winter emissions of CO2
and CH4 are an important part of the annual carbon budget in
seasonally snow-covered terrain.
Author: Yongwon Kim, Masa Ueyama, Noriyuki Tanaka, et al (kimyw at iarc dot uaf dot edu)
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