Carbon exchange rates in Polytrichum juniperinum moss of burned black spruce forest in interior Alaska

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概要

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• The Boreal black spruce forest is highly susceptible to wildfire, and postfire changes in soil temperature and substrates have the potential to shift large areas of such an ecosystem from a net sink to a net source of carbon. In this paper, we examine CO2 exchange rates (e.g., NPP and Re) in juniper haircap moss (Polytrichum juniperinum) and microbial respiration in no-vegetation conditions using an automated chamber system in a five-year burned black spruce forest in interior Alaska during the fall season of 2009. Mean ± standard deviation microbial respiration and NEP (net ecosystem productivity) of juniper haircap moss were 0.27 ± 0.13 and 0.28 ± 0.38 gCO2/m2/hr, respectively. CO2 exchange rates and microbial respiration showed temporal variations following fluctuation in air temperature during the fall season, suggesting the temperature sensitivity of juniper haircap moss and soil microbes after fire. During the 45-day fall period, mean NEP of P. juniperinum moss was 0.49 ± 0.28 MgC/ha following the five-year-old forest fire. On the other hand, simulated microbial respiration normalized to a 10°C temperature might be stimulated by as much as 0.40 ± 0.23 MgC/ha. These findings demonstrate that the fire-pioneer species juniper haircap moss is a net C sink in the burned black spruce forest of interior Alaska.

• 国立極地研究所の論文

著者

• Kim Yongwon

  International Arctic Research Center (IARC), University of Alaska Fairbanks

• Kim Yongwon

  International Arctic Research Center (IARC), University of Alaska Fairbanks (UAF), 930 Koyukuk Dr., Fairbanks, AK 99775-7335, USA

• Kodama Yuji

  Arctic Environmental Research Center, National Institute of Polar Research (NIPR), Tokyo 190-8518, Japan

• Shim Changsub

  Korea Adaptation Center for Climate Change, Korea Environment Institute (KEI), Seoul 122-706, South Korea

• Kushida Keiji

  College of Bioresource Sciences, Nihon University, Kanagawa 252-0880, Japan

関連論文

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• Characteristics of evapotranspiration from a permafrost black spruce forest in interior Alaska
• Seasonal changes in camera-based indices from an open canopy black spruce forest in Alaska, and comparison with indices from a closed canopy evergreen coniferous forest in Japan
• Sensitivity of the backscatter intensity of ALOS/PALSAR to the above-ground biomass and other biophysical parameters of boreal forest in Alaska
• The role of declining Arctic sea ice in recent decreasing terrestrial Arctic snow depths
• Latitudinal distribution of soil CO_2 efflux and temperature along the Dalton Highway, Alaska
• Carbon exchange rates in Polytrichum juniperinum moss of burned black spruce forest in interior Alaska

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