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[B-1.7.2 Quantitative Analysis of Carbon Flow through Soil Microorganisms in the Boreal Forest Ecosystem]

[Contact Person]

Takao Horikoshi
Professor
Dept. of Environmental Studies, Faculty of Integrated Arts and Sciences,
Hiroshima Univ.
Kagamiyama 1-7-1, Higashi-hiroshima 739 Japan
Phone +81-824-24-6509, Fax +81-824-24-0758

[Total Budget for FY1993-FY1995]

19,569,000 Yen (FY1995 5,175,000 Yen)

[Abstract]

In order to clarify the role of microorganisms in the carbon cycle of the boreal forest ecosystem, vertical distributions of soil carbon, soil microbial biomass and microbial activity were studied in a black spruce forest near Candle Lake, Saskatchewan, Canada. Soil microbial biomass was largest in the FH horizon. Soil respiration rate measured using a portable infrared gas analyzer was highest in the FH horizon exceeding 50% of the total CO₂ emission from soil surface. Low but significant CO₂ emission was detected in deeper soil horizons(E and B). Root respiration represented about 54% of the total soil respiration. The amount ofcarbon evolved through microbial respiration was estimated as 283 gC m^-2 yr^-1. To study the effect of climatic conditions on litter decomposition, the relationship between temperature condition and mass loss rate of moss litter was also examined.

[Key Words]

Boreal Forest, Carbon, Microorganism, Soil