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B-6.3.1 Quantification of Soil Microbial Activity on Carbon Cycling in the Cool Temperate Forest

[Contact Person]

Shin-ichiro Mishima
Researcher
Dept. of Ecosystem Management
National Institute of Agro-Environmental Sciences
Ministry of Agriculture, Forestry and Fisheries
Kannondai 3-1-1, Tsukuba, Ibaraki, 305 JAPAN
Tel: +81-298-38-8224 Fax: +81-298-38-8220
E-mail: shin@ss.niaes.affrc.go.jp

Total Budget for FY1996-1998

7,506,000 Yen (FY1998;2,500,000Yen)

Abstract

This study aimed to model soil microbial decomposition activity, and quantify the carbon flow through soil microbial biomass. For this purpose, changes in the microbial biomass and correlations between temperature and metabolic quotient (MQ: respiration rate per unit of microbial biomass) were measured from April 1997 to March 1999 in two cool temperate deciduous forests. Using in situ soil temperature, CO₂ flux though the microbial biomass and CO₂ flux from the forest floor (microbial respiration + root respiration) based on past studies were estimated. The change of microbial biomass affects CO₂ flux through the microbial biomass, but the influence is much lower than that of temperature dynamics. The percentage of microbial CO₂ flux of total annual forest floor CO₂ flux was equivalent to past studies.

[Key Words]

Microbial Biomass, Soil Respiration, Forest Ecosystem, Carbon Cycling