Rate of microbial respiration per unit biomass and carbon balance in a volcanic soil : Comparison among three land uses

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  • Sato Akira
    Faculty of Agriculture, Tokyo University of Agriculture and Technology
  • Seto Masayuki
    Faculty of Agriculture, Tokyo University of Agriculture and Technology

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Other Title
  • 火山灰土壌における微生物の単位バイオマス当たりの呼吸速度と炭素収支 : 三種の土地利用間の比較
  • カザンバイ ドジョウ ニ オケル ビセイブツ ノ タンイ バイオマス アタリ ノ コキュウ ソクド ト タンソ シュウシ 3シュ ノ トチ リヨウ カン ノ ヒカク

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Abstract

The seasonal changes in the microbial biomass and the rate of CO_2 evolution were examined in situ in a volcanic soil with different land uses (arable land, orchard and forest sites) in Tokyo. The microbial biomass of the soil at a depth of 0-20 cm was almost constant at 30 g C m^<-2> for the arable land, 35 g C m^<-2> for the orchard or 110 g C m^<-2> for the forest site. The relationship between the rate of CO_2 evolution (R, g C m^<-2> day^<-1>) and the soil temperature (t, ℃) at a depth of 5 cm was as follows: R=0.442e^<0.0655t> (r=0.91) for the arable land, R=0.544e^<0.0624t> (r=0.94) for the orchard or R=0.418e^<0.0833t> (r=0.97) for the forest site. The rate of CO_2 evolution under field conditions in the arable land, the orchard or the forest site was estimated to be 1.6 g C m^<-2> day^<-1> (600 g C m^<-2> year^<-1>), 1.7 g C m^<-2> day^<-1> (610 g C m^<-2> year^<-1>) or 1.3 g C m^<-2> day^<-1> (490 g C m^<-2> year^<-1>), respectively, by using the annual mean soil temperature of 20℃, 18℃ or 14℃, respectively. The contribution of the respiration from roots and visible invertebrates to the total soil respiration was relatively small, i.e., the amount of respiration from soil microbes in the arable land, the orchard or the forest site was estimated to be 99%, 89% or 77% of the total CO_2 evolution from soil, respectively. Based upon these results, the rate of microbial respiration per unit biomass was estimated to be 54, 43 or 9 mg C g^<-1> biomass C day^<-1> for the arable land, the orchard or the forest site, respectively. Assuming that the yield coefficient of the soil microbes is 0.1 under field conditions, it was suggested that the microbial biomass could reproduce only about twice a year in the arable land and the orchard site, or 0.3 times a year in the forest site.

Journal

  • Soil Microorganisms

    Soil Microorganisms 54 (1), 13-21, 2000

    Japanese Society of Soil Microbiology

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