Effects of short-rotation harvesting on soil microbial biomass and nitrogen mineralization in Gmelina arborea plantations in East Kalimantan

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  • KITA Satoshi
    Center for ecological research, Kyoto University
  • AGUS Cahyono
    Faculty of Forestry, Gadjah Mada University
  • TODA Hiroto
    Faculty of Agriculture, Tokyo University of Agriculture and Technology
  • HAIBARA Kikuo
    Faculty of Agriculture, Tokyo University of Agriculture and Technology

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In order to elucidate the effects of short-rotation harvesting on microbial biomass and nitrogen (N) mineralization in soil, we studied Gmelina arborea Roxb. (yemane) plantations and the mixed planting of a legume cover crop in East Kalimantan. The microbial biomass carbon (MBC) and microbial biomass nitrogen (MBN) decreased by approximately 40 % to 50 % in the plantation plots than in a secondary forest plot. The MBC increased with the stand age in the plantation plots, while the MBN remained low. In a mixed plot of yemane and legumes, the MBC, MBN, and N mineralization rate were approximately the same as those in a 10-yr plantation plot without cutting; however, these values were higher than those in a 4-yr coppice plot after the cutting of a 6-yr plantation. Mixed planting of a legume cover crop might influence the soil nutrition by N2 fixation. The percentage of the MBN in the total N in the plantation plots was lower than that of the MBN in the total N in the secondary forest plot because the rate of decrease in MBN was higher than that in the total N due to clear-cutting and plantation.

収録刊行物

  • Tropics

    Tropics 17 (3), 251-259, 2008

    日本熱帯生態学会

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