Seasonal Changes in Fine Root Biomass in a Chamaecyparis obtusa Endl. Forest

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  • ヒノキ林における細根量の季節変動
  • ヒノキリン ニ オケル サイコンリョウ ノ キセツ ヘンドウ

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Abstract

Seasonal changes in fine root biomass were studied from April to November in a 40year Chamaecyparis obtusa plantation at Mt Hiei, Shiga prefecture, Japan. Amounts of fine root were estimated using the core sampling methods. Fine root consisted of two sizes of roots; i.e less than 1mm and 1-3mm in diameter classes. The majority of fine root occured in the surface layer of 0-10cm soil corresponding to the upper mineral soil layer (A layer). The horizontal distiribution of fine roots was independent of the position of trees within the study site. Thus the soil core sampling methods were appropriate for the estimation of fine root mass in this study plot. Biomass of fine roots (size of less than 1mm) ranged from 2.0-3.0t/ha. Biomass of fine roots (size of 1-3mm) ranged from 0.83-1.31t/ha. Total root biomass ranged from 2.7-3.9t/ha. Production of fine roots was estimated by the seasonal changes in biomass, and was 1.32t/ha. The biomass and production of fine root estimated in this study were lower comparing with the other studies in the North American Coniferous forests.

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