丹沢山地札掛地区における植物成長期のニホンジカの食物利用可能量

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The biomass of undergrowth and food availability for Sika deer (Cervus nippon) were measured by a quadratic method (1m×1m and 2m×2m in size) in clear-cut, unplanted stands of 2-8 years of age and young sugi (Cryptomeria japonica) plantations of 2-24 years of age in Fudakake, Tanzawa Mountains, central Honshu, Japan, in 1974. The biomass of available food decreased from over 200g/m^2 (Dry) two years after clear-cutting to a level of 50% to 70% lower 8 years after clear-cutting due to the dominance of an unpalatable plant (Miscanthus sinensis) and other woody plants. The undergrowth biomass exhibited a similar trend. The biomass of undergrowth as well as the biomass of available food was significantly larger in moderately moist brown forest soil (B_D) than in eroded soil (Er). In sugi plantations having the B_D soil type, the undergrowth biomass and available food biomass were reduced by yearly weeding to the levels of the Er soil type.