京都府芦生にあるスギ人工林の二次師部生産速度

概要

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Annual production rate of secondary phloem and bark biomass were studied in the five Cryptomeria japonica plantations located on Tanba Hill north of Kyoto. Five to eight sample trees in each stand were felied and measured by stratified clip technique. Growth of the phloem in stem and branch was measured with stem analysis technique on the basic research for the structure of an annual growth layer in secondary phloem of C. japonica carried out by M. MIYAGAWA et al. The proportional relationship between annual growth rate of the phloem in stem and leaf dry weight per tree was recognized on logarithmic coordinates and the single regression represents for all sample trees among five stands. The ratio of annual growth rate of the phloem to that of stem wood per tree tends to increase with decreasing stem wood growth. Annual production rate of the phloem ranged from 0.557 to 0.829 t ha^<-1>y^<-1> for stem and from 0.094 to 0.298 t ha^<-1>y^<-1> for branch. These values in stem accounted for 8.1-20.4% of biomass of inner bark, 3.7-11.7% of stem bark biomass, 6.2-9.4% of stem wood production rate and 4.1-5.4% of net production rate of aboveground parts.
日本生態学会の論文
1981-12-30