Estimation of leaf area at the level of branch,tree and stand inCryptomeria japonica |
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Authors: | Masumi Katsuno Kazuo Hozumi |
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Institution: | (1) Laboratory of Silviculture, Faculty of Agriculture, Nagoya University, 464-01 Nagoya, Japan |
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Abstract: | The frequency distribution of diameter (x) in foliage shoot segments, ø(x), was examined in 18 branches at different height levels of three trees in a 25-yr-old sugi (Cryptomeria japonica D. Don) plantation. The ø-x relationships were approximated by power-form equations, in which the exponent differed among the branches from ?0.6 to ?4.2. Leaf area (S B) and leaf weight (W B) of a branch were estimated on the basis of the ø-x relationship, and the dependency of specific leaf area (SLA 0) and density (ρ 0) of a foliage shoot segment on itsx. SLA B value of a branch defined byS B/W B ranged from 27 to 80 cm2 g. d.w.?1 according to the exponent in the function of ø(x). Total leaf area (u) and leaf weight (wl) of a tree were estimated by summation ofS B andW B for seven sample trees. TheSLA T value of a tree defined byu/wl ranged from 65 to 76 cm2 g d.w.?1 and increased with stem diameter at clear length (D B). By use of the allometric equations betweenu andD B,LAI of the plot was estimated to be 17.3 ha ha?1 (half of the total surface area of needles). By a process similar to that used for calculatingLAI, the amount of woody tissues included in sugi foliage was evaluated to be about 10% of the stand foliage biomass. |
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Keywords: | Amount of woody tissues Cryptomeria japonica Diameter distribution Leaf area Specific leaf area |
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