Relationship between specific leaf area of aCryptomeria japonica foliage shoot segment and its diameter |
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Authors: | Masumi Katsuno Kazuo Hozumi |
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Institution: | (1) Laboratory of Silviculture, Faculty of Agriculture, Nagoya University, 464 Nagoya, Japan |
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Abstract: | Dependency of specific leaf area (SLA) on shoot diameter (x) was studied forCryptomeria japonica foliage shoot segments about 5 cm in length taken from 18 branches at different height levels on 3 trees in August 1987.
The leaf area of a shoot segment (S) was defined as half the sum of the needle area (s) estimated by the allometric relationship betweens and needle length. The dry weight of woody tissue (W
w) and needles (W
n) of a segment and itsS were divided by the segment length (L) to give linear densities asW
w/L,W
n/L andS/L, respectively. The densities were related tox by power-form equations.S/L values tended to be constant around 1.2 cm2 cm−1] within the discussed range ofx, whileW
w/L andW
n/L values clearly increased withx. The approximately reciprocal relationship between average needle area (s) and linear density of the number of needles supported
the fact thatS/L values were roughly constant regardless ofx.SLA andSNA were defined asS/(W
w+W
n) andS/W
n, respectively. TheSLA-x relationship expected from the average value ofS/L and theW
w/L-x and theW
n/L-x relationships was well fitted to the observed decrease inSLA with increasingx. SNA also decreased asx increased. Variations inSLA andSNA among the shoot segments with similarx were not systematically related to their height levels. An empirical equation with a maximum value ofx (Xmax) was also proposed in order to formulate theSLA-x relationship. |
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Keywords: | Cryptomeria japonica Linear density of foliage area Shoot segment diameter Specific leaf area |
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