Leaf biomass changes with stand development in hinoki cypress (Chamaecyparis obtusa [Sieb. et Zucc.] Endl.) |
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| Authors: | K. Ogawa S. Adu-Bredu T. Yokota A. Hagihara |
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| Affiliation: | (1) Laboratory of Forest Ecology and Physiology, Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya 464-8601, Japan;(2) Present address: Plant Production Division, Forestry Research Institute of Ghana, University P.O. Box 63, Kumasi, Ghana;(3) Department of Environmental Solution Technology, Faculty of Science and Technology, Ryukoku University, Otsu Shiga, 520-2194, Japan;(4) Laboratory of Ecology and Systematics, Faculty of Science, University of the Ryukyus, Okinawa 903-0213, Japan |
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| Abstract: | We monitored a permanent plot of 3-year-old Chamaecyparis obtusa seedlings for 11 years after planting. As the stem cross-sectional area at the crown base can be regarded as a good predictor of leaf mass according to the pipe model theory, we measured this parameter to determine temporal trends in leaf biomass. The mean values showed asymptotic growth, maintaining a near-constant level after a stand age of 9 years. Peak values were found at 9 years, followed by a slight decrease because of a continuous reduction in stand density. This temporal trend suggests that the leaf biomass per unit land area attains a peak at an age of 9 years. As the stand density changes with stand age, the relationship between stand stem cross-sectional area at the crown base and stand density showed an optimum curve in which the optimum density was around 9200 ha−1. We propose hypothetical trends in primary productivity and biomass density with stand age, based on the results of measurements of stem cross-sectional area at the crown base and stand density under the assumption of the 3/2 power law of self-thinning. |
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