Productivity and mineral cycling in an oak coppice forest 2. Annual net production of the forest |
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Authors: | Makoto Kimura Masaki Funakoshi Shinpei Sudo Takehiro Masuzawa Toshie Nakamura Kozue Matsuda |
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Institution: | (1) Department of Biology, Faculty of Science, Tokyo Metropolitan University, Setagaya, 158 Tokyo;(2) Present address: Department of Biology, Faculty of Science, Shinshu University, 390 Matsumoto;(3) Present address: Second Department of Physiology, Kanazawa Medical University, Uchinada, Kahoku-gun, 920-02 Ishikawa;(4) Present address: Department of Biology, Faculty of Science, Shizuoka University, 420 Shizuoka |
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Abstract: | Annual net production was estimated in the secondary coppice forest near Tokyo, which was dominated by a deciduous oak,Quercus serrata Thunb. Lateral growth of stems and old branches was directly estimated by examining the annual rings for 35 shoots in a clear-cut
quadrat of 10m×10m. Phytomasses of current organs were also weighed in the quadrat. Preharvest losses of current organs were
determined by twelve 0.5 m2 litter traps for fine litter and twelve 6 m2 quadrats for woody litter. Branch production was also assessed indirectly by use of the stem-branch allometry and death of
branches. The results of the indirect method were in sufficient agreement with the result of the direct one. Grazing loss
of leaves from the canopy was estimated directly from the loss in leaf area and indirectly from the animal faeces caught by
the litter traps.
Net production of the canopy trees was 149 kg a−1 year−1, in which leaf production was 36.9 kg. Animals grazed about 14% of the leaf area by the end of the growing season. True consumption
of leaves by animals was 7.6% of leaf production or 10% of leaf mass. Production of undergrowth, mainly a dwarf bamboo,Pleioblastus chino Makino, was 28 kg a−1 year−1, being 15% of the total stand production.
Productivity of this forest was significantly higher than that of cool-temperate deciduous broadleaf forests. |
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Keywords: | Branch production Coppice Forest productivity Grazing loss Preharvest loss Quercus serrata |
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