Aboveground net production and dry matter allocation ofPinus pumila forests in the Kiso mountain range,central Japan |
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Authors: | Takuya Kajimoto |
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Institution: | (1) Laboratory of Silviculture, Faculty of Agriculture, Nagoya University, 464-01 Nagoya, Japan;(2) Present address: Tohoku Research Center, Forestry and Forest Products Research Institute, Nabeyashiki 72, 020-01 Shimokuriyagawa, Morioka, Japan |
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Abstract: | Aboveground net production rates of the subalpine stone pine (Pinus pumila) forests in central Japan were estimated by the summation method; net production was defined as the sum of annual biomass
increment and annual loss due to death. In the two pine stands of different scrub heights, P1 (200 cm) and P2 (140 cm), aboveground
biomass reached 177 and 126 ton ha−1, respectively. Leaf biomass was about 14 ton ha−1 in each stand. The estimates of aboveground net production during the 2 year period (1987–1989) averaged 4.1 and 3.7 ton
ha−1 y−1 in P1 and P2, respectively, which were at the lowest among the pine forests in the world. Two indices of efficiency of energy
fixation, that is, the ratio of net production to the total radiation during a growing season and the ratio of net production
to total radiation per unit of leaf weight, were evaluated. Both efficiency indices for the twoP. pumila stands fell in the range obtained for other Japanese evergreen conifer forests. This suggested that the low annual net production
of the stone pine stands were mainly due to a limitation in the length of the growing season. The pine forests were also characterized
by a small allocation (about 17%) of aboveground net production into biomass increment, in comparison with other evergreen
conifer forest types. Annual net carbon gain in theP. pumila forests was suggested to be largely invested in leaf production at the expense of the growth of woody parts. |
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Keywords: | aboveground biomass canopy structure dry matter allocation net production Pinus pumila |
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