香川県小豆島の壮齢ウバメガシ林の物質生産

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  • カガワケン ショウドシマ ノ ソウレイ ウバメガシリン ノ ブッシツ セイサン
  • Dry-matter production of a middle-aged Quercus phillyraeoides stand at Shodoshima Island, Kagawa Prefecture

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We quantified dry matter production in a 50-year-old pure stand of Quercus phillyraeoides by destructively sampling the aboveground components of six trees and using the data to develop relationships between DBH^2 and various tree components. Aboveground biomass and production rates were estimated for the stand using these relationships and DBH data from a larger sample of living trees. The production rates (i.e., growth rates in dry weight) of stem and branches were obtained from the bulk density and volume increases over time measured by stem analysis. The aboveground biomass was relatively low at 250 t/ha, because tree height was only 9.5 m on average. However, the aboveground biomass density (dry weight divided by the 3-D space occupied by the stand) was quite high at 2.6 kg/m^3. Using values and relationships from other reports that have published, we summed production rates of the various tree components and determined the aboveground net production rate at 33.6 t/ha/yr, one of the highest values ever recorded for the generally productive lucidophyllous forests of Japan. Eighty-five percent of the leaf biomass was concentrated in the upper 2 m of the canopy layer. The high productivity of this typical single-stratum Q. phillyraeoides forest shows that these forests have an important role in carbon storage.

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