Primary production of an evergreen broadleaved scrub growing on a clearcut buna forest site

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  • ブナ林の伐採跡に更新した常緑広葉樹エゾユズリハ群落の物質生産
  • ブナ林の伐採跡に更新した常緑広葉樹エゾユズリハ群落の物質生産(短報)
  • ブナバヤシ ノ バッサイアト ニ コウシンシタ ジョウリョク コウヨウジュ エ

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Abstract

Two plots of an Ezoyuzuriha(Daphniphyllum macropodum MIQ. var. humile ROSENTHAL) scrub were studied in northern Kyoto Prefecture. The scrub was regenerated from stolons about 13 years ago after the harvesting of a mature buna, Japanese beech (Fagus crenata BL.) forest mixed with mizunara, Japanese white oak (Quercus inongolica FISCH. var. grosseserrata REIIDM et WILS.) and sugi, Japanese cedar (Cryptomeria japonica D. DON). The biomass and net production rate of the above-ground parts were estimated with the clear-cutting methods. The values on Plot A were summed up from the weight of each tree within the quadrat, and those on Plot B from the biomass density of four blocks (each 2.5m×3.0m×0.5 (height) m in size). The leaf biomass (3.29_??_3.89t ha-1 in oven-dry weight) and the leaf area index (LAI) (2.4_??_2.7 ha ha-1) in October were small, in spite of being an evergreen broadleaved stand, and were equal to the mean value of many deciduous forests in Japan. Net production rates of above-ground parts (8.62_??_9.37t ha-1y-1) also were low. They well agreed with the mean value of cooltemperate deciduous broadleaved forests in Japan, but were smaller than the values obtained in evergreen coniferous plantations near the studied scrub. The biomass density ranged from 1.2 to 2.1kgm-3. Leaves were concentrated at the canopy surface, as in the herb type; leaf biomass density within the uppermost layer at 1.5_??_2.0m above the ground amounted to 0.76kg m-3 (97 percent of the total leaf biomass on the Plot B).

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