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38,704,000 Yen (FY1993 14,129,000 Yen)
The purpose of our research project is to clarify the following four main areas for representative forests in the permafrost regions of Siberia in relation to the effect of global warming; 1)Estimation of forest biomass and carbon storage in forests and forest soils; 2)Dendroclimatological analysis of tree growth; 3)Estimation of yearly uptake of CO2 by forests and CO2 flux in forests; 4)Gas exchange capacity in representative tree species in relation to adaptation to environmental fluctuation. The field investigation in Yakutia was carried out in summer of 1992 and 1993. Total biomass of a Larix gmelinii stand was 271.5ton/ha/yr. Primary net production was estimated at 3.1ton/ha/yr. Leaf dry mass of 1.7 ton/ha/yr was about a half in Japanese larch forest. Carbon and Nitrogen storage of the forest soils were estimated on the both sides of the Lena River. Soils developed on the both sides had a big difference in organic- and inorganic-carbon storage. Tree ring analysis indicated a peculiar ca. 30-year cycle of growth shift events in larch. Characteristics of gas exchange capacity in major tree species and adaptability to elevated CO2 in birch were examined. Clear midday depression in photosynthesis occured in both larch and pine because of the low xylem water potential. Topographic characteristics in distribution of major tree species were clarrified by using a LANDSAT image. These field studies were carried out by support of Yakutsk Institute of Biology, Russian Academy of Science.
Siberian Forests, Permafrost, Carbon Budget, Forest Biomass, Dendroclimatology