| |
|---|---|
 (270Kb)
|
25,510,000 Yen (FY1996 9,433,000 Yen)
We evaluated the forest fire occurs in Siberian larch forests established on permafrost area from various view points.
(1) We observed an increment of active-layer thickness, or distance from soil surface to permafrost, after one year of forest fire in a larch forest in central Siberia. Soil CO2 emission decreased after one year of forest fire because of damage of roots of vegetation by a forest fire. Soil CO2 emission closely related with a cover degree of lichens.
(2) We analyzed water which was running off two kinds of the forests before and after fire. Any ammonium and nitrate nitrogen were not observed in the water.
(3) We made a new chamber of 5m3 for non-destructive measurement of day-time respiration of above-ground parts of a whole plant.
(4) We found close relationships between respiration rates of root and stem, and the diameters of the parts. On the basis of the relationship, we estimated respiration rate of under-ground parts of whole plant without destruction using mathematical model.
(5) Ratio of respiratory consumption to gross production in a Siberian larch forest without fire was estimated to be 0.26. The value is the smallest one in various forests all over the world.
(6) We established the method to reconstruct the past structures, or density, stem volume, and stem volume growth and function, or respiratory consumption in a forest. Using the method, we estimated the past structure and function in a Siberian larch forest after a forest fire.
Global warming, Forest fire, Permafrost, Carbon budget