Distribution of forests and warmth index in Toyama prefecture [Japan]
1991
Ishida, M.(Toyama-ken. Forestry and Forest Products Research Center, Imizu (Japan))
In Toyama prefecture, the relationships between the distributions of the forests and warmth index (warmth index; WI, coldness index; CI) were studied used by the vegetation maps and the meteorological mesh data files. Evergreen broad leaved forest zone (the region of CI-10, 1466squarekm, 35% of the area of Toyama pref.), warm-temperate deciduous forest zone (the region of WI85 and CI-10, 514squarekm, 12%), temperate deciduous forest zone (the region from WI85 to 45, 1670squarekm, 39%), (subalpine) evergreen coniferous forest zone (the region from WI15 to 45, 604squarekm, 14%)and alpine zone (the region of WI15, 4squarekm, less than l%)existed. In the order of these forest zones, the ratios of the area of the natural forest including the scrub in each forest zone were 13%, 47%, 76%, 80% and 50%. In evergreen broad leaved forest zone, the evergreen broad leaved forest occupied really only less than 1%, although oak forest (Quercus serrata community) occupied 90%. In the natural forest of evergreen coniferous forest zone, the evergreen coniferous forest (Abies mariesii community) occupied only 22%, and on the other hand beech (Fagus crenata) and birch (Betula ermanii) forest occupied 52%. It was recognized that the evergreen broad leaved forest and the evergreen coniferous forest did not developed so well as compared with warm-temperate and the temperate deciduous forest. Especially beech forest spreaded the range of the distribution in warm temperate forest zone and (subalpine) evergreen coniferous forest zone.
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