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This research was done to slow the decrease in the use of windbreaks by preparing windbreaks database showing their effectiveness in preventing wind damage in Otofuke, Tokachi region in Hokkaido, the northernmost prefecture in Japan. The main research method was using the windbreak data within the GIS (geographic information system). It was shown that the total length of windbreaks in Otofuke increased from 242.3 km in 1995 to 255.0 km in 2003, which was a 12.7 km increase in 8 years. It was shown that the tree species used in the windbreak in Otofuke are Larix kaempferi (Lamb.) Carriere (74.9%), Betula platyphylla sukatchev var. japonica (Miq.) Hara (9.5%), Abies sachalinensis Fr. Schm. (3.0%), Picea glehnii (Fr. Schm.) Masters. (0.5%) and other trees (12.1%). The tree trimming of windbreak of tree height over 20 m decreased at 54 km, and the planting of windbreak of tree height of 10 m or less increased 7 km. In spite of increased the extension of windbreaks slightly, the sheltered areas by windbreak decreased 1,400 ha. It was proved that the windbreak was useful for prevention of wind erosion damage through the relations between the sheltered areas by the windbreak and the place of the wind erosion damage.
This research was done to slow the decrease in the use of windbreaks by preparing windbreaks database showing their effectiveness in preventing wind damage in Otofuke, Tokachi region in Hokkaido, the northernmost prefecture in Japan. The main research method was using the windbreak data within the GIS (geographic information system). It was shown that the total length of windbreaks in Otofuke increased from 242.3 km in 1995 to 255.0 km in 2003, which was a 12.7 km increase in 8 years. It was shown that the tree species used in the windbreak in Otofuke are Larix kaempferi (Lamb.) Carriere (74.9%), Betula platyphylla sukatchev var. japonica (Miq.) Hara (9.5%), Abies sachalinensis Fr. Schm. (3.0%), Picea glehnii (Fr. Schm.) Masters. (0.5%) and other trees (12.1%). The tree trimming of windbreak of tree height over 20 m decreased at 54 km, and the planting of windbreak of tree height of 10 m or less increased 7 km. In spite of increased the extension of windbreaks slightly, the sheltered areas by windbreak decreased 1,400 ha. It was proved that the windbreak was useful for prevention of wind erosion damage through the relations between the sheltered areas by the windbreak and the place of the wind erosion damage.
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