Effects of the Thinnings Windbreak Fence on Height Growth of the Coastal Forest

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  • 海岸林の樹高成長に及ぼす間伐材防風柵の効果
  • カイガンリン ノ ジュコウセイチョウ ニ オヨボス カンバツザイ ボウフウ サク ノ コウカ

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Two types of windbreak fence were developed by small log from thinning in order to preserve coastal forests. Based on a wind tunnel experiment for two kinds of windbreak fences (K-I and K-II), the effective area, whose wind speed was lower than 50% of relative wind speed, was extended over 26 H leeward. Both fences proved to be effective for wind control. Comparing these two fences, the K-II type was more effective for windbreak. We constructed these fences at the edge of a coastal forest in Yamagata Prefecture, and examined the effect of fences on wind speed, salinity and height growth of coastal forest consisting of the black pine (Pinus thunbergii). Remarkable decrease in wind speed and salinity were observed within the range of 30 m or less. The influence of the fences, however, was not significant in areas more than 30 m away. There were a few differences between the functions of two types of fence, and K-II showed a slightly better result based upon on-site observation. At the front area from forest edge to 30 m, height growth was not observed in a standard plot. In contrast, height growth in the K-I and K-II plots were good. The difference in the crown shape among plots in the front area affected height growth for leeward over 30 m. Height growth had been maintained for nine years in the plots with fence.

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