Effect of clear-cutting and thinning on surface soil moisture conditions in a Hinoki (Chamaecyparis obtusa) stand

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  • ヒノキ林における皆伐および間伐が表層土壌水分状態に及ぼす影響
  • ヒノキバヤシ ニ オケル カイバツ オヨビ カンバツ ガ ヒョウソウ ドジョウ スイブン ジョウタイ ニ オヨボス エイキョウ

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Soil physical properties and soil moisture conditions were investigated on three experimental plots to study influence of forest treatment. Those plots comprised a clear-cut plot, thinned plot that was thinned 50%, and a control plot with standing trees. Those plots were settled in a Hinoki (Chamaecyparis obtusa) stand which was located at Mt. Tsubakuroyama, Ibaraki prefecture. Results of the investigation are as follows: 1) Volumetric contents of total soil pores at 10cm depth on each plot were 70-77%; those at 30cm depth were 65-73%. However, volumetric contents of total soil pores at each depth (10cm depth and 30cm depth) were almost equal among plots. 2) Size distributions of volumetric soil pore contents were nearly equal on each plot. 3) Soil pores were filled with water at each depth just after rainfall events that were over 20mm. Also, soils were drying during the no rainfall period. 4) Soil matric potential of the clear-cut plot was from -50 to -30kPa, seldom reaching -60kPa. Individual soil matric potentials of thinned plots and control plots were from -20 to -10kPa. Soil matric potential of the clear-cut plot was lower than the other plots. However, low soil matric potential periods were insufficiently long to prevent plants from smooth growth on each plot. 5) Soil moisture content of the clear-cut plot was less than the thinned plot and the control plot at each relief point. On the convex relief point, the clear-cut plot showed significantly less content than either the thinned plot or the control plot. On the other hand, there is not significant difference between the thinned plot and control plot. 6) Soil temperatures of the clear-cut plot and the thinned plot were higher than the control plot. In addition, soil temperature of the clear-cut plot was slightly higher than the thinned plot on the convex relief point. 7) Increase of soil moisture content of the clear-cut plot was greater than either the thinned plot or the control plot on the convex relief point after a rainfall event. On the other hand, soil moisture increase of the thinned plot was slightly greater than other plots on the concave relief point.

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