Density effects on the growth of trees at early growing stage in alder (Alnus hirsuta var. sibirica) stand

Abstract

樹木の生長に及ぼす密度効果について立木密度の異なった4プロットで調べた。高密度区の樹木の直径生長率と樹高生長率は低密度区のそれより早くにぶった。D_o_2Hと樹木の各部分の重さとの相対生長関係は, プロット間で差がみられなかった。C-D効果は樹高生長より直径生長にはっきりあらわれた。高密度区の樹高の順位変動は低密度区に比べ著しかった。

Effects of stand density on the tree growth were investigated in four different planting plots. The growth rate of both diameter and height of trees in high density plots decreased earlier than those in low density plots seasonally. There were little difference in the allometric relationships to D02H (D0; diameter at base, H; tree height) and weight of each part among the plots. C-D effect was shown more clearly in diameter than in height of tree. The change of tree height ranking in high density plots was larger than in low density plots.