Dry Matter Partitioning in Seedlings and Sprouts of Several Deciduous Broad-leaved Tree Species : with Special Reference to the Functions of Tree Architecture

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  • Ito Satoshi
    Research Devision of Univeristy Forests, Faculty of Agriculture, Kyushu University

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Other Title
  • 落葉広葉樹数種における実生及び萌芽稚樹の物質分配特性 : 樹形の機能に関連して
  • 落葉広葉樹数種における実生および萌芽稚樹の物質分配特性--樹形の機能に関連して〔英文〕
  • ラクヨウ コウヨウジュ スウシュ ニ オケル ミショウ オヨビ ホウガ チジュ

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Abstract

The growth characteristics of advance reproduction on the forest floor is an important factor in understanding the natural processes of forest regeneration. In this paper, the growth characteristics of seedlings and sprouts were analyzed for five deciduous broad-leaved tree species, Changes in growth characteristics induced by sprouting, (which modifies internal factors), are discussed from an ecological view point. The dry matter economy and three aspects of tree architecture, hydraulic, supportive and assimilative efficiencies were examined using several simple indices calculated from tree dimensions and dry matter allocation for seedlings and sprouts of Meliosma myriantha,Magnolia, obovata, Pterocarya, rhoifolia, Styrax japonicus and Styrux Shiraianus. Generally, sprouts increased their proportion of non-photosynthetic organs by sacrificing efficiency in matter economy, In particular, small-leaved or sympodial branching species, S. japonicus, S. Shiraianus and P. rhoifolis, modified their growth characteristics by sprouting from the 'waiting' growth (diameter-preferred growth) type to the 'competing' growth (elongation-preferred growth) type. The latter (competing) was observed in the seedlings of the large-leaved and monopodial branching species, M. myriantha and S. obovata. As a result of this change, small-leaved species and sympodial branching species tended to reduce supportive and assimilative efficiencies through sprouting. These characteristics in sprouts are thought to depend on the role of the original root system of the mother tree.

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