菅平地方における植物遷移の研究(2)

概要

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In the previous paper of this series, Polygonum persicaria and Erigeron strigosus were regarded as first and secondary pioneer species at Sugadaira, respectively. The Miscanthus sinensis community was described as a perennial grass stage of succession in the same paper. In the present work, the productive structure was investigated on the communities dominated by P. persicaria, E. strigosus and M. sinensis. The Polygonum community, an initial stage on the abandoned field has many leaves in the upper layer of the community and the leaf area index (LAI) is 2.7. On the contrary, in the community of E. strigosus, most of the leaves are within the height of 30cm above the ground and LAI is 1.9. The Miscanthus community contains 8.6 leaf layers in the stand. The differences of the location and the number of the leaf-layers of these communities cause the difference of the light condition inside the communities. The seedlings with small shade tolerance can not grow in the Polygonum community, while in the Erigeron community, these seedlings can grow, because the light penetrates the community. The differences of the productive structure among these communities are based on the differences of life cycle or growth form of the dominants. The aut ecological characteristics of these species as the motive force of plant succession were examined.
1969-04-01