放牧草地におけるチモシーの倒伏茎からの個体再生産

概要

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Regeneration from lodging tiller (RN) of timothy (Phleum pratense L.) were studied in a pasture in Shizunai, Hokkaido. Among examined 1912 plants of timothy, 71 plants were produced by RN. RN dispersed 13 cm in average from its parent. RN-ramets were generally born in autumn, most of which survived over winter. Four types of RN (NT-RN, NB-RN, TVT-RN, and TVB-RN) were identified on the bases of tiller types and size of tiller bud. Most of RN-ramets were originated by TVT-RN (Juvenile tiller on the top-vegetative elongated tiller). The establishment of RN-ramets were more frequent in semi-marsh and flat with light grazing pressure and many open patches, and less in marsh with light grazing pressure and flat with heavy grazing pressure and few open patches. These results show that the amounts of RN-recruitment are a few and different among the adjacent subpopulations.
1984-03-30