SECONDARY SUCCESSION OF HERBACEOUS COMMUNITIES IN JAPAN : SEED PRODUCTION OF SUCCESSIONAL DOMINANTS

(Sn) of plants of successional studied. or D2ff) for each species, except Miseanthus sinensis. The relationship between Sw and X was obtained by multiplying the seed of each species. censtants g and equatien of g(DH)h eana-densis and 32.96 and 1.47 for Oenothera parvijZora (dominants of winter annual stage), 1.21 and 2.02 for Artemisia prineeps (dominant of perennial herb stage). The pioneer species produced a relatively small number ofheavy seeds. Whereas dominants of thewintex annual stage produced a vast number ef light anemochere seeds. Total seed number mr2 produced by the stands were 144,222 for P. persicaria. 2,744,OlO for E. annuus and 223,408 for A. princeps-Oe. parvij7bra. The weight of seod biomass to total biornass ofthe stands decreased from pioneer to final stages of succession of herbaceous com-rnunities. The seecl production is discussed in relation to the type of lifo history of each species.