Abstract: Demography of Larix gmelini seedling population in natural old-growth forest of northDaxinganling Mts.show that after each fructification year, a great number of larchseedlings are emerged mainly in next June, and part of them died within a period of 15days after emergence.The emergence of L.gmelini seedlings in old-growth L.gmelini Alnus mandshurica forest is later than in L.gmelini-Betula fruticosa and L.gmeliniLedum palustre forests.The seedlings have a mortality of 48% within15 days and of 97% in3 years for L.gmelini-L.palustre forest, 29% and 66% for L.gmelini-B.fruticosa forest and 33% and 69% for L.gmelini-A.mandshurica forest.The seedlings emerged after July have a low survival rate, and appear a prominent advantage of early establishment in L.gmelini-B.fruticosa and L.gmelini-A.mandshurica forests, especially inthe latter.The annual survival rate of seedlings of different forests varies greatly, and decreases in order of L.gmelini-B.fruticosa, L.gmelini-A.mandshurica and L.gmelini-L.palustre.

Key words: Larix gmelini, Demography, Seedling population, Old-growth forest, Daxinganling Mts