摘要
天然落叶松老龄林每1个种子年后第2年,林地表面即会出现大量天然幼苗100-270株·m-2.幼苗发生时间集中,绝大多数在6月底.赤杨落叶松林幼苗发生较丛桦落叶松林和杜香落叶松林的迟.幼苗死亡时期也集中,主要在幼苗发生后的15天内.其间杜香落叶松林的幼苗死亡率为48%,3年内97%;丛桦落叶松林为29%和66%;赤杨落叶松林为33%和69%.7月以后发生的幼苗存活率很低,早期发生的幼苗占优势,死亡率低.丛桦落叶松林和杜香落叶松林幼苗的早期优势显著,尤其是杜香落叶松林.幼苗存活的年际变化很大,落叶松幼苗数量丛桦落叶松林>赤杨落叶松林>杜香落叶松林.
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. gmeliniAlnus mandshurica forest is later than in L. gmelini-Betula fruticosa and L. gmeliniLedum palustre forests. The seedlings have a mortality of 48% within 15 days and of97% in 3 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.
出处
《应用生态学报》
CAS
CSCD
1995年第2期113-118,共6页
Chinese Journal of Applied Ecology
基金
国家自然科学基金
关键词
兴安落叶松
生命统计
幼苗
种群
老龄林
Larix gmelini, Demography, Seedling population, Old-growth forest,Daxinganling Mts.