1989年大兴安岭图强林业局兴安落叶松结实状况

Fruitage of Larix gmelinii in 1989 in Tuqiang Forestry Bureau Jurisdiction Area of the Greater Xingan Mountains.

种源是森林天然更新和人工促进森林天然更新的重要条件。但是,种源并非年年都是丰富的,因为,树木不是每年都结实,而有丰年与歉年之分。兴安落叶松(Larix gmelinii),据研究从1957—1988年有7次种子年,结实与气候因子有关。此外,不少树种的结实规律也受到采伐和火灾的干扰。

Researches on the fruiting pattern and its fluctuation of Larix gmelinii have great significance in seed collection and forest regeneration.As the investigations indicate,the fruitage of Larix gmelinii in 1989 is in mid-level.For trees with dbh over 16cm,60% are fruited.The fruiting rate and seed production increase with increasing dbh,and for trees with dbh over 24cm,they are significantly greater.Serious seed infestations by insect pests are also found .The period of seed dispersal is quite short.It begins at the first ten days and ends at the last ten days of September.