Abstract:

Based on the analysis of fruit regularity and the meteorologic data in the past years, it is found that the fruiting characteristic in Larix gmeliniihad obvious periodicity. A good harvest year occurred in 3 to 8 years, with the average 5.7 years. Neither good harvest years nor average harvest years occurred in a row. There were no significant correlations between the fruit yield, and the rainfall or the total day number of the temperature ≥10 ℃. A good harvest was closely correlated to the annual accumulated temperature reaching to about 1 880 ℃ day in the previous continuous two years. Disastrous weather in the periodof pollen dispersal and the growth of pollen tubes was the major constraint to seedproduction. Accordingly, three essential conditions are proposed to assure the high seedyield of Larix gmelinii.

Key words: Larix gmelinii, fruit regularity, influence factors