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根据辽宁省大孤家林场日本落叶松种子园种子产量和不同无性系结实习性等有关资料 ,对种子园不同年龄阶段生产率、结实规律等进行了系统分析。结果表明 ,用嫁接苗建立的日本落叶松初级种子园 ,1 6年前种子产量十分有限 ,年最高产种量仅 2 1 0kg/hm2 。园龄 2 2～ 2 6年生时大年种子产量虽可增加到 2 5 0 0kg/hm2 ,但这个年龄阶段的生产率仍然较低 ,仅 5 81kg/hm2 ·a。园龄 2 7～ 31年生时生产率才进一步提高到1 6 4 3kg/hm2 ·a。日本落叶松种子园大小年间种子产量变幅大 ,周期性明显 ,大年每隔 5～ 6年到来一次。种子产量与园龄、结实母株数量呈显著到极显著正相关 ,种子品质 (空粒率 )与园龄、结实母树数和种子产量呈显著的负相关。树高与球果产量的相关关系不显著 ,但大年球果产量与冠幅、胸径呈显著正相关。无性系间球果产量差异极为明显 ,结实前 3年和前 8年球果累计产量与各平年、大年和总产量间呈显著到极显著的正相关。丰产无性系早期选择可根据前 3年和前 8年球果产量分 2次进行。大小年产量相差悬殊、大年间隔期长和丰产无性系数量少是日本落叶松种子园生产率低下的重要原因
Based on the data of seed production and clonal habit of Japanese larch seed orchard in Dagoya Forest Farm in Liaoning Province, systematic analysis was made on the productivity and seed-setting regularity of seed orchard in different age stages. The results showed that the primary seed orchard of Larix principis-rupprechtii, which was established with grafted seedlings, had very limited seed yield sixteen years ago with the highest annual yield of only 210 kg / ha. Although the annual seed yield can reach 25000kg / hm2 at the garden age of 2 2 ~ 2 6 years, the productivity in this age stage is still low, only 5 81 kg / hm2 · a. When the garden age was between 27 and 31 years, the productivity was further increased to 1643 kg / hm2 · a. Larix kaempferia seed orchard seed size between the size of a large amplitude, periodic obvious New Year every 5 to 6 years time. There was a significant and significant positive correlation between seed yield and age and seed number. There was a significant negative correlation between seed quality (empty grain rate) and seedling age, seed number and seed yield. The correlation between tree height and coniferous yield was insignificant, but the yield of large annual coniferous seed was significantly and positively correlated with crown width and DBH. The difference in the yield of cones between clones was extremely significant. The cumulative production of cones in the first three years and the first eight years of seed setting was significantly and significantly positively correlated with the annual, annual and total yield of clones. Early selection of high yielding clones can be based on the first 3 years and the first 8 years of cones yield 2 times. Large differences in the annual output of large gaps in the New Year interval and a small number of high yield climbers is an important reason for the low productivity of Japanese larch orchards