Taking mother trees in clonal seed orchard of Pinus sylvestris var.mongolica in Cuohai Forest Farm of Longjiang County in Heilongjiang Province,the softwood cuttings in the same year and 1-year-old branches at different ages were dwarfed by pruning.Effects of dwarfing on seed setting and seed quality of mother trees in seed orchard were discussed.The truncated 7-8-year-old P.sylvestris var.mongolica mother trees has little effect on terminal bud of lateral branches of the crown,which can form optimal crown type.Truncation affect optimally the growth in the very year.In the self-pruning of new shoots in spring,the specific time is from the last ten days of May to the first ten days of June.The seed orchard of P.sylvestris var.mongolica can be dwarfed for three times while the age is 8,15 and 20 a.Single fruit quality is increased by 46.7％;the fruit yield of per plant is increased by 95.5％;the yield of seeds is increased by 1.07 times;the thousand grain quality of seeds is increased by 17.2％,respectively.The germination rate and germination energy are increased by 8.1％ and 3.1％,respectively.%以黑龙江省龙江县错海林场樟子松无性系种子园母树为研究对象,对不同年龄母树的当年生嫩枝及1年生老枝,采用不同修剪时间进行修枝矮化处理,探讨矮化处理对种子园母树结实及种子品质的影响.结果表明:7～8年生樟子松母树截顶,对树冠侧枝顶芽数量影响较小,可形成良好冠型;樟子松母树截头处理,在春天新梢封顶后进行效果较好,具体时间为5月下旬至6月上旬为宜.樟子松母树可在8年生、15年生和20年生时,分3次截头矮化处理,可有效控制结实高度.樟子松种子园矮化后母树单果质量提高了46.7％,单株结实量提高了95.5％,种子产量增加1.07倍,种子质量增加17.2％,发芽率和发芽势分别提高了8.1和3.1个百分点.
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