新疆落叶松种子园嫁接母树结实规律研究

A Study on Seed-producing Law Plantation of Grafting Seed Trees in Xinjiang Larch Seed

对新疆落叶松初级种子园历年结实情况观测分析表明 :该树种 3～ 5a有 1次结实丰年 ;结果枝年龄为 2～ 5a,以 2龄枝结实最多 ,其结实量为 3,4龄枝的 2 .6和 1 0 .63倍 ;6龄以上枝条无结实能力 ,树冠自下而上单果体积增大、种子饱满、品质好 ;不同无性系间结实量和虫害率均表现出明显差异 ;2 5龄嫁接母树不同定植密度 ( 4m× 4m ,5m× 5m和 6m× 6m)间的结实量出现明显差异 ,密度越大。

The observation on the past years' seed-producing Xinjiang larch(Larix.sibirica) indicated that on the basis of biological characteristics and living environment conditions from tree abloom,the different clones existed significant difference in the seed quantity and the insect injury rate;the bearing branch age was 2-5 years,the branch was nuable to bear seeds when it was over 6 years,the most bearing age was in the 2nd year,the biggest seed set growth was 2.6～10.63 times more than 3～4 years' branch,increased the simple seed volume,and seed was fuller and quality better from lower crown to upper crown.There were great differences among the seed quantity in the differences plant density of 25-years' graft seed production.The denser was the stand of the seed trees,the smaller were the seeds produced.