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根据子代测定结果和当代表现等因子对湿地松种子国进行疏伐,使种子园的结实量成倍增加,强度伐的结实株百分率为62％;中度伐的为39％,轻度代的为28％,不疏伐的为22％,单株产种量的比例为:不疏伐100％:轻度伐120％:中度伐200％:强度代400％;每公顷产种子量的比例为:不疏伐100％:轻度代119％:中度伐208％:强度伐411％。当种子园进入结实盛期时,每公顷保留120—150株是合理的,如果无性系的营养生长和生殖生长能力特别强,每公顷保留90—120株即可。当具有结实能力的母树直径达30cm以上,冠幅达8—10米时,每株年产种子0.5—1.5公斤,每公顷年产种子60—150公斤是完全可以达到的。
According to the results of the offspring determination and the contemporary performance and other factors, the seedling kingdom of P. elliottii was dredged so as to double the seedling yield of the seed orchard. The percentage of stubble plants was 62% in the intensity cutting and 39% in the moderate cutting, Of the total yield is 28% and the percentage of non-thinning is 22%. The proportion of single plant is: not thinning 100%: mild cutting 120%: moderate cutting 200%: strength generation 400% The ratio is: not thinning 100%: mild on behalf of 119%: moderate cutting 208%: 411% strength cut. When the seed orchard is in its peak, it is reasonable to keep 120-150 plants per hectare. If the vegetative and reproductive capacity of the clones is particularly strong, 90-120 plants per hectare can be reserved. When the parent tree with strong ability of more than 30cm in diameter, crown width of 8-10 meters, 0.5-1.5 kg per annual yield of seeds, 60-150 kg per hectare annual output of seeds is completely achievable.