摘要
25～ 35年生兴安落叶松母树林丰产结构是密度为 30 0株 /hm2 ,Ⅰ级木占 75%、Ⅱ级木占 2 5%;偏雌、中间型、偏雄母树比例为 6∶0∶4,其球果产量为 2 0 3kg/hm2 ,种子品质也较好 .在促进开花结实措施中 ,以环状砍皮方法效果较好 ,结实率为 90 %、单株产量提高 60 %;施肥中磷肥的效果显著 ,其施肥量为 60 g/m2 .
High yield structure of xingan larch of 25～35 years old was studied.The density is 300 plant per hectare,the tree of grade Ⅰ occupied 75%,grade Ⅱ occupied 25%,the ratio of female and male is 6∶0∶4, it's yield of ball is 203 kg per hectare.seeds quality is better.Effects of ring barking is the best among the measure of promoting abloom and seed,setting percentage is 90%,single plant yield raised 60%.The effect of phosphoric fertilizer is significant,it's quantity is 60 g/m 2.
出处
《延边大学农学学报》
2000年第3期176-181,共6页
Agricultural Science Journal of Yanbian University
基金
"六五"
"七五"项目! (75 - 0 7- 0 1 - 2 7)
