树体管理对杂种落叶松球果产量的影响

Effect of Tree Management on Seed Yield of Hybrid Larch

探索落叶松结实性状与树体管理之间的关系,对黑龙江省林口县青山良种基地杂种落叶松二代园内8个无性系进行定干、截枝处理,并进行结实量调查分析。结果表明:树体管理能够提高结实量;截枝处理提高总结实量166%~335%,平均226%;定干处理会降低结实层高度,除定干3.5 m以外,其余处理使总结实量提高7%~146%,平均72%;定干+截枝处理的结实量不稳定,总结实量变化范围为-36%^+43%。定干可以使结实层下移:树冠低层结实量提高50%~207%,平均134%,树冠中层结实量提高28%~240%,平均113%。截枝处理可以提升树冠各层的结实量:高层结实量提升212%~373%,平均296%;中层结实量提升217%~360%,平均271%;低层结实量提升82%~295%,平均160%。3类处理提高结实量的效果由大到小依次为截枝、定干、定干+截枝。

The experiment was conducted to study the relationship between the fruiting characters and tree management of hybrid larch, eight clones of hybrid larch in the second generation garden of Qingshan seed base in Linkou County of Heilongjiang Province were treated with trunk or branch cutting, and then the seed yield was analyzed. The results showed that tree management could improve the seed yield;branch cutting could increase the seed setting by 166%-335%, average of 226%;trunk cutting reduced the height of the seed setting layer, but increased the seed yield by 7%-146%, average of 72%, except for treatment of 3.5 m;trunk+branch cutting was not stable, with a variation range of -36%-+43%. Trunk cutting could make the seed setting layer move down: the seed yield of the lower layer of the crown increased by 50%-207%, average of 134%;the seed yield of the middle layer of the crown increased by 28%-240%, average of 113%. Branch cutting can improve the seed yield of each layer of the crown: the seed yield in high layer increased by 212%-373%, average of 296%;the seed yield in middle layer increased by 217%-360%, average of 271%;and the seed yield in low layer increased by 82%-295%, average of 160%. The descending effect of three type’s treatments on seed setting was branch, trunk and trunk+branch cutting.