更新修剪对衰老‘富士’苹果枝条生长及树冠结构的影响

为探寻更新修剪对衰老期‘富士’苹果枝条生长及树冠结构的影响,以长放修剪为对照,测定了枝条生长动态、树冠结构及果实产量和品质。结果表明:不同修剪的发育枝和果台副梢生长动态均为单峰曲线。更新修剪的发育枝长度和粗度分别增加了63.92%和20.93%,果台副梢分别增加了51.14%和9.76%;相同树冠体积徒长枝,长、中枝和营养枝的数量分别增加了132.93%、82.59%、54.47%和76.84%,短枝、叶丛枝和结果枝分别降低了28.84%、31.57%和22.64%;单株树冠体积缩小了14.53%,枝条总量降低了27.82%;叶面积指数、平均叶倾角和消光系数分别提高了9.64%、153.22%和2.97%,冠层开度降低了13.15%;单果质量和产量分别提高了23.61%和30.02%,但对果实食用品质无显著影响。

Effects of renewal pruning on shoot development and crown structure of the aging Fuji apple tree

This paper is concerned on the effects of renewal pruning on shoot growth and crown structure of the aging Fuji apple tree.The long-branch pruning was used as control.The measured parameters were included shoot growth dynamics,crown structure change,fruit yields and quality.The results showed that both newly-developed shoots and lateral shoots of bearing part of different treatments were of character with a single growth peak.The length and diameter of the newly-developed shoots due to pruning were increased by 63.92% and 20.93% respectively,whereas by 51.14% and 9.76% respectively for the lateral shoots of bearing part.In same crown size,the numbers of water branch,long and medium branch and foliage branch were increased by 132.93%,82.59%,54.47% and 76.84% respectively,but short branch,leafage branch and fruit branch by 28.84%,31.57% and 22.64% respectively.However,the canopy of the pruned tree was reduced by 14.53%.Total number of branches was also reduced by 27.82%.Leaf area index,average foliar obliquity and extinction coefficient were increased by 9.64%、153.22% and 2.97% respectively.The canopy openness was reduced by 13.15%.The fruit weight and fruit yields were increased by 23.61% and 30.02% respectively.The renewal pruning had no significant effect on fruit eating quality.