南京林业大学学报（自然科学版）2017，Vol.41Issue(6)：8-12,5.DOI:10.3969/j.issn.1000-2006.201703025
环割和摘心对薄壳山核桃枝条生长和叶片碳氮代谢物积累的影响
Effects of ringing and cutting off growing-tip on shoot growth and carbon-nitrogen metabolite accumulation in leaves of pecan
摘要
Abstract
[Objective]The present study investigated reasonable and efficient pruning methods in pecan (Carya illi-noinensis), in order to provide a theoretical basis for cultivating a high-yield. [ Method] Different-size branches of'Pawnee', a 5-year-old pecan cultivar, were used as experimental materials to study the effects of ringing and cutting off the growing-tips on the growth of branches and the accumulation of carbon-nitrogen metabolites in leaves. [Results]The lengths of branches in group A (20-25 cm in length), B (30-35 cm in length) and C (40-45 cm in length) were lower than the control, while the diameters of A, B and C branches were higher than the control, after ringing treat-ments. The length of A branches was lower than the control by 22.09%, and the difference in diameter between the C branches and the control was the largest. The content of soluble sugar in leaves exhibited an increasing trend, while starch and soluble protein contents showed an up-down pattern. The content of carbon-nitrogen metabolites in the leaves of A, B and C branches was higher than that in the leaves of the control. The content of soluble sugars constantly in-creased, and other indices showed an increasing trend initially and then a decreasing trend. The length of the A, B and C branches was lower than the control, while the diameter and carbon-nitrogen metabolite content in all groups were higher than those in the control after cutting off the growing-tips. However, the carbon-nitrogen metabolite contents showed different trends among the groups. The average number of new developmental branches in group C was two, with a maximum length of 26. 75 cm and a maximum diameter of 8.86 mm. The content of carbon-nitrogen metabolites in group B was significantly different compared to that in the control. [Conclusion] The cutting off growing-tip treatment in-hibited the growth of branches in length, and promoted the growth of branches in diameter. Branches in group C sprouted buds, and showed the best response to treatments.关键词
薄壳山核桃/生长季修剪/碳氮代谢物/环割/摘心Key words
Carya illinoensis/pruning in growing season/carbon-nitrogen metabolite/ringing/cutting off the growing-tips分类
农业科技引用本文复制引用
冯刚,裴文,吴亚云,曲开军,李小飞,彭方仁..环割和摘心对薄壳山核桃枝条生长和叶片碳氮代谢物积累的影响[J].南京林业大学学报（自然科学版）,2017,41(6):8-12,5.基金项目
江苏省林业三新工程项目(Lysx2016[44]) （Lysx2016[44]）
国家林业局"948"项目(2015-4-16) （2015-4-16）
江苏高校优势学科建设工程资助项目(PAPD) （PAPD）
