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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(PDF)

《南京林业大学学报(自然科学版)》[ISSN:1000-2006/CN:32-1161/S]

Issue:
2017年06期
Page:
8-12
Column:
专题报道
publishdate:
2017-11-30

Article Info:/Info

Title:
Effects of ringing and cutting off growing-tip on shoot growth and carbon-nitrogen metabolite accumulation in leaves of pecan
Article ID:
1000-2006(2017)06-0008-05
Author(s):
FENG Gang1 PEI Wen2 WU Yayun2 QU Kaijun2 LI Xiaofei1 PENG Fangren1*
1.Co-Innovation Center for the Sustainable Forestry in Southern China, College of Forestry, Nanjing Forestry University, Nanjing 210037, China; 2.Jurong Agriculture Committee, Jurong 212400, China
Keywords:
Keywords:Carya illinoensis pruning in growing season carbon-nitrogen metabolite ringing cutting off the growing-tips
Classification number :
S664; Q945.12
DOI:
10.3969/j.issn.1000-2006.201703025
Document Code:
A
Abstract:
【Objective】The present study investigated reasonable and efficient pruning methods in pecan(Carya illinoinensis), 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 treatments. 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 increased, 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 inhibited 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.

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