环剥、环割对薄壳山核桃新梢生长和叶片碳氮代谢物积累影响

为研究环剥和环割这2种修剪措施对薄壳山核桃新梢生长和叶片碳氮代谢物积累的影响,以5年生薄壳山核桃幼树‘波尼’(‘Pawnee’)为试材,对同一规格长度(40~45 cm)新梢进行环剥处理(环剥1 mm、环剥2 mm和环剥3 mm)和环割处理(环割1圈、环割2圈和环割3圈)。不同宽度环剥和不同圈数环割处理对薄壳山核桃的影响不同。环剥和环割处理能抑制新梢伸长生长,促进粗度生长;环剥3 mm处理的叶片可溶性糖含量、淀粉含量、蛋白质含量和C/N比高于其他处理和对照,但与环剥2 mm无显著性差异;环割3圈处理的叶片可溶性糖含量、淀粉含量、蛋白质含量和C/N最高。综合考虑修剪措施可能对树体的影响,环剥2 mm或环割3圈为生产上新梢的适宜修剪方式。

Effects of girdling and ringing on branch growth and accumulation of carbon-nitrogen metabolites in leaves of Carya illinoinensis

To study the effects of the two pruning treatments (girdling and ringing) on the growth of branches and accumulation of carbon-nitrogen metabolites in leaves of Carya illinoinensis,branches from 5-year-old grafted seedling of'Pawnee'pecan were girdled with different widths (1 mm/2 mm/3 mm) and ringed with dif ferent circles (1 circle/2 circles/3 circles).The results showed that girdling and ringing inhabited the shoot elonga tion,but promoted the shoot radial growth.The contents of soluble sugar,starch,protein and the ratio of C/N in the leaf treated with girdling 3 mm were higher than other treatments and the control,but no significant differ ences were found in the treatment of girdling 2 mm.The contents of soluble sugar,starch and protein and the ratio of C/N in the leaf treated with ringing3 circles were the highest.Girdling and ringing might have effects on the trunk growth of Carya illinoinensis.The suitable pruning treatment of Carya illinoinensis is girdling 3 mm or ringing 3 circles.