Eeffects of Two Top Pruning on Growth of Young Mother Trees in Orchard of Pinus sylvestris var. mongolica

doi:10.11923/j.issn.2095-4050.cjas19040017

Abstract

Abstract: Effects of two kinds of top pruning on the growth of young mother trees in orchard of Pinus sylvestris var. mongolica were studied to provide a theoretical management basis. The young mother trees of P. sylvestris var. mongolica in Yulin, Shaanxi Province were selected as the research object, and they were pruned by top 2- wheeled branches (L2) and top 3-wheeled branches (L3). The effects of the two top pruning methods L2 and L3 on 7 growth indices of tree height, ground diameter, crown width, under crown height, clear bole height, annual branch length, biennial branch length, sprout number of young of P. sylvestris var. mongolica were studied. The results showed that both L2 and L3 inhibited the growth of tree height of young trees of P. sylvestris var. mongolica. They obviously promoted the growth of ground diameter and crown width of the young trees of P. sylvestris var. mongolica. The order of annual branch length and biennial branch length of L2, L3 and control group was L3> L2> control group. Top pruning methods L2 had no significant effect on annual branch length and biennial branch length. Top pruning methods L3 had no significant effect on annual branch length but had significant effect on biennial branch length, and could obviously promote the growth of branch length. Both L2 and L3 had no significant effect on biennial branch length and sprout number of young P. sylvestris var. mongolica. In conclusion, the two top pruning methods have different effects on the growth of young mother trees, and L3 is more suitable for the management of young mother trees of P. sylvestris var. mongolica.

CLC Number:

S798.7

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