辽西不同区域人工整枝对樟子松中幼龄林生长的影响

Effects of Artificial Pruning on Growth of Middle-Aged Forest of Pinus sylvestris var.mongolicain Different Regions of Western Liaoning Province

通过在辽宁省西部章古台地区与黑水地区的樟子松中幼龄林中开展不同方式人工整枝试验,结果表明：2/3、1/2两种强度能促进中幼林的胸径生长,这种影响可以达到2～3 a。在章古台地区,人工整枝对樟子松的树高生长影响不显著；但在黑水地区,2/3、1/2两种强度的人工整枝能促进樟子松中幼林树高生长。1/3强度的人工整枝会抑制胸径与树高的生长。在辽西的沙区和山地丘陵区的樟子松人工林的培育中,人工整枝强度以冠高比为1/2～2/3最佳,生产中可以采用。

Artificial pruning experiments of middle-aged forest of Pinus sylvestris var.mongolica were conducted in Zhanggutai Region and the Heishui areas in western Liaoning Province.Result shows that two kinds of pruning in-tensities （2/3,1/2 ）can promote the growth of DBH,this effect can lasts 2-3 years;in Zhanggutai area,artificial pruning has little significance on height growth of Pinus sylvestris var.mongolica;in Heishui area,two kinds of pruning intensities （2/3,1/2 ）can promote height growth of middle-aged forest of Pinus sylvestris var.mongoli-ca .Artificial pruning at 1/3 of the crown length inhibits DBH and tree height of tree.Therefore,in the cultivation of Pinus sylvestris plantations in western Liaoning sand areas and hilly areas,the optimal artificial pruning intensity crown height ratio is 1/2-2/3,which should be adopted in the production.