章古台地区不同密度樟子松人工林衰退情况分析

Degeneration of Pinus sylvestris var. mongolica Plantations at Different Densities in Zhanggutai Area

针对科尔沁沙地东南缘章古台地区的樟子松引种固沙林出现大面积衰退,甚至死亡现象,在该地区樟子松林中选择不同密度的样地进行调查分析。结果表明:樟子松的衰退与林分密度呈正相关;林木的胸径随林分密度的增加而减小,林木的枯死株数、枯梢病感病指数随密度的增加而增加。综合来看,章古台地区樟子松初植密度应控制在1700株hm^-2以下,并应根据生长情况对林木进行疏伐作业,在近熟龄之前将林分密度降至700株hm^-2左右比较适宜。

In view of the large-scale decline and even death of Pinus sylvestris var. mongolica in the Zhanggutai Area on the southeastern margin of Horqin Sandy Land, different density plots were selected for investigation in Pinus sylvestris var. Mongolica .Result shows that the degeneration of Pinus sylvestris var. mongolica is positively correlated with the stand density;the DBH of the forest decrease with the increase of stand density, and the number of dead plants and the disease index of the dieback increase with the increase of density. Taken together, the initial planting density of Pinus sylvestris var. mongolica in the Zhanggutai Area should be controlled below 1 700 treeshm^-2 , and the tree should be thinned according to the growth conditions, and the tree density should be reduced to 700hm^-2 is more suitabl ebefore the age of maturity.