樟子松人工林不同密度调控对林木生长的影响

Effects of different density regulation on tree growth in Pinus sylvestris var.mongolica plantation

以辽宁省科尔沁沙地樟子松人工林为对象,采取多次下层抚育间伐方式,研究了不同间伐密度对樟子松人工林生长状况的影响。结果表明,对于成熟林,从蓄积角度,间伐密度不宜小于500株·hm-2;从胸径生长角度,最小密度不宜小于300株·hm-2。从整体蓄积量、立木蓄积量、单株生长趋势、大径材培养4个方面综合分析,密度为500株·hm-2的小区表现最好。密度过大的小区尽管整体蓄积量大于密度小的小区,但单株材积生长量低,树木生长势较弱,不利于培养大径材。

Multiple thinnings were conducted in the lower story of Pinus sylvestris var.mongolica plantation and the effects of different thinning densities on the plantation growth were studied in Horqin sandy area of Liaoning province.The result indicated that:in mature forests,for the purpose of stock volume accumulation,the thinning density should not be less than 500 trees per hectare;for the purpose of DBH growth,the thinning density should not be less than 300 trees per hectare.From the comprehensive analysis of overall stock volume,standing stock volume,growth trend of individual plant and large-diameter timber culture,the plot with a density of 500 trees per hectare had the best performance.Although the overall volume of the plot with bigger density was larger than that of the plot with smaller density,the volume growth of individual tree was lower and the tree growth potential was weaker,which was not suitable for the cultivation of large-diameter timber.