燕山北部山地干旱阳坡不同造林树种生长状况的比较

为了了解燕山山地干旱阳坡人工造林树种生长状况的差异,对人工栽植的油松、樟子松及蒙古栎的生长状况及其幼林的空间分布格局进行了研究,结果表明:栽植5a后,油松、樟子松和蒙古栎的存活率分别达到了93.79%、87.98%和66.69%,其地径分别为4.68cm、5.34cm、1.52cm,树高分别为1.58m、1.75m、0.80m,油松、樟子松、蒙古栎的单株生物量分别为1 857.36g、2 018.30g、234.35g,形成的人工幼林的密度在867.00~2 183.00株/hm~2之间;立地条件较好的样地幼林的空间分布格局为均匀型,立地条件较差的样地空间分布格局为聚集型。油松、樟子松、蒙古栎均为燕山北部山地干旱阳坡的适宜造林树种,栽植5a后已基本形成稳定的乔木层,人工造林加速了干旱阳坡由绣线菊灌丛向乔木林的更新与恢复。

Comparison on the growth of different tree species in drought sunny slope of the northern region of Yanshan mountains

In order to understand the growth differences of afforestation species in drought sunny slope of Yanshan mountains,this paper studied the growth and spatial distribution pattern of artificial planted forests of Pinus tabulaeformis,Pinus sylvestris var.mongolica and Quercus mongolica.The results showed that:5 years after planting,the survival rates of Pinus tabulaeformis,Pinus sylvestris var.mongolica and Quercus mongolica reached 93.79％,87.98％ and 66.69％ respectively;the ground diameters of Pinus tabulaeformis,Pinus sylvestris var.mongolica and Quercus mongolica were 4.68 cm,5.34 cm,and 1.52 cm,and the tree heights were 1.58 m,1.75 m,and 0.80 m.The individual biomass of Pinus tabulaeformis,Pinus sylvestris var.mongolica and Quercus mongolica were 1 857.36g,2 018.30 g,and 234.35 g respectively.The density of artificial planted sapling forest was between the 867.00 and 2 183.00 strains per hectare.The spatial distribution patterns of sapling forest in site with good condition were all the uniform type,and the patterns in site of poor condition were all aggregated type.The study results showed that Pinus tabulaeformis,Pinus sylvestris var.mongolica and Quercus mongolica were suitable planting species in drought sunny slope of northern region of Yanshan mountian.After 5 years of planting,these tree species have formed a stable tree layer.In drought sunny slope,the artificial afforestation accelerated the recovery of vegetation from spiraea shrub to arborescent forest.