坡向及林窗大小对油松人工林天然更新幼苗数量及生长的影响

Effects of Aspect and Gap Size on Numbers and Growth of Natural Regeneration Seedlings in Pinus tabulaeformis Plantation

通过选择设置不同坡向、林窗大小的林分,比较了各类型油松人工林内天然更新的1~8年生幼苗数量、树高、基径、生物量等变化,结果表明:不同坡向、林窗大小下幼苗生长情况存在差异,林下生长4年以及4年以上的苗木缺乏,小林窗中生长8年的大规格苗木缺乏,大林窗中的苗木结构相对较为合理,但是6~7年生苗木的数量较少;大林窗有利于苗木树高、基径生长以及生物量积累,阴坡林分更新苗木状况好于阳坡林分。

Through setting different slope directions and gap sizes,the changes of tree height,basal diameter and biomass of natural regeneration seedlings of 1-8-year-old Pinus tabulaeformis plantation were compared.Result shows that:There are differences in seedling growth under different slope directions and forest window sizes.There is a shortage of seedlings growing for four years or more in understory treatment,a shortage of large-sized seedlings growing for 8 years in small forest window,and the seedling structure in large gap is relatively reasonable,but the number of seedlings growing for 6-7 years is relatively small.The effect of big gap is better than that of small forest window and understory in promoting height,basal diameter and biomass of seedlings,and the shade slope is optimal than that of sunny slope.