内蒙古赤峰市敖汉旗沙地引种樟子松造林研究

AFFORESTATIN IN SANDY LAND BY Pirus Sylvestris var.Mongolica IN AO HANQI, CHIFENG CITY OF THE INNER MONGOLIA

内蒙古赤峰市敖汉旗在 1973年～ 1977年进行了樟子松沙地造林试验 ,截至 1998年 ,2 4年生樟子松林 ,表现基本稳定 ,生长较快 ,年平均树高生长量达 0 .2 2 m～ 0 .38m ,年平均胸径生长量达 0 .34cm～ 0 .5 9cm ,比油松和小叶杨的生长量大 ,在沙丘的中上腹比小钻杨也高。影响樟子松林生长的主要因素是 ,当地的降水量较低 ,在干旱年份出现水分亏缺 ;部分地区的土壤下层有白土间层 ,水分和养分的含量低 ;以及有些林分密度偏大 ,林分出现枯死现象等。

Pinus sylvestris var.mongolica afforestation testing has been carried in Ao Han county of Inner Mongolia from 1973 to 1977,the forest of 24 years has been in steady condition by 1998.Its growth increosing quickly.The average year height,DBH growth increment got to 0.22～0.38m,0.34～0.59cm respectively,Its biomass was bigger than Chinese pine and Xiaoye Poplar,and also exceed Xiaozuan Poplar in the middle of dune.The main factors that influence the growth of Pinus sylvestris var.mongolica are lower precipitation,especially moisture dificit in arid year.some area has whitish soil layer in underlayer which contout low water and nutrient,as well as partially density in some stand that lead to wither etc.