大兴沙地7个杨树品种适应性研究

Adaptability of Seven Poplar Varieties in Daxing Sandy Land

杨树是北京大兴区的主栽树种,自20世纪80年代,陆续引进多个杨树新品种,各品种生长表现差异较大。为筛选出该区适应性强的优良杨树品种,在沙土地上营建了107杨、108杨、中林46杨、中林2025杨、北抗杨1号、沙兰杨和红叶杨等7个品种的对比试验林,并对试验林各品种的保存率、胸径、树高、单株材积等性状进行了连续观测,结果表明:107杨、108杨、中林46杨、北抗杨1号和2025杨保存率高且生长快,适宜在大兴沙地造林中推广应用;沙兰杨材积生长速度略低,可适量栽植;红叶杨保存率不足50%,各生长指标均显著低于其他品种,不适宜在该地造林中应用。

Poplar is the main tree planted in this area.Since the 1980s,a number of new poplar varieties were introduced.By comparison,the growth performance of each variety is quite different.In order to screen out the superior poplar varieties with strong adaptability in this area,a test forest of seven poplar varieties,Populus×euramericana cv.‘Neva’,P.×euramericana cv.‘Guariento’,P.×euramericana cv.‘Zhonglin 46’,P.×deltoides cv.‘Zhonglin 2025’,P.deltoides cv.‘Beikang-1’,P.×canadensis cv.‘Sacrau 79’and P.deltoides cv.‘Zhonghuahongye’,was built in the sandy land of Xiangying Village southeast in Yufa Town in 2008.And the retention rate,diameter at breast high,tree height and volume per plant of each variety of poplar were observed continuously.Result shows that:P.×euramericana cv.‘Neva’,P.×euramericana cv.‘Guariento’,P.×euramericana cv.‘Zhonglin 46’,P.deltoides cv.‘Beikang-1’and P.×deltoides cv.‘Zhonglin 2025’have high preservation rate and fast growth rate,which are suitable for popularizing and applying in afforestation in Daxing sandy land.The volume growth rate of P.×canadensis cv.‘Sacrau 79’is slightly lower and can be planted in a moderate amount;the preservation rate of P.deltoides cv.‘Zhonghuahongye’is less than 50%,and its growth indicators are significantly lower than other varieties,so it is not suitable for application in afforestation in this area.