农田防护林更新树种选择及配置模式研究

对农田防护林更新树种和配置模式进行了分析研究。从新品种的引种上筛选出适于河西走廊发展的农田防护林树种为三倍体毛白杨B10 0 8和BT85 ,并能在瘠薄和盐碱化土壤上良好生长 ;经抗寒性分析得出垂柳、云杉、白榆、柽柳、沙枣抗冻性较强 ;为减缓天牛等蛀干害虫危害 ,在林网配置模式上引入了云杉、侧柏、樟子松、垂柳、小叶白蜡、国槐等耐瘠薄抗寒性强的树种 ,营造多树种林带 ,组成混交林网结构 ,使林网中感虫杨树的比例占 2 0 %左右 ,增加了林网结构的稳定性和长效性

STUDY ON SPECIES SELECTION AND ALLOCATION IN REGENERATION OF FARMLAND SHELTERBELT

In this paper were studied tree species and allocation model in regeneration of farmland shelterbelt.From introduced new varieties were screened B1008 and BT85(triploid Chinese white poplar) as farmland shelterbelt species fitting to grow on hungry and alkali soil of Hexi Passageway.Cold resistance Species selected are weeping willow,spruce,white elm,Chinese tamarisk and desert date.In allocation of shelterbelt nets were used Picea koraiensis,Biota orientalis,Pinus sylvestris var.mongolica,Salix babylonica,Fraxinus bungeana and Sophora japonica,and planted multi-species'and mixed shdterbelt nets,in which poplar is 20% or so.