在营造林网过程中,不少地区栽植了相当数量的大官杨。该树种,定植4—5年以后,大部分受透翅蛾、天牛危害,受害后枝干伤疤突起,生长势显著衰退,不仅减低对农田的防护效益,而且也很难长成大材。选用大官杨作农田林网,远远不如生长快、材质好、能成大材的毛白杨,但毛白杨有造林后幼树缓苗期长的缺点。为了尽快改造大官杨林网,我们利用采伐后大官杨根桩改接毛白杨,获得了良好的效果。当年接株一般高达4米以上,胸径5厘米左右。改接后3年生毛白杨生长量赶上原来未改接的大官杨。并大大超过用毛白杨幼苗 In the process of building a forest network, many areas have planted a large number of high-ranking officials. The tree species, colonization 4-5 years later, most of the affected by the transparent moth, celastrus damage, after the injury branch of the sudden prominence, the potential decline significantly, not only to reduce the protective benefits of farmland, but also difficult to grow large. Use of high-Yang for farmland forest network, far less than the fast-growing, good material, can become a large material of Populus tomentosa, Populus tomentosa has young plants after the slow seedlings Huanmiao shortcomings. In order to rebuild the official Yang Lin network as soon as possible, we use the logging after the replacement of Poplar Yang root piles, access to good results. Inoculation then generally up to 4 meters above the breast diameter of about 5 cm. Change the 3-year-old poplar growth to catch up with the original officer Yang did not change. And much more than with Populus seedlings