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我省杨树“小老树”面积280多万亩,这些林分生长很慢,既不能成材,又不能充分发挥森林的防护作用,极待改造。我们利用“小老树”作砧木,嫁接速生杨树品种,改造杨树“小老树”面积800亩,长势普遍良好,嫁接后5年生的群众杨树高7.01米、胸径6.52厘米,是未经改造的12年生“小老树”树高的3倍、胸径的2.5倍。
Poplar “little old tree” in our province covers an area of more than 2.8 million mu. These forests grow slowly so that they can not be turned into materials and can not give full play to the protective role of forests. We use the “small old tree” as a rootstock, grafting poplar varieties of poplar, transformation poplar “little old tree” area of 800 acres, growing generally good, poplar trees after 5 years of grafting 7.01 meters high, diameter of 6.52 cm, is not modified 12-year-old “little old tree” 3 times the tree height, 2.5 times the diameter at breast height.