一、特性滇杨分布在我国东北、华北、西北及长江流域地区。垂直分布于海拔1000—3100米之间,以海拔2000米左右地区生长最好。一般多为人工栽植于“四旁及箐沟两侧。滇杨是喜温凉气候的阳性树种,不耐庇荫,在年平均气温8—18℃,年降雨量为600—1300毫米,相对湿度70%左右能正常生 First, the characteristics of Yunnan Yang distribution in northeast China, North China, Northwest and the Yangtze River Basin. Vertical distribution in the 1000-3100 meters above sea level, to about 2000 meters above sea level the best growth. Mostly artificial planting in the "four sides and the ditch ditch on both sides .Yang Yang is a positive warm climate species, impatience shade, the annual average temperature of 8-18 ℃, annual rainfall of 600-1300 mm, relative humidity 70 About normal students can be%