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1984～1987年,我们在榆林地区的佳县、米脂、绥德、定边、靖边、横山、榆林、神木、府谷等9县11个林场9个村,通过踏查访问、选设标准地、实地调查和定点定株的物候观察,对该区的旱柳类型进行了研究,并进行了优良类型的选择。共选设了9块标准地,作了288株标准木。一、调查研究方法类型划分是依据形态变异中较稳定的性状,如:花序的长短、雄蕊枚数、花丝的分裂;小枝颜色、长短,皮孔的多少、大小、形状以及排列方式,枝的开张角度、枝径;椽的长短、通直度、尖削度、光滑程度,6～7年生椽皮的颜色、裂纹、开张形状和角度;叶的大小、形状、薄厚以及叶片正反两面的颜色和有无绒毛等。根据划分类型的依据,对各形态特征进行了对照合并,除去形态特征不十分明显
From 1984 to 1987, we visited 9 farms in 11 forest farms in 9 counties, including Jiaxian, Mizhi, Suide, Dingbian, Jingbian, Yokoyama, Yulin, Shenmu and Fugu in Yulin. Field observation and site-specific observation of phenology were conducted, and the types of willow in this area were studied and the best type of selection was made. Selected a total of nine standard, made 288 standard wood. First, the research methods of classification is based on the morphological variation of the more stable traits, such as: the length of the inflorescence, the number of stamens, filaments of the division; branch color, length, number of skin holes, size, shape and arrangement, Angle, branch diameter; rafter length, straightness, sharp degree, smooth degree, 6 ~ 7 year rafter’s color, crack, opening shape and angle; leaf size, shape, thickness and the color of both sides of the blade And there is no hair and so on. According to the basis of the type of division, the morphological characteristics of the control were combined to remove the morphological characteristics are not very clear