一、前言柳树(Salix matsudana,Koidz.)为我国北部黄河流域的重要造林树种之一,因为它耐水耐旱,成林迅速,能够提早发挥防护作用,所以我国的西北、豫东防砂林,及永定河下游防护林,都把它选为主要的造林树种。随着我国河渠系统的不断扩大及固砂造林的继续开展,每年必须有巨量的柳类苗木供应,才能满足造林的需要。事实上近年各地防砂造林方面,都常自数十里乃至百里以外,采购柳树的枝条,此不但花费了巨额的采 Foreword Willix (Salix matsudana, Koidz.) Is one of the important afforestation species in the Yellow River basin in the north of our country. Because of its water and drought tolerance, rapid forest growth and early protection, Lower Yongding River shelterbelt, have chosen it as the main afforestation species. With the continuous expansion of the canal system in our country and the continued afforestation with sand, there must be a huge supply of willow seedlings every year to meet the needs of afforestation. In fact, in recent years, various sand control and afforestation areas have often purchased branches of willow trees from tens of miles away and even beyond Barry, which not only cost huge amount of mining