前言宁夏引黄灌区,由于地下水位高引起的土壤盐渍化,不仅是限制农作物高产的一个重要因素,也是实现农田林网化的一个严重障碍。在盐渍化地区开展四旁绿化,营造农田防护林,一般树种造林成活率低,枯梢严重,生长衰弱,难于成林。1974年以来,为了选择适宜的造林树种,我们从当地生长的旱柳(Salix matsudana Koidz.)着手,进行了单株选优工作。 Introduction Ningxia Yellow River Irrigation District, due to groundwater level caused by soil salinization, is not only an important factor limiting the high yield of crops, but also a serious obstacle to the realization of farmland network. In the salinization area to carry out greening on all sides, to create farmland shelterbelts, the general afforestation survival rate of trees is low, severe dry, weak growth, difficult to forest. Since 1974, in order to select the appropriate tree species, we started from the locally grown Salix matsudana Koidz.