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箭杆杨是渭北四旁绿化的主要树种之一。据我们调查,用1—2年生苗木冬、春二季造林,成活率差不多,而幼树生长状况差异显著。春季造林,健康幼树株数为95％,冬季造林健康幼树株数为39.0—63.5％,比春季低31.5—56％。但由于农林活路安排及土地倒茬,往往需要在冬季造林。冬季造林要注意以下几点:
Arrow Yang is one of the main trees around the Weibei green. According to our investigation, the survival rate of 1-2 year-old seedlings in winter and spring is almost the same, while the growth of young trees is significantly different. In afforestation in spring, the number of healthy saplings was 95%, the number of healthy saplings in winter afforestation was 39.0-63.5%, which was 31.5-56% lower than that in spring. However, afforestation is often required in winter because of the arrangement of agroforestry and land reclamation. Winter afforestation should pay attention to the following points: