Choosing 4 excellent varieties of salix integra , the afforestation comparison test of different varieties and different density was carried out by using complete randomized block and split plot design . The yield difference was compared among different varieties and different density .

选择4个杞柳优良品种，采用完全随机区组和裂区试验设计，进行多点不同品种、不同密度的造林对比试验，对其密度和品种间产量差异进行对比分析。