柳树是山东省平原地区的主要造林树种之一。但是由于经营粗放,致使柳树林分生长差,效益低。为此,我们立题研究柳树丰产栽培技术,以期为柳树人工林的集约经营提供科学依据。现根据5年的试验结果总结如下: 1 试验林地的自然概况 试验地设在潍河沿岸诸城、安邱、昌邑3县市的4个村。年平均气温12℃,极端最低气温-19.5℃,极端最高气温39℃。全 Willow is one of the main afforestation species in the Shandong Plain. However, due to extensive management, resulting in poor growth stand Willow Grove, low efficiency. To this end, we set the theme of high-yield cultivation techniques willow, with a view to the willow plantation to provide a scientific basis for intensive management. Now based on 5 years of test results are summarized as follows: 1 The natural profile of the experimental forest land Experimental sites located in Zhucheng, Anqiu, Changyi 3 counties and cities in the four banks of the Weihe River. The annual average temperature of 12 ℃, the extreme minimum temperature of -19.5 ℃, the extreme maximum temperature of 39 ℃. all