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我县的主要造林树种是杨树,近几年主要用于大面积造林的品种有小黑树、小青黑扬、白城杨—2、双阳快、北京杨等。可是,每年都发现大量新植幼树发生不同程度的枯梢以及全株死亡,一九八○年幼树枯死更为严重。为了探讨幼树枯死的原因,以便采取相应的措施,提高造林成活率和保存率,促进幼树生长,我们于八○年六月至八月到本县卧虎、兴隆、实验三个林场和郑家屯苗圃,以及红旗、卧虎、茂林等七个公社进行了调查,踏查了万亩林地、按不同树种,不同树令、不同立地环境凋查了一百多块标地,实测了一千多株幼树、着重考查了造林树种,
The main afforestation tree species in our county is poplar. In recent years, the main species used in large-scale afforestation are small black trees, small blue black Yang, Baicheng Yang -2, Shuangyang fast, Beijing Yang and so on. However, a large number of new plant-infested trees are found year after year with varying degrees of withered shoots and whole plant deaths. In 1980, the young trees died even worse. In order to explore the causes of dead trees in order to take appropriate measures to improve the survival rate and survival rate of afforestation and promote the growth of saplings, we in June 1980 to August this year, Crouching Tiger, Xinglong, experimental three forest and Zhengtatun nursery, as well as the Red Banner, Crouching Tiger, Maolin and other seven communes were investigated, inspected 10,000 mu of forest land, according to different species, different trees, different site environment witnessed more than 100 plots, measured a Thousands of saplings, focusing on examining afforestation species,