为加速绿化黄土高原,尽快改变当地自然面貌和农业生产条件,自1975年开始,我们在延安地区宜川县设立试验基点,就该地区适宜飞播树种的选择,适宜播期、播量的确定,以及提高飞播造林效果的措施等,进行了四年人工地面试验和三年飞播试验,取得初步的效果。现将试验结果报告于后。 In order to speed up the greening of the Loess Plateau and to change the local natural landscape and agricultural production conditions as soon as possible, we have set up a trial base in Yichuan County, Yan’an since 1975, and have decided on suitable seeding species and sowing dates for this area. As well as measures to improve the effectiveness of aerial seeding and afforestation. Four years of artificial ground tests and three years of aerial seeding tests were conducted, with initial results achieved. The test results are reported later.