论文部分内容阅读
黄土高原地区自然条件复杂,各类型区的飞播适期差异很大。因此,正确选择播期,适时播种,是飞播种草造林成败的关键。在西北半干旱半湿润地区(年降水350—500毫米),选择适宜的播期飞播沙打旺已有成功的经验,但在年降水量250毫米的干旱地区如何确定飞播种草造林适宜的播期,尚未有成功的经验。为探索该类地区飞播沙打旺的适期,我们于1981—1983年在宁夏同心县半荒漠地区进行了地面撒播试验和飞播试验。
The natural conditions in the Loess Plateau are complex, and there are great differences in the suitable seasons for the airborne seeding of various types of areas. Therefore, the correct choice of sowing, timely sowing, is the key to success or failure of aerial sowing. In the semi-arid and semi-humid areas of the northwest (350-500 mm of annual precipitation), the successful sowing date of sowing Astragalus adsurgens has been selected, but how to determine the appropriate sowing and planting of afforestation in arid areas with an annual precipitation of 250 mm? Period, there is no successful experience. In order to explore the suitable period of aerial seeding in such areas, we conducted ground-spreading experiments and aerial seeding experiments in the semi-desert area of Tongxin County, Ningxia in 1981-1983.