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榆林县位于陕西省北部,地处毛乌素沙地与黄土高原过渡地带。该县属寒温带半干旱季风区,系内陆干草原自然地理带。全县地形北高南低,海拔高度870—1,405米,土地总面积68.35万公顷,按地貌特征分为三大类型区:西北部风沙滩地区、东南部黄土丘陵沟壑区和中南部盖沙黄土河谷川道区。各类型区自然条件的差异,对农林牧生产及飞播牧草的成效有显著的影响。我们从1980年以来,针对各地类特点进行了不同的地面处理试验,观察记载了各地貌区内各土地类型的飞播牧草的效果,并对调查资料进行统计、分析,为进一步提高飞播牧草的成效提供科学依据。
Yulin County is located in northern Shaanxi Province, is located in the Mu Us sand and the Loess Plateau transition zone. The county is a temperate semi-arid monsoon zone, Department of inland steppe natural geography. The terrain of the county is high in the north and low in the north, with an elevation of 870-1,405 meters above sea level. The total area of the land is 683,500 hectares. There are three types of landforms according to the landform: the wind and sand beach area in the northwest, the loess hill and gully area in the southeast, River valley area. The differences in natural conditions of all types of zones have a significant impact on the success of agriculture, forestry, animal husbandry and aerial seeding. Since 1980, we have carried out different ground treatment tests on the characteristics of different places and observed and recorded the effects of airborne forages of various land types in each landscape area. We also conducted statistical analysis on the survey data to further improve the effectiveness of the airborne forage grass Provide a scientific basis.