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陕北地处黄河流域的中部,野生山楂资源很丰富,是我国山楂资源的重要种质库。为了摸清这一资源的种,变异类型和数量分布特点,为开发和利用陕北丰富的山楂资源,我们对黄龙、洛川、富县等几个重点分布区作了初步的调查。一、自然条件和生态特点黄龙、洛川、富县等地位于北纬35°30′—36°25′、东经108°30′～110°30′之间,海拔800～1200米的丘陵沟壑区和大山区,森林覆盖率高。年平均气温9.1°c,最热月平均
Located in the middle of the Yellow River valley in northern Shaanxi, wild hawthorn is rich in resources and is an important germplasm bank of hawthorn in China. In order to find out the species, variation types and quantity distribution characteristics of this resource, in order to develop and utilize abundant hawthorn resources in northern Shaanxi, we conducted preliminary investigation on several key distribution areas such as Huanglong, Luochuan and Fuxian. I. Natural conditions and ecological characteristics Huanglong, Luochuan and Fuxian are located in the hilly and gully areas of northern latitude 35 ° 30’-36 ° 25 ’and longitude 108 ° 30’ ~ 110 ° 30 ’with an elevation of 800-1200 meters And large mountains, high forest cover. The annual average temperature of 9.1 ° c, the hottest month average