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甘肃北山地区位于甘肃省西北隅,是指疏勒河隐伏断裂以北,黑河以西至甘、新两省(区)交界处的广大地带,面积约六万多平方公里,属戈壁丘陵地貌区。据有关气象资料,本区属温带干旱气候区,夏季酷热,冬季寒冷;本区日照时间长,降水量少,蒸发量大,年平均降水量58.3毫米,而蒸发量达2600余毫米;每年11月至翌年5月为风季,以西南风为主,冰冻期自9月至翌年4月,最大冻土深度为176毫米。该区基岩裸露好,植被稀少,无常年地表迳流。因此本区岩石风化作用以物理风化为主,化学
Located in the northwestern corner of Gansu Province, the Beishan area of Gansu refers to the vast area north of the Shulehe Concealed Fault, the west of the Heihe River to the Gan and the new provinces (districts). It covers an area of over 60,000 square kilometers and belongs to the Gobi Hilly Landform Area. According to relevant meteorological data, this area belongs to a temperate arid climate zone, with hot summers and cold winters. The region has a long period of sunshine with less precipitation and large amount of evaporation with an average annual rainfall of 58.3 millimeters and an evaporation of 2,600 millimeters annually. The month from May to the following year is the windy season with the southwest wind prevailing. The freezing period is from September to April the following year. The maximum frozen soil depth is 176mm. The bedrock exposed in this area is good, vegetation is scarce, impermanence year surface bleed. Therefore, the weathering of rock in this area is mainly physical and chemical