论文部分内容阅读
陇东黄土高原,地处北纬34°50′—37°10′和东经106°20′—108°40′之间。境内东有子午岭,西有六盘山,辖庆阳、平凉两区大部分县(市),总面积3.45万平方公里。现有人口286.39万,耕地102万公顷。年平均气温7—10℃,≥10℃积温3,000℃左右,年降水量500—600毫米。流域地质
Longdong Loess Plateau, is located between latitude 34 ° 50’-37 ° 10 ’and longitude 106 ° 20’-108 ° 40’. In the east there is Ziwu Mountain and Liupanshan Mountain in the west, with most counties (cities) under Qingyang and Pingliang districts covering a total area of 34,500 square kilometers. The existing population of 2.8639 million, 1.02 million hectares of arable land. The annual average temperature of 7-10 ℃, ≥ 10 ℃ accumulated temperature of about 3,000 ℃, the annual precipitation 500-600 mm. Basin geology