论文部分内容阅读
我省东部农业区地处黄土高原西缘,是黄土高原向青藏高原的过渡地带,有土地面积5256万亩,占全省总土地面积的4.85%。其中浅山区而积2300万亩,占农业区面积的44%,主要分布在黄河,湟水河谷两岸的黄土丘陵地带,海拔2200—2700米,有深厚的第四纪黄土层复盖,部分地区有第三纪红色粘土层和沙砾层裸露,年均温2—5℃,最热月15℃左右,降水200—400毫米,作物生长期150—200天,具有发展农牧业生产的自然条件。但是广大浅山区的自然植被稀少,土壤裸露,沟壑纵横,
The agricultural area in the eastern part of our province is located on the western edge of the Loess Plateau. It is a transition zone between the Loess Plateau and the Qinghai-Tibet Plateau. It has a land area of 52.56 million mu, accounting for 4.85% of the total land area of the province. Among them, the shallow mountainous area accumulates 23 million mu, accounting for 44% of the agricultural area, mainly distributed in the loess hilly areas on both banks of the Yellow River and the Huangshui River valley, with an elevation of 2200-2700 meters and a deep Quaternary loess layer covering. In some areas Tertiary red clay layer and gravel layer exposed, with an average annual temperature of 2-5 ℃, the hottest month about 15 ℃, precipitation 200-400 mm, crop growth period of 150-200 days, with the development of agricultural and livestock production of natural conditions . However, the vast majority of shallow natural vegetation in shallow mountains, bare soil, ravines aspect,