论文部分内容阅读
汾西县位于山西省中南部,东临汾河,西依吕梁山,属于我国西北黄土高原的一部分,也是黄河中游水土流失重点县之一。全县大部分地区表层复盖着第四纪马兰黄土,其下部为第三纪红色粘土,基岩大部分为奥陶纪石灰岩。地下水位很低,三百余处小泉小水满共有零点二个流量,水源奇缺,十年九旱。六百七十条一公里以上的沟道将地形切割的支离破碎。每年约向黄河输送泥沙四百一十万吨,水土流失严重。农业生产长期落后,粮食产量低而不稳。
Fenxi County is located in the central and southern Shanxi Province, east of the Fen River, Luliang Hill in the west, belonging to the Northwest Loess Plateau of China is also one of the key counties of soil erosion in the middle reaches of the Yellow River. The surface of most parts of the county covers the Quaternary Malan loess, the lower part of the Tertiary red clay, most of the bedrock for the Ordovician limestone. Groundwater level is very low, more than three hundred Koizumi small water full of zero flow, water scarce, ten nine drought. Six hundred and seventy kilometers above the channel cut the terrain fragmented. Each year about 4.11 million tons of sediment is transported to the Yellow River, resulting in serious soil erosion. Long-term backward agricultural production, low and unstable grain output.