论文部分内容阅读
黄河从青海的龙羊峡进入黄土高原,婉蜒迂回流长达2991公里,至河南桃花峪进入下游平原地区,总面积59.8万平方公里,资源丰富,农业生产潜力很大。但是由于长期以来不合理地利用土地,滥垦滥伐,破坏了地面植被,水土流失十分严重,流失面积达43万多平方公里,平均每年输入黄河的泥沙达16亿吨。土、肥、水的流失,使当地耕地瘠薄,粮食产量低而不稳,“三料” 俱缺,群众生活困难;泥沙淤积,使黄河下游河床逐年抬高,汛期洪水直接威胁着两岸广大平原25万平方公里、一亿多人民生命财产的安全。因此,搞好黄土高原的综
The Yellow River enters the Loess Plateau from Longyangxia in Qinghai Province, with a meandering reach of 2991 kilometers and reaching the lower reaches of the plains in Henan Huayuyu with a total area of 598,000 square kilometers. It is rich in resources and has great potential for agricultural production. However, due to unreasonable use of land for a long time, indiscriminate deforestation and damage to the ground vegetation, soil erosion is very serious, loss of more than 430,000 square kilometers, the average annual import of sediment into the Yellow River amounted to 1.6 billion tons. The loss of soil, fertilizer and water makes the arable land in the area infertile. The output of grain is low and unstable. The “three materials” are deficient and people’s living conditions are difficult. Sedimentation causes the riverbed in the lower reaches of the Yellow River to rise year by year. Floods in the flood season directly threaten the vast Plain 250,000 square kilometers, more than 100 million people’s lives and property safety. Therefore, do a good job of the Loess Plateau