论文部分内容阅读
松辽流域是我国重要的商品粮基地,但由于东北黑土区垦殖指数很高、自然因素制约和长期以来不合理的土地利用,黑土区水土流失呈日益加剧的趋势。据测算,黑土区土壤有机质每年以1‰的速度递减,黑土层以每年0.3~1cm的速度流失。严重的黑土流失导致耕地面积减少,土地生产力下降,已威胁到国家的粮食安全。为了保护珍贵的黑土资源,改善生态和生产生活条件,在实施国家水
Songliao River Basin is an important commodity grain base in China. However, due to the high reclamation index in the black soil area of northeast China, the restriction of natural factors and the irrational use of land for a long time, the soil and water loss in the black soil area is an increasing trend. It is estimated that the soil organic matter in black soil area decreases annually by 1 ‰, and the black soil layer is lost at the rate of 0.3-1 cm per year. Serious black soil loss led to a decrease in arable land, land productivity decline, has threatened the country’s food security. In order to protect the precious black soil resources, improve ecology and production and living conditions, the implementation of national water