“七五”期间,山东省的沂源、沂水、平邑三个贫困县被列为国家以工代赈水土保持小流域治理项目县。五年国家共拿出棉花127.5万公斤,纯棉布255万米,实折款1045.48万元,主要用于三县39条小流域的综合治理。这39条小流域位于沂河、沐河水系的上游,总面积737.45平方公里,其中水土流失面积占76.7%。严重的水土流失恶化了生态环境和生产条件,成为其 During the “Seventh Five-Year Plan” period, three poor counties, namely Yiyuan, Yishui and Pingyi in Shandong Province, were listed as counties under the State’s program of “Small Watershed Management for Soil and Water Conservation in Food for Work”. In five years, the country took out 1,275,000 kilograms of cotton and 2.55 million meters of pure cotton cloth, with the actual folded amount of 10,454,800 yuan, which is mainly used for the comprehensive treatment of 39 small watersheds in three counties. The 39 small watersheds are located in the upper reaches of the Yihe and Muhe river systems, with a total area of ​​737.45 square kilometers, of which 76.7% are water and soil loss areas. Serious soil erosion has worsened the ecological environment and production conditions, becoming its