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黄河流域九有(区)总面积75.24万km~2,水土流失面积43.9万km~2,占流域总面积的59％。1949～1987年三十八年来,黄河流域八省(区)(不包括四川)水土保持开展面积16.7万km~2(合2.5亿亩),保存面积12.3万km~2(合1.84亿亩)占水土流失面积的28％。其中:梯田、条田(埝地)、坝地、林草等七项措施保存面积共11.7万km~2(合1.76亿亩)。上述七项措施,三十八年累计蓄水效益259.7亿m(?),保土70.2亿t,累计增产粮食329.1亿kg,以及枝条等实物,五项产品按当时或1980年不变价格计,增产总效益分别为195.07和172.68亿元。完成上述七项水保措施总投劳40.8亿工日61.96亿元,其中国家补助投资10.82亿元,占总投资的17.5(?),群众自筹(含劳力折资)51.15亿元,占总投资的82.5(?)。完成上述七项措施的运行费63.96亿元1987年实施水保措施,按1980年不变价格,计算2000年益本比为1.88。黄河流域的水土保持不仅促进了流域各省(区)的农林(?)土生产,还减少了人黄泥沙,三十八年平均每年拦泥1.85亿t,占黄河多年平均输沙量16亿t的11.5％。其中1950～1969年平均每年拦泥0.7亿t,1970～1987年平均每年拦泥2.12亿t,1970年后的18年平均比前20年平均多拦泥2.1亿t,占黄河多年平均输沙量的15(?)关于黄河流域水土保持拦泥土效益的计算,本刊将于下期发表。
Jiuyou (area) of the Yellow River Basin has a total area of 752,400 km2, with an area of 439,000 km2, accounting for 59% of the total basin area. From 1949 to 1987, the area of soil and water conservation in the eight provinces (districts) (excluding Sichuan) of the Yellow River Basin reached 167,000 km 2 (2.5 billion mu) and the preserved area was 123,000 km 2 (184 million mu) Accounting for 28% of the area of soil erosion. Among them: seven fields such as terraced fields, field fields (fields), dam areas, forest and grass conserve an area of 117,000 km 2 (176 million mu total). The above seven measures have accumulated 25.97 billion m (?) Of water storage benefits over the past 38 years, 7.02 billion t of soil protection, a total of 32.91 billion kg of grain increased, and branches and other in-kind products. The total output of the five products at current or 1980 constant prices , Total production increase efficiency 195.07 and 172.68 billion yuan respectively. The total labor input for completing the above seven water conservation measures was 4.08 billion yuan, including 1.982 billion yuan for national grants, 17.5% for the total investment, and 5.115 billion yuan for self-raising by the masses Investment 82.5 (?). The operating cost of completing the above seven measures was 6,396 million yuan. In 1987, the measures for water and soil conservation were implemented. Based on the 1980 constant price, the cost-benefit ratio for 2000 was calculated to be 1.88. Soil and water conservation in the Yellow River Basin has not only promoted the production of agro-forestry (?) Soil in various provinces (regions) in the basin, but also reduced the sediment concentration of human beings. In the last 38 years, it discarded 185 million t of mud per year on average, 11.5% of t. Among them, 1950 to 1969 an average of 70 million tons of mud per year, from 1970 to 1987, an average of 212 million tons of mud per year, 18 years after 1970, an average of more than the previous 20 years more than 210 million tons of mud, accounting for the Yellow River’s average annual sediment transport Quantity of 15 (?) Calculation of soil and water conservation in the Yellow River Drifting soil calculations, this issue will be published next issue.