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河北省怀安县小流域自1983年列入全国水土保持治理重点以来,县委、县政府将治理水土流失政善农业生产条件,作为振兴山区经济、实现脱贫致富的根本措施来抓,已收到了明显效果。截至1988年底止,全县营造水土保持林41.7万亩,种草7万亩,建设基本农田7.2万亩,修筑各项水土保持工程34000多处,综合治理面积达到398.6平方公里,占应治理面积的41.6％。 一生态环境得到了改善。全县造林种草保存面积29.7万亩,人工林草的覆盖率由治理前的6.6％提高到17.6％。有效治理区内每年可拦蓄径流694万立方米,减少洪水流量56.3％;拦截泥沙63.7万吨,年土壤侵蚀模数由3147吨平方公里下降到1137吨/平方公里。由于对水土流失的有效控制,改善了上
Huai’an County, Hebei Province, the small watershed since 1983 included in the focus of soil and water conservation since the county government will be governance of soil and water conservation and good conditions for agricultural production, as the revitalization of mountain economy to achieve the fundamental measures to get rid of poverty and get rich, has received significant results . As of the end of 1988, the county created 417000 acres of water and soil conservation forest, 70000 acres of grass, the construction of 72000 acres of basic farmland, the construction of various soil and water conservation projects more than 34000, comprehensive management area of 398.6 square kilometers, accounting for the area should be governance Of the 41.6%. An ecological environment has been improved. The county afforestation grass conservancy area of 29.7 hectares, artificial forest grass coverage rate from 6.6% before the treatment increased to 17.6%. Effective management of the area each year can save runoff of 6.94 million cubic meters of runoff, reducing floods 56.3%; interception sediment 637,000 tons, the annual soil erosion modulus from 3147 tons square kilometers down to 1137 tons / square kilometers. Due to the effective control of soil and water loss, improved