论文部分内容阅读
通过对乐都水文站径流量、输沙量、降水量进行分析,探讨了青海省湟水流域退耕还林还草的效益:2000—2010年,青海省湟水流域各县(市)累计完成退耕还林还草面积14.71万hm2,2002年退耕还林还草效益开始显现,年径流量和年降水量开始增加,年输沙量和年输沙模数明显减少,退耕后的年输沙量和年输沙模数分别比退耕前减少了467万t和359 t/km2。鉴于青海省湟水流域退耕还林还草工程区生态环境总体上还比较脆弱,提出了延长退耕还林还草补助政策的时间、加大基本口粮田建设力度、调整产业结构、提高全社会的生态意识等建议。
By analyzing the runoff, sediment load and precipitation in Ledu Hydrological Station, the benefits of returning farmland to forest and grassland in Huangshui River Basin in Qinghai Province were discussed: from 2000 to 2010, all counties (cities) in Huangshui River Basin in Qinghai Province were completed The area of returning farmland to forestry and grassland reached 147.1 thousand hm2. In 2002, there was a noticeable increase in the annual income of urban and rural areas, and the annual runoff and annual precipitation began to increase. The annual sediment transport and annual sediment transport decreased significantly. And the annual sediment transport modulus decreased by 4.67 million t and 359 t / km2, respectively, compared with those before the project. In view of the fact that the ecological environment of the project of returning farmland to forestland to forestry and grassland in Huangshui River Basin in Qinghai Province is still fragile as a whole, put forwards the time to extend the policy of returning farmland to forestland and grassland, intensify the construction of basic grain rations, adjust the industrial structure and improve the whole society Eco-awareness and other suggestions.