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密云县的退耕还林工程是京津风沙源治理工程的重要组成部分,分布在密云水库周围地区、国道、国铁干线公路两侧,以及生态脆弱地区。主要造林模式为生态型经济林造林模式、经济林模式、农业生态旅游模式、速生丰产林模式与水源保护林模式(荒山造林模式)。对退耕还林工程的生态效益进行了调查与深入的分析,结果表明:密云县退耕还林工程在净化空气、减少风沙危害、保持水土等各方面效益显著。
The Project of Returning Farmland to Forest in Miyun County is an important part of the sandstorm source management project in Beijing and Tianjin. It is distributed around the Miyun Reservoir, on both sides of the national highway and the National Railroad trunk line, and ecologically fragile areas. The main afforestation models are eco-economic afforestation afforestation model, economic afforestation model, agro-ecological tourism model, fast-growing and high-yielding afforestation model and water conservation forest model (barren mountain afforestation model). The ecological benefits of the project of returning farmland to forest were investigated and analyzed in depth. The results showed that the project of returning farmland to forestry in Miyun County had significant benefits in various aspects such as purifying air, reducing the risk of sandstorm and maintaining soil and water.