今年北京完成的100万亩中幼林抚育工程主要分布在大中型水库上游集水区、水土流失易发区和生态脆弱地区,起着涵养水源、净化水质、防风固沙、保持水土的作用。据了解,这项工程已列入绿化林业十大重点工程,也是市政府2003年为市民办60件实事之一。此项工程由北京市林业勘察设计 This year, the 1 million mu middle-aged and young forested tending activities completed in Beijing are mainly distributed in the upstream catchment areas, vulnerable areas for water and soil loss and ecologically fragile areas, which play a role in water conservation, water purification, windbreak and sand fixation, and soil and water conservation. It is understood that the project has been included in the top ten greening forestry projects, but also municipal government in 2003 for the public to do one of the 60 real thing. This project by the Beijing Forestry Investigation and Design