雅安地区位于长江中上游四川盆地向高原过度的地带,在她15450平方公里的地域内,山区占91.7％,气候温和、雨量充沛,历史上曾经是一个森林茂密的地方。但是,多年的采伐和长期对陡坡地的耕作,植被遭到破坏,水土大量流失,生态环境日益恶化。近些年来,一降大雨,林区就有90％的公路遭到毁坏,生态环境的治理已经到了刻不容缓的境地。国家保护天然林和退耕还林的战略 Ya’an region is located in the upper reaches of the Yangtze River in Sichuan Basin to the plateau over the strip in her area of ​​15,450 square kilometers, 91.7% of the mountains, mild climate, abundant rainfall, historically once a densely populated place. However, after many years of harvesting and long-term cultivation of steep slopes, vegetation has been destroyed, soil and water have been largely lost and the ecological environment has deteriorated. In recent years, with heavy rainfall, 90% of the roads in the forest area have been destroyed, and the treatment of the ecological environment has reached an impending pace. National strategy of protecting natural forests and returning farmland to forests