退耕还林是国务院批准实施的六大林业重点工程之一,是党中央、国务院作出的重大战略决策,是综合治理水土流失,加强生态环境建设,更好地保护、开发、利用自然资源的治本之策。它关系到西部大开发战略实施的成败,具有十分重要的战略意义。宁南山区是“三西”贫困地区之一。属黄河中上游黄土高原丘陵沟壑区,90%的土地属黄土丘陵沟 Returning farmland to forests is one of the six major forestry projects approved by the State Council. It is a major strategic decision made by the Party Central Committee and the State Council. It is a fundamental solution to comprehensively control soil and water loss, enhance ecological environment and better protect, develop and utilize natural resources Of the policy. It has a bearing on the success or failure of the implementation of the strategy for the grand development of the western region and is of great strategic significance. Ningnan Mountain is one of the “Three West” poor areas. Is the middle and upper reaches of the Yellow River hills and gully areas, 90% of the land is loess hilly