近年来，党和国家先后作出建设秀美山川、禁伐天然林、实施西部大开发等一系列重大决策，把林业和生态环境建设作为中华民族生存与发展的基础来抓。去年植树节的主题是“封山绿化，退耕还林”，这一主题不仅明确地提出了加强和改善生态环境的政策措施，成为西部大开发重要思路 In recent years, the party and the state have made a series of major decisions in building the beautiful mountains and rivers, forbidding the natural forests and implementing the large-scale development of the western region. They have taken forestry and ecological environment construction as the basis for the survival and development of the Chinese nation. The theme of Arbor Day last year was “closing hillsides and returning farmland to forests”. This theme not only clearly sets out the policy measures for strengthening and improving the ecological environment, but also serves as an important thinking for the development of the western region