近几年来，北京市大兴区林业局结合农业结构调整，先后在青云店、长子营、榆垡、礼贤等镇，依托绿色通道、治沙片林等造林重点工程，发展速生丰产林２万亩。实践证明，营造速生丰产林是大兴区林业种植结构调整的一项重要内容和发展方向。速生丰产林的效益对比不同种植模式的林? In recent years, Daxing District, Beijing Forestry Bureau combined with the adjustment of agricultural structure, successively in the Albatron shop, the eldest son camp, Elm, Lixian town, relying on the green channel, sand control forest and other key afforestation projects, the development of fast growing forest 20,000 mu. Practice has proved that to create fast-growing and high-yielding forest planting industry in Daxing District, an important part of the content and development direction. The benefits of fast-growing high-yield forest contrasting different planting modes of forest?