前言国营海口林场自五十年代初期以来,为迅速绿化本地的荒山荒地,本着适地适树的原则,选择了云南松作为这地区的主要造林树种,营造了大面积云南松与华山松纯林。四年前,还是一片郁郁葱葱,生长良好,它在国民经济建设及环境保护中正发挥其效益。 Introduction Since the early 1950s, state-owned Haikou Forest Farm has chosen the Pinus yunnanensis as the main afforestation tree species in this area for the purpose of rapidly afforestation of the local barren hills and wastelands and the principle of suitable tree planting, thus creating a large area of ​​Pinus yunnanensis and Huashan pine forest. Four years ago, it was still lush and well-to-do. It is exerting its effectiveness in the national economic construction and environmental protection.