Plantation of Pinus tabulaeformis for soil protection in a dry low mountainous region. - - Afforestation, Forestry Research & Development in Three-North Regions: GCP/CPR/009/BEL. Since 1978 China has been implementing a massive rehabilitation programme aimed at afforestation of more than 35 million h a. over a 73-year period in the arid and sub-arid belt of Northwest, North and Northeast China, the so-called Three-North Region. T