China is a densely populationed and fairly limited farmland which is unevenly distributed. Owing to irrational utilization, land desertification, the less of water and soil erosion, land salinization, and land mining derelicition have been inflicting great havoc in some areas of China. At present,the derelict land by miners has been up to 0.2 million ha.In order to prevent land destruction and conserve farmland, the measures should be taken are to construct wind-proof and sand-fixed forest belts in the Nort...