When slopeland is improved into terraced field, the plantable area is reduced because of the surface of farmland becoming flat and the land used for constructing earth banks.
坡地修成梯田后，因种植田面由坡变平和地埂占地，使种植面积减少；
2
In southern China, 37% of land degradation caused by deforestation, 35% by slopeland reclamation, 18% by improper afforestation, and 10% by industrial, mining and transportation construction.