Abstract:

It is necessary that primary vegetation situation under certain condition should be made clear for reconstructing degraded ecosystem, otherwise vegetation construction would be of considerable riskiness and blindness. Emphasis forest vegetation in the Loess Plateau was emphatically dealt with.From certain arguments the viewpoints have been discussed such as no forests in the Loess Plateau, secondary grasslands,thick loess,400 mm of precipitation,different interpretations in vegetation demarcation,and climatic change.Thus the reasonableness offor the vegetation zonality principle taking such marks as the demarcation lines on Yan’an and along the Great Wall was shown through exclusion. We believed that zonal environment was possessed in the Loess Plateau.

Key words: primary vegetation, forest, vegetation zonality, Loess Plateau