The major division of China is into two regions with marked contrasts in their geographical environment: the Eastern Monsoon Regions and the Central Asiatic Plateaus, the physiographic boundary of which follows approximately the Kbingan Mountains, the In Shan, the Szech-wanese Alps and the edge of Yunnan Plateau.
The rainfall of China is scanty when compared with the northeas ern partof the United States of Ameriea, almost identical in location and in latitude,The aridity of north China was found to be due to the following four causes.
The classification of soils in China is essentially following Marbut's system2.It is first grouped into Pedocals and Pedalfers depending upon their lime content in the soil profiles. Pedocals are predominant in North China where precipitation is not enough to leach out the lime in the soils. While Pedalfers arepredominant in South China where the rainfall is higher.
Following the completion of the New Atlas of China compiled by V. K.Ting, W. H. Wong and S. Y. Tseng, the modeling of a relief map of China hasbeen undertaken by the National Geological Survey of China under the directionof the writer since late winter of 1933.
