THE GENETIC PROPERTIES OF SOILS IN ARID TROPICAL AND SUBTROPICAL REGIONS OF CHINA
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Abstract:
This paper deals with the comparative study of the genetic properties of soils in arid tropical and subtropics regions of China.The results showed that,(Ⅰ) as compared with the corresponding soils in humid regions all the soils in arid areas are the same in properties,with weeker eluviation,higher pH and base saturation,a little difference between CEC aed ECEC,a very low amount of variable negative charge,a high ferritization coefficient,low hydration coefficient,and low contents of active Fe and A1 which indicates that the soil developing intensity is low.(2) Owing to the different hydrothermal condition the soils in various arid regions are different in their developing intensity.The developing intensity of the soils in various regions studied is in a desconding sequence of the soil in west Hainan (in ferrallitic stage) >the soil in Yuanjiang Yunnan (weak ferrallitic) the soil in Tianlin,Guangxi (parafereallitic) >the soil in Yuanmou Yunnan (fersiallitio) >the soil in Dukou,Yunnan (scallitic).
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