ALFISOLS AND CLOSELY RELATED SOILS IN CHINA  

作　　者：Xiao Duning 肖笃宁(Institute of Applied Ecology,Chinese Academy of Sciences,Shenyang 110015,PRC)

机构地区：[1]Institute of Applied Ecology,Chinese Academy of Sciences,Shenyang 110015,PRC

出　　处：《Chinese Geographical Science》1992年第1期19-30,共12页中国地理科学(英文版)

摘　　要：Alfisols are important soils in China.They occupy about 1.25 million km^(2),or about 13%of the land area.In the current Chinese system of soil classification,burozem,yellow-brown earths,Baijiang(Planosol)soils and parts of drab soils.They are mostly forested soils with an estimated 5-13 t/ha·yr of organic matter returned to the soils from temperate mixed conifer and broad-leaved forest.In terms of elemental bio-cycling,Ca is prominent.In a comparison of 30 profiles the average ratio of clay(B/A)was 1.47 for Cryoboralfs and Eutroboralfs;1.88 for Hapludaifs and 2.53 for Paleudalfs.From Eutroboralfs to Paleudalfs the average gain(or loss)in clay during soil development is about a factor of seven.The moisture regimes vary considerably between Hapludaifs,Cryoboralfs,and associated Cryaquepts,but the amount of water is always enough to cause significant leaching.In the weathering,and pedogenesis processes TiO_(2),MgO and Fe_(2)O_(3) are accumulated,respectively,in both A and BA horizons;but SiO_(2) and Al_(2)O_(3) tend to be leached from the solum.

关 键 词：ALFISOLS DISTRIBUTION CLASSIFICATION 

分 类 号：P[天文地球]