Identifying Categories in Chinese Soil Taxonomy for Typical Rice Field Soils in Liaoning Province

WANG Tian-hao;HAN Chun-lan;WANG Qiu-bing;College of Land and Environment,Shenyang Agricultural University;

Rice field soil;;Stagnic Anthrosols;;Anthrostagnic evidence;;Paddy soil;;Chinese Soil Taxonomy;;Genetic Soil Classification

In order to determine categories in Ch inese Soil Taxonomy(CST) for paddy soil in Liaoning Province,7 typical profiles of paddy soil were investigated in this study.On the basis of investigation and description of soil-forming environment morphological characteristics,and soil,physical and chemical characteristics,the diagnostic horizons and diagnostic characteristics of the soils and the classes in CST were determined following the Keys to Chinese Soil Taxonomy(3 rd edition).Results showed that 4 soils among 7 typical profiles of paddy soils tested had Anthrostagnic epipedon and Hydragric horizon and can be divided into Anthrosols.Another 3 soils only showed Anthrostagnic evidence and Hydragric evidence,and can be classified into Cambosols.This meaned that not all of the rice field soils can be classified into Stagnic Anthrosols(Paddy soil) according to Genetic Soil Classification.The three profiles with Anthrostagnic evidenc belonged to Bori-Udic Cambosols and Haplic-Udic Cambosolse.However,the current version of CST lacked the subgroup with Anthrostagnic evidence of these groups.So we suggest to add subgroups with Anthrostagnic evidence in the two groups of CST.