Study On The Classification Of Aridosols And Halosols In Xinjiang

Soil Taxonomy is one of the basic researches of soil and the foundation of soil science.The establishment of a soil classification system is,to a certain extent,significant for soil classification.As a medium for domestic and international soil academic exchanges,how to establish a soil classification system that is in line with international standards and meets its own characteristics is crucial for future domestic and international exchanges and the development of China's own soil classification.The idea of Aridosols in the existing Chinese soil taxonomy(CST)originates from Aridosols in the Soil Taxonomy(ST).At the same time,according to the special needs of China,the salt soil and the alkaline soil in the World reference bsae for soil resources(WRB)were used to draw out the Halosols.However,by adopting two different classification systems at the same time,the definition of Aridosols includes some Halosols,which leads to the expansion of the area of Aridosols and reduction the amount of Halosols.Based on the above background,this paper aims at the differences in the classification of Aridosols and Halosols in three soil classification systems: the the World Reference Bsae for soil resources(WRB),the Soil Taxonomy(ST),and the Chinese soil taxonomy(CST).Taking Xinjiang Uygur Autonomous Region as a research area and Aridosols and Halosols as research objects,17 soil profiles were collected in this study,including 3 existing profiles and 14 Aridosols and Halosols profiles that have appeared in existing studies.Based on the diagnostic layers and diagnostic characteristics of Chinese soil taxonomy,this paper studies the classification and attribution of each section,and finds the problems existing in the “Chinese soil taxonomy(Third Edition)”.At the same time,reasonable suggestions were proposed for the Aridosols and Halosols in Chinese soil taxonomy,and 17 profiles were reclassified to discuss the similarities and differences between the two classification results before and after the revision.The specific findings are as follows:(1)In the Soil Taxonomy(ST),both saline soil and some alkaline soils are classified into Aridosols and do not appear at the soil order.However,in order to emphasize the change of soil traits and the great harm to agricultural production,China has separately formulated the Halosols at the soil order of the soil system classification.With the reference of the saline soil and alkaline soil in the WRB.However,by adopting two different classification systems at the same time,Halosols will be classified into Aridosols,resulting in the decrease in the amount of Halosols.(2)This paper proposed some specific proposals for the Aridosols and Halosols of Chinese soil taxonomy.Firstly,Halosols was placed in front of the Aridosols.At the same time,the depth of Salic horizon in Halosols,the definition of Sali-Orthic Aridosols and Aridi-Orthic Halosols,and judgment conditions for Aridic epipedon and Aridosols order have all been revised.Finally,a new Subgroup of “Salipan Aridi-Orthic Halosols” was added.(3)According to the proposed scheme,all the nine soils that originally belonged to Sali-Orthic Aridosols were all classified into Halosols,which increased the amount of Halosols and reflected the soil-forming process of salinization.This classification result is consistent with the characteristics of Sali-Orthic Aridosols and Aridi-Orthic Halosols in practical research,and provides a theoretical basis for agricultural production and soil improvement.