Micromorphological Features of Diagnostic Horizons in Several soils in Southwest China: Implication for Soil Taxonomic Classification

作     者：XU Xiangming HE Yurong HUANG Chengmin XIONG Donghong XU Xiangming1,2, HE Yurong1*, HUANG Chengmin3, XIONG Donghong11 Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China 2 Graduate University of the Chinese Academy of Sciences, Beijing 100049, China 3 Department of Environmental Science and Engineering, Sichuan University, Chengdu 610065, China

作者机构：Institute of Mountain Hazards and Environment Chinese Academy of Sciences Chengdu 610041 China Graduate University of the Chinese Academy of Sciences Beijing 100049 China Department of Environmental Science and Engineering Sichuan University Chengdu 610065 China 

出 版 物：《Journal of Mountain Science》 (山地科学学报（英文）)

年 卷 期：2010年第7卷第1期

页      面：73-82页

核心收录：

学科分类：0710[理学-生物学] 071001[理学-植物学] 07[理学] 09[农学] 0903[农学-农业资源与环境] 090301[农学-土壤学] 

基　　金：supported by the Knowledge Innovation Program of the Chinese Academy of Sciences (Grant No. KZCX2-YW-409) 

主　　题：Soil micromorphology Soil diagnostic horizon Chinese Soil Taxonomy Southwestern China 

摘      要：The comparative studies on micromorphological features in diagnostic horizons of Stagnic Anthrosols, Ustic Ferrosols and Ustic Vertosols in southwestern China were conducted to underpin the rationale for Chinese Soil Taxonomy. The following findings were explored: (1) Stagnic Anthrosols had the specific micromorphological features, e.g., the humic formation in anthrostagnic epipedon, the platy structures in plow subhorizon, the secondary formation of ferromanganese and the weakly optical-orientation clay domains in hydragric horizon, etc.: (2) The groundmasses of ferric horizon in Ustic Ferrosols appeared in hue of 2.5YR or redder, and had pellicular grain structure; (3) Ustic Vertosols had a crust horizon (Acr), and crack structure dominated in Acr and angular blocky structure in disturbed horizon; (4) Because of the distinct differences in micromorphological features among these three soils, the specific micromorphological features might be employed as diagnostic horizons to differentiate soils while the quantifiable micromorphological features might potentially be selected as diagnostic indices for Chinese soil taxonomic classification.