云南省元谋干热河谷的土壤系统分类

SOIL TAXONOMIC CLASSIFICATION IN YUANMOU DRY AND HOT VALLEY,YUNNAN PROVINCE

应用土壤系统分类的原理和方法，研究了元谋干热河谷主要土壤的土壤铁铝特性、弱腐殖质化（层）特性、变性特征、岩性特征等诊断特性。据此提出了当地高级分类单元的土壤系统分类（草案）。分析了主要土壤的剖面特征和理化性状，并对亚类以下分类问题提出了看法。

According to the principles and methods of taxonomic classirication,the soil taxonomic classification had been studied in Yuanmou dry and hot valley,Yunnan Province,with special natural environment and varied soil types.The main diagnostic characteristics or diagnostic horizons in soils were:1.ferrallic property;2.ochrihumic property;3.vertic features;4.lithologic characters.Meanwhile,additional soil features and processes,such as soll moisture and temperature regime;soil erosion process; calcaric property as well as salic evidence,had been arialysed. Moreover,the soil taxonomic classification(draft)in the region was propased,in which 3 orders,4 suborders,4 groupe and 8 subgroups had been divided. The principal diversity in soil features among soil groups was pointed out, based onsoil profile features and soil physical and chemical properdes.The basic catagories of taxonomic classification had been discussed,In particular,meimportance in soil classification of erosive soil features on diagnostic charateristics and indexes ofsubgroups or below and inherited soil features had been suggested.