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题名	紫色土系统分类的边界指标研究
作者	易开华
学位类别	硕士
答辩日期	1990
授予单位	中国科学院研究生院
授予地点	北京
导师	唐时嘉
关键词	紫色岩 紫色土 系统分类 边界指标
学位专业	土壤学
中文摘要	本文针对紫色土与紫色岩发育的铁硅铝土、铁铝土边界模糊不清的情况，建立了一整套由紫色岩开始、到紫色土野外鉴别、室内分析研究鉴定的程序步骤和数量标准。用大量剖面土壤分析数据对此进行了检验与确定。提出了紫色土亚类、土属、土种划分标准和土类、亚类、土属的检索，土种的举例。进行了新的土壤命名。
英文摘要	The purple soils classification has been studied for a longtime. Under suitable condition purple rock can formate ferric-siallitic soil or ferric soil. All classification didn't settle the question which the difference between the purple soil and the ferric=siallitic soil. In this article, study the purple soil taxonomic classification. 1. The purple soils derived from purple rocks. The purple rocks are sedimentary rocks which light reddish brown (5YR 6/3), reddish brown (5YR 5/4), pale (2.5YR 6/2), strong brown (7.5YR 4/6), yellowish red (5YR 5/8), red (10R 5/8) or between these colour or main one of them. 2. Classify soils in field based on the soil thickness, colour, clay illuviation cutan, when the soil thickness is less than 50cm, it must be purple soil. When more than 10cm horizon is more yellow than 7.5YR in 0-50cm, it must not be purple soil. When it could see clay illuviation cutan in 0-50cm, it must not be purple soil. 3. purple soils main clay minerals are Mont or Illite. The most important diagnostic standard in laboratory are the clay SiO_2/Al_2O_3 > 3.10, SiO_2/R_2O_3 > 2.50. The soil degree of iron freedom < 46.0% in 20-50cn horizon. 4. Purple soils belong to primarosols. It can be classified to four subgroup. Calcareous soil CaCO_3 > 3%. Slight calcareous soil CaCO_3 0.01-3% and PH > 6.5. Slight acid soil CaCO_3 < 0.01% and PH 6.5-5.1. Acid soil PH ≤ 5.0. The soil genus classification based on the clay siallite ratio and soil rock clastic. SiO_2/Al_2O_3 ≥ 3.50, high siliceous. SiO_2/Al_2O_3 3.10-3.49, media siliceous. When ≥2mm clastic ≥35%, rock clastic. 10-34%, much clastic. 5-9% media clastic ≤4%, less clastic. All are 23: soil genus. The soil species classification based on the thickness and texture. When soil thickness <30cm, it is ranker, 30-60cm media soil, >60cm thick soil. 5. Based on site, species, genus, subgroup to name purple soils.
语种	中文
公开日期	2014-02-28
内容类型	学位论文
源URL	[http://ir.imde.ac.cn/handle/131551/6833]
专题	成都山地灾害与环境研究所_成都山地所知识仓储（2009年以前）
推荐引用方式 GB/T 7714	易开华. 紫色土系统分类的边界指标研究[D]. 北京. 中国科学院研究生院. 1990.

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