引用本文:翁昊璐, 慈恩, 连茂山, 陈林, 胡瑾.重庆市酸性紫色土成因及其对发生分类的意义[J].西南大学学报(自然科学版),2019,41(9):32~39
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重庆市酸性紫色土成因及其对发生分类的意义
翁昊璐, 慈恩, 连茂山, 陈林, 胡瑾
西南大学 资源环境学院, 重庆 400715
摘要:
以采自重庆市的16个酸性紫色土剖面为研究对象,分析海拔、母岩(质)、机械组成、交换性盐基和人为活动等对土壤酸度的影响,探讨重庆市酸性紫色土的成因及其对发生分类的意义.结果表明,在重庆市内,海拔是影响土壤酸度最重要的因素,海拔达到一定高度后(>500 m),土壤质地才会影响盐基淋溶,进而影响土壤酸度;母岩(质)的CEC、有机碳和CaCO3含量对其发育土壤的酸度有影响;ΔpH为供试剖面B层土壤与其母岩(质)之间的pH差值,母岩(质)的CEC、有机碳和CaCO3含量与ΔpH呈对数负相关(其中CEC和CaCO3p<0.05,有机碳分析无统计学意义);在不同盐基离子中,Ca2+对土壤pH值的影响最大,Mg2+和K+对土壤酸度影响的强度与母岩类型有关,Na+则基本无影响;而人为活动对土壤酸度的影响主要体现在耕层土壤的酸度变化上.此外,调查发现,在江津区,有不少pH值呈酸性的沙溪庙组(J2s)紫色岩出露,由于其发育的紫色土在目前的发生分类体系中缺乏相应的土属位置,故建议扩大酸紫泥土的检索范围或在酸性紫色土亚类下为此类土壤新增一个土属,以完善紫色土发生分类体系.
关键词:  重庆  酸性紫色土  母质  海拔  发生分类
DOI:10.13718/j.cnki.xdzk.2019.09.005
分类号:S155.2+5
基金项目:国家科技基础性工作专项项目(2014FY110200);中央高校基本科研业务费专项项目(XDJK2017B027).
The Origin of Acidic Purple Soil in Chongqing and Its Significance for Soil Genetic Classification
WENG Hao-lu, CI En, LIAN Mao-shan, CHEN Lin, HU Jin
School of Resources and Environmental Sciences, Southwest University, Chongqing 400715, China
Abstract:
Sixteen acidic purple soil profiles were collected from Chongqing to analyze the influences of elevation, parent material, mechanical composition, exchangeable bases and human activity on soil acidity and to study the natural origin of acidic purple in Chongqing and its ascription in Chinese Soil Genetic Classification (CSGC). The results were as follows. Elevation is the most important factor influencing soil acidity in the territory of Chongqing. All the tested soils located at 500 m or more above sea level are acidic. Besides, only when the elevation reaches a certain height (500 m) can soil texture influence leaching of exchangeable bases, which, in turn, will influence soil acidity. CEC (cation exchange capacity), SOC (soil organic carbon) and the content of CaCO3 of the parent material influence the acidity of the tested soils. ΔpH, which means the difference of pH between the B layer and the parent material to express the change of pH in the process of soil development, is in negative logarithm correlations with CEC (p<0.05), SOC (p>0.05) and content of CaCO3 (p<0.05). Of the different base ions, Ca2+ has the greatest influence on soil acidity, the influence of Mg2+ and K+ on the acidity of the soil is associated with the type of the parent material, and Na+ has practically no influence on soil acidity. The influence of human activities on soil acidity is reflected mainly in the change in the acidity of the topsoil. Furthermore, this investigation found a large number of exposed acidic purple rocks developed from J2s in Jiangjin district. In current CSGC, the purple soils originating from them do not have a position of their own. Therefore, the authors propose that the search scope for acidic purple soil be increased or a new soil genus for them be added under the acidic purple soil, so as to improve the current occurrence-classification system of purple soil in CSGC.
Key words:  Chongqing  acidic purple soil  parent material  elevation  genetic classification
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