欢迎您！东篱公司
退出
-
申报数据库
-
立项数据库
-
成果数据库
-
项目获奖数据库
中文摘要：
【目的】通过对关中地区塿土剖面的多角度剖析，试图阐明此类土塿诊断层的形成过程及意义。【方法】根据野外考察和室内试验资料，对土塿剖面从诊断层划分、微形态特征、剖面构造空间变异、成土年龄等方面进行了综合分析和对比。【结果】Bt层形成于8500～3100aB．P．，Bc层在3100～2000aB．P．，Ap层在2000～0aB．P．；Bc层在理化性质、结构构造、微形态等方面与马兰黄土十分相似，而与ApN和Bt层有显著的差异，Ap层与马兰黄土的相似性系数R：在0．8105～0．8951，Bt层的R，为0．6718，而Bc层的Rt在0．9051～0．9352。【结论】壤土具有Ap1-Ap2-Bc—Bt—Bk—C剖面构造，复合剖面的形成主要是由于环境变化引起成土强度发生变化的结果；Ap层是2000a以来人类施加土粪、农业耕作和粉尘堆积同时作用的综合产物，其特征主要受到人类活动强度和方式的控制，Bc层是3100～2000aB．P．期间风尘自然堆积的产物，成土强度较弱；Bt是全新世大暖期的自然产物。
英文摘要：
[Objective] Through extensive analomical analysis of Loutu soil profile in Guanzhong Areas, this paper tries to illustrate the forming process of diagnostic horizon and its significance. [Method] According to data from field investigations and experimentations in laboratory, the Loutu soil profile was anatomized at diagnostic horizon dividing, micromorphological features soil profile pattern difference and soil age. [Result] Bt horizon was formed from 8 500 to 3 100 a B.P., Bc horizon from 3 100 to 2 000 a B.P., and Ap horizon has formed since 2 000 a B.P. Bc horizon very resemble the Malan Loess in physical and chemical characters, structure and micromorphological features, but it has distinct difference with Ap horizon and Bt horizon. Comparability coefficient, between different horizons and Malan loess, is 0.8105-0.8951 in Ap horizon, 0.9051-0.9352 in Bc horizon and, 0.6718 in Bt horizon, respectively. [Conclusion] All the results in this study suggest that Loutu soils have Ap1-Ap2-Bc-Bt-Bk-C profile pattern, which is caused by change of the soil forming intensity that is caused by environmental change. Ap horizon has formed since 2000 years, which infliction loessal dung and eolian dust deposition and cultivation occur simultaneously in the process of Ap horizon-formation, which is mainly controlled by the degree and manner of human activities. Bc horizon is aeolian sedimentary deposit in relative aridity period during 3 100-2 000 a B.P., with weak degree of soil forming. Bt horizon is formed during the Holocene Megathermal.
同期刊论文项目
同项目期刊论文
期刊信息
位置：