摘要
通过对陕西扶风全新世黄土剖面的土壤学和地层学研究、磁化率、酸碱度和粒度测定分析,揭示了周原地区全新世成壤环境演变过程。黄土剖面中的埋藏古土壤S0形成于全新世大暖期的温湿环境中,古土壤S0中黄土夹层(Lx)的存在,表明6000aBP前后季风气候发生转折,在6000～5000aBP出现一个干旱阶段,并使得全新世大暖期分裂成为两个主要的温湿阶段。大约从3100aBP开始,受全球降温过程的影响,季风气候朝向干旱化方向发展,全新世大暖期的成壤作用被黄土堆积所取代。现代表土大约从1500aBP开始发育。
The integrative pedological and sedimentary study was carried out in a Holocene loess profiles on the Zhouyuan loess tableland in Fufeng County, Shaanxi Province. The field investigation and the measurement of magnetic susceptibility, pH values and grain-size distribution has reveled the variations of the pedological environment during the last {11 500} years. Corresponding to the Holocene climatic optimum ({8 500}～{3 100} a BP), Paleosol S_(0) was developed. The analytical results indicate that this soil is a soil complex. There was an arid phase ({6 000}～{5 000} a BP) represented in the middle of the Holocene climatic optimum, during which a loess bed (L_(x)) was deposited. Therefore, the Holocene palaeosol S_(0) becomes two separated soils (S+1_0 and S+2_0)in this profile. It also shows that the period between {8 500} a BP and {6 000} a BP was the maxmum of the Holocene climatic optimum. From {3 100} a BP when the pre-dynastic Zhou people lived and built their Capital city 'Qiyi' on the Zhouyuan loess tableland, the Holocene climatic optimum was ended and the monsoon climatic became colder-drier. The recent loess (L_(0)) was accumulated. This is a widespread phenomenon over the Loess Plateau. The modern soil (MS) has been developed since about {1 500} a BP due to the disturbance of cultivation, the modern soil has been well developed in this profile.
出处
《中国沙漠》
CSCD
北大核心
2004年第2期149-152,共4页
Journal of Desert Research
基金
教育部重大项目(01JAZJD770014)
国家自然科学基金(40071006)资助
