陕北黄土区全新世气候替代指标意义及其关系  

THE SIGNIFICANCE AND RELATIONSHIP OF MAIN CLIMATIC INDICATORS FOR THE HOLOCENE IN NORTHERN SHAANXI

作　　者：刘刚 刘普灵[1] 张琼[1] 许文年[2] 

机构地区：[1]西北农林科技大学水土保持研究所黄土高原土壤侵蚀与旱地农业国家重点实验室,杨凌712100 [2]三峡大学三峡库区地质灾害教育部重点实验室,宜昌443002

出　　处：《海洋地质与第四纪地质》2013年第6期139-146,共8页Marine Geology & Quaternary Geology

基　　金：国家自然科学基金项目(41201270);湖北省自然科学基金项目(2012FFB03801)

摘　　要：古气候替代指标在某种程度上包含了温度、降水、季风等气候信息，但每种指标对不同气候信息的表达程度并不相同，并且各种气候替代指标之间的关系以及它们的环境指示意义仍存在一些不确定性。通过对陕北黄土地区全新世土壤剖面进行研究，分析全新世气候替代指标演化规律，运用R／S分析法探讨各气候替代指标之间的关系及其意义。结果表明，磁化率（x11）可以反映暖湿或冷干气候；碳酸钙含量（CaCO3）则主要受到降雨的影响；总有机碳含量（TOC）与温度变化密切相关；全铁含量（TFe）和酸碱度（pH）同时受到温度和降雨量的影响；0．01～0．05mm粗粉粒含量和〈0．005mm的黏粒可以作为冬季风的替代指标。The paleoclimatic indicators certainly contain some climate information, such as temperature, precipitation, monsoon, and so on. However, each indicator expresses the climate information to different degrees. The environmental significance and relationship of climatic indicators need further investigation. In this regard, three Holocene soil profiles in Northern Shaanxi are studied for the change in paleoclimatic indicators. The R/S analysis method was used in this study for the purpose. The results indicate that the magnetic susceptibility of soil （Xlf）＇ total content of furrum （TFe）, and pH can reflect the change in both temperature and rainfall during the soil formation, whereas the content of calcium carbonate （CaCO3） and the total organic carbon （TOC） are mainly influenced by rainfall and temperature, respectively. The parti cle size composition （clay fraction d0. 005 mm and coarse silt 0.01-0.05 mm） can be used to describe the change of East Asian winter monsoon. This study has provided a theoretical basis and scientific reference for the research on Holocene evolution of paleoclimate.

关 键 词：黑垆土 气候 “^14 R S分析 全新世 陕北 

分 类 号：P532[天文地球—古生物学与地层学]