毛乌素沙地东南缘L_(3)、S_(3)黄土-古土壤色度特征及古气候意义  

Chroma characteristics and its paleoclimatic significance of L_(3)and S_(3)loess-paleosol in the southeast margin of Mu Us Sandy Land

作　　者：杨宇哲 岳大鹏 赵景波 刘怡婷[1] 李嘉宁 杨天宇 Yang Yuzhe;Yue Dapeng;Zhao Jingbo;Liu Yiting;Li Jianing;Yang Tianyu(School of Geography and Tourism,Shaanxi Normal University,Xi'an 710119,China;State Key Laboratory of Loess and Quaternary Geology,Institute of Earth Environment,Chinese Academy of Sciences,Xi'an 710061,China)

机构地区：[1]陕西师范大学地理科学与旅游学院,陕西西安710119 [2]中国科学院地球环境研究所黄土与第四纪地质国家重点实验室,陕西西安710061

出　　处：《中国沙漠》2023年第1期176-186,共11页Journal of Desert Research

基　　金：国家自然科学基金重点项目(42130507);中国科学院黄土与第四纪地质国家重点实验室项目(SKLLQG2106,SKLLQG2013)。

摘　　要：通过对毛乌素沙地东南缘的榆林横山柳树峁剖面L_(3)、S_(3)黄土-古土壤地层等间距采集的229个样品进行色度分析,并通过与碳酸钙和全氧化铁(TFe_(2)O_(3))含量的对比研究,以期揭示毛乌素沙地东南缘地区L_(3)、S_(3)黄土-古土壤的色度特征及其与气候变化的关系。结果表明:(1)亮度L*和色调角h*的峰值出现在风沙层(L3F、S3F),红度a*、黄度b*和饱和度C*的峰值出现在古土壤层(S3-1、S3-2),黄土层(L3-1、L3-2)的各色度参数介于风沙层与古土壤层两者之间。(2)亮度L*受红度a*和黄度b*的影响较大,而受碳酸钙含量影响微弱。红度a*和黄度b*表现出一致性变化,具有良好的相关性,且与TFe_(2)O_(3)含量密切相关。(3)柳树峁剖面L_(3)-S_(3)层段色度参数指标记录了L_(3)黄土堆积时期存在一个极冷期、两个较冷期和一个暖期,S_(3)古土壤发育时期存在两个暖期和一个冷期。By analyzing the chromaticity parameters of 229 samples sampled at equal intervals from the L_(3)and S_(3)loess-paleosol strata of the Liushumao section in Hengshan area where in the southeast margin of Mu Us Sandy Land,and combining with the content of calcium carbonate and total iron oxide(TFe_(2)O_(3)),a comparative analysis was carried out in order to reveal the chroma characteristics of L_(3)and S_(3)loess-paleosol and its relationship with climate change.The results showed that:(1)The peaks of brightness L*and hue angle h*appeared in the aeolian sand layer(L_(3)F,S_(3)F),the peaks of redness a*,yellowness b*and saturation C*appeared in the paleosol layer(S_(3)-1,S_(3)-2),and the chromaticity parameters of the loess layer(L_(3)-1,L_(3)-2)were between the aeolian sand layer and the paleosol layer.(2)Brightness L*was greatly affected by redness a*and yellowness b*,but weakly affected by calcium carbonate content.The correlation between redness a*and yellowness b*is well,and showed consistent changes,and they were closely related to the content of total iron oxide.(3)The chromaticity parameters of L_(3)-S_(3)layers in Liushumao section recorded that there was an extremely cold period,two colder periods and a warm period in L_(3)loess accumulation period,and there were two warm periods and a cold period in S_(3)paleosol development period.

关 键 词：色度 黄土-古土壤 气候变化 毛乌素沙地 

分 类 号：P532[天文地球—古生物学与地层学]