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中国沙漠 ›› 2023, Vol. 43 ›› Issue (1): 176-186.DOI: 10.7522/j.issn.1000-694X.2022.00118

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毛乌素沙地东南缘L3S3 黄土-古土壤色度特征及古气候意义

杨宇哲1(), 岳大鹏1(), 赵景波1,2(), 刘怡婷1, 李嘉宁1, 杨天宇1   

  1. 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
  • 收稿日期:2022-08-04 修回日期:2022-09-23 出版日期:2023-01-20 发布日期:2023-01-17
  • 通讯作者: 岳大鹏,赵景波
  • 作者简介:赵景波(E-mail: zhaojb@snnu.edu.cn
    岳大鹏(E-mail: yuedp@snnu.edu.cn
    杨宇哲(1998—),男,辽宁沈阳人,硕士研究生,主要从事干旱区环境演变研究。E-mail: yangyuzhe@snnu.edu.cn
  • 基金资助:
    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)

Chroma characteristics and its paleoclimatic significance of L3 and S3 loess-paleosol in the southeast margin of Mu Us Sandy Land

Yuzhe Yang1(), Dapeng Yue1(), Jingbo Zhao1,2(), Yiting Liu1, Jianing Li1, Tianyu Yang1   

  1. 1.School of Geography and Tourism,Shaanxi Normal University,Xi'an 710119,China
    2.State Key Laboratory of Loess and Quaternary Geology,Institute of Earth Environment,Chinese Academy of Sciences,Xi'an 710061,China
  • Received:2022-08-04 Revised:2022-09-23 Online:2023-01-20 Published:2023-01-17
  • Contact: Dapeng Yue,Jingbo Zhao

摘要:

通过对毛乌素沙地东南缘的榆林横山柳树峁剖面L3、S3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(TFe2O3)含量的对比研究,以期揭示毛乌素沙地东南缘地区L3、S3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TFe2O3含量密切相关。(3)柳树峁剖面L3-S3层段色度参数指标记录了L3黄土堆积时期存在一个极冷期、两个较冷期和一个暖期,S3古土壤发育时期存在两个暖期和一个冷期。

关键词: 色度, 黄土-古土壤, 气候变化, 毛乌素沙地

Abstract:

By analyzing the chromaticity parameters of 229 samples sampled at equal intervals from the L3 and S3 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 (TFe2O3), a comparative analysis was carried out in order to reveal the chroma characteristics of L3 and S3 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 (L3F, S3F), the peaks of redness a*, yellowness b* and saturation C* appeared in the paleosol layer (S3-1, S3-2), and the chromaticity parameters of the loess layer (L3-1, L3-2) 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 L3-S3 layers in Liushumao section recorded that there was an extremely cold period, two colder periods and a warm period in L3 loess accumulation period, and there were two warm periods and a cold period in S3 paleosol development period.

Key words: chroma, loess-paleosol, climatic change, Mu Us Sandy Land

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