中国沙漠 ›› 2024, Vol. 44 ›› Issue (4): 223-235.DOI: 10.7522/j.issn.1000-694X.2024.00043
张悦仪1(), 迟云平1,2(
), 谢远云1,2, 康春国3, 刘若男1, 孙磊1, 吴鹏1, 魏振宇1
收稿日期:
2024-02-07
修回日期:
2024-04-15
出版日期:
2024-07-20
发布日期:
2024-08-29
通讯作者:
迟云平
作者简介:
迟云平(E-mail: 1982cyp@163.com)基金资助:
Yueyi Zhang1(), Yunping Chi1,2(
), Yuanyun Xie1,2, Chunguo Kang3, Ruonan Liu1, Lei Sun1, Peng Wu1, Zhenyu Wei1
Received:
2024-02-07
Revised:
2024-04-15
Online:
2024-07-20
Published:
2024-08-29
Contact:
Yunping Chi
摘要:
沙漠作为干旱气候的产物,记录着气候与环境变迁的丰富信息,在不同区域条件下沙漠风成沉积物特征指示的气候环境存在差异。本研究在科尔沁沙地自东向西共选取25个样点,进行色度、漫反射光谱和磁化率分析,探讨沙地地表风成沉积物的空间变化特征,并结合区域的现代气候因子探讨各代用指标的气候意义。结果表明:科尔沁沙地地表风成沉积物的色度特征与区域降水关系密切,亮度(L*)、红度(a*)与黄度红度比(b*/a*)能够作为指示区域气候的代用指标;地表沉积物中针铁矿(Gt)和赤铁矿(Hm)的相对含量均处于较低水平,Gt/Hm的变化能够指示气候干湿条件的总体趋向;地表风成沉积物的χfd%值能够作为区域降水情况的代用指标,沉积物的磁性增强主要源于降水强度增加导致的风化成壤作用加强,进而产生大量细颗粒亚铁磁性矿物。总体而言,科尔沁沙地地表风成沉积物色度、磁化率和Gt/Hm能够有效指示区域气候环境。
中图分类号:
张悦仪, 迟云平, 谢远云, 康春国, 刘若男, 孙磊, 吴鹏, 魏振宇. 科尔沁沙地地表沉积物特征及其气候意义[J]. 中国沙漠, 2024, 44(4): 223-235.
Yueyi Zhang, Yunping Chi, Yuanyun Xie, Chunguo Kang, Ruonan Liu, Lei Sun, Peng Wu, Zhenyu Wei. Characteristics and climate significance of surface sediments in the Horqin Sandy Land[J]. Journal of Desert Research, 2024, 44(4): 223-235.
图1 (A)东亚地区DEM图;(B)科尔沁沙地DEM图;(C)年降水量;(D)年平均气温
Fig.1 (A) DEM map of East Asia; (B) Horqin Sandy Land DEM map; (C) Annual precipitation; (D) Annual mean temperature
样品 | 亮度L* | 红度a* | 黄度b* | ||||||
---|---|---|---|---|---|---|---|---|---|
平均值 | 最大值 | 最小值 | 平均值 | 最大值 | 最小值 | 平均值 | 最大值 | 最小值 | |
全样 | 74.01 | 80.37 | 55.19 | 3.18 | 5.30 | 1.93 | 11.02 | 13.00 | 8.36 |
<63 μm | 56.91 | 63.30 | 52.58 | 5.04 | 6.19 | 3.65 | 13.81 | 16.22 | 10.29 |
42°—43°N | 73.91 | 79.38 | 55.20 | 3.24 | 5.30 | 3.24 | 11.20 | 12.44 | 11.20 |
43°—44°N | 74.10 | 80.37 | 56.10 | 3.12 | 4.02 | 3.12 | 10.85 | 13.00 | 10.85 |
119°—121°E | 76.62 | 80.37 | 72.24 | 2.96 | 3.26 | 2.96 | 10.84 | 11.81 | 10.84 |
121°—124°E | 71.60 | 79.38 | 55.20 | 3.38 | 5.30 | 3.38 | 11.19 | 13.00 | 11.19 |
表1 科尔沁沙地风成沉积物颜色参数
Table 1 The color parameters of wind-sand sediments in Horqin Sandy Land
样品 | 亮度L* | 红度a* | 黄度b* | ||||||
---|---|---|---|---|---|---|---|---|---|
平均值 | 最大值 | 最小值 | 平均值 | 最大值 | 最小值 | 平均值 | 最大值 | 最小值 | |
全样 | 74.01 | 80.37 | 55.19 | 3.18 | 5.30 | 1.93 | 11.02 | 13.00 | 8.36 |
<63 μm | 56.91 | 63.30 | 52.58 | 5.04 | 6.19 | 3.65 | 13.81 | 16.22 | 10.29 |
42°—43°N | 73.91 | 79.38 | 55.20 | 3.24 | 5.30 | 3.24 | 11.20 | 12.44 | 11.20 |
43°—44°N | 74.10 | 80.37 | 56.10 | 3.12 | 4.02 | 3.12 | 10.85 | 13.00 | 10.85 |
119°—121°E | 76.62 | 80.37 | 72.24 | 2.96 | 3.26 | 2.96 | 10.84 | 11.81 | 10.84 |
121°—124°E | 71.60 | 79.38 | 55.20 | 3.38 | 5.30 | 3.38 | 11.19 | 13.00 | 11.19 |
图4 科尔沁沙地风成砂样品针铁矿(Gt)和赤铁矿(Hm)一阶导数(IDV)特征峰分布曲线
Fig.4 Characteristic peak distribution curve of first derivative of goethite and hematite in eolian sand samples from Horqin Sandy Land
图6 科尔沁沙地风成砂色度参数与气候因子相关系数注:*,P≤0.05
Fig.6 Indicative diagram of correlation coefficients between chromaticity parameters and climate factors of aeolian sand in Horqin Sandy Land [*P≤0.05]
图9 科尔沁沙地风成砂磁化率参数与气候因子相关系数指示图
Fig.9 Correlation coefficient diagram between magnetic susceptibility parameters and climatic factors of aeolian sand in Horqin Sandy Land
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