湘江衡阳段网纹红土磁化率分布特征及其意义  

Magnetic Susceptibility Distribution Characteristics of Reticular Red Soil in Hengyang Section of Xiangjiang River and its Significance

作　　者：韦美 熊平生[1] 潘俊杰 刘亮 何兴楠 WEI Mei;XIONG Pingsheng;PAN Junjie;LIU Liang;HE Xingnan(College of Geography and Tourism,Hengyang Normal University,Hengyang,Hunan 421002)

机构地区：[1]衡阳师范学院地理与旅游学院,湖南衡阳421002

出　　处：《绵阳师范学院学报》2024年第5期114-120,共7页Journal of Mianyang Teachers＇ College

基　　金：湖南省自然科学基金项目(2021JJ30063)。

摘　　要：为了探究湘江衡阳段网纹红土磁化率分布的特征及其对环境气候的指示意义,对采集的南郊89件、松涛90件样品进行了磁化率测量及分析,结果表明:(1)与黄土相比,衡阳盆地网纹红土磁化率值较低,因为在南方高温湿热的环境下,土壤中的强磁性矿物更容易被淋失和转换.(2)两个剖面顶部χfd值均大于10%,土壤中含有较多SP颗粒;松涛剖面网纹红土值部分χfd值小于5%,平均值为6.67%,土壤中可能不含或仅有少量SP颗粒.(3)衡阳盆地底部网纹层磁化率存在明显波动,这反映了衡阳盆地网纹红土成土时期气候冷暖交替,两个剖面χ_(lf)、χ_(hf)、χ_(fd)之间存在较强的相关关系,说明χ_(lf)、χ_(hf)、χ_(fd)对环境的指示意义比较一致.In order to investigate the characteristics of the magnetic susceptibility distribution of reticular red soil in the Hengyang section of Xiangjiang River and its indicative significance for environmental climate,89 samples from Nanjiao and 90 samples from Songtao were collected for magnetic susceptibility measurement and analysis.The findings are as below:①In comparison to loess soils,the magnetic susceptibility value of the reticular red soil is lower in Hengyang basins,which can be attributed to the leaching and conversion of strong magnetic minerals in the soil under the hot and humid environment in south China.②Theχ_(fd) values at the top of both bisects are greater than 10%,indicating that more SP particles may contained in the soil;part of theχ_(fd) values of the reticular red soil in the Songtao bisect is less than 5%,with an average value of 6.67%,showing that there are possibly no SP particles or few amount of SP particles.③The lower magnetic susceptibility values in the bottom reticulated layer reflects the climatic characteristics of warmth,wetness and heat indicated by reticulated laterite in Hengyang basins.Furthermore,there are strong correlations founded betweenχ_(lf),χ_(hf) andχ_(fd) in both bisects,which shows that indication ofχ_(lf),χ_(hf) andχ_(fd) are relatively consistent of significance to the environment.

关 键 词：网纹红土 磁化率 分布特征 相关性 

分 类 号：P532[天文地球—古生物学与地层学] S15[天文地球—地质学]