重庆北碚中梁山土壤发育过程中粒度与磁化率关系探讨
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摘要
粒度作为衡量气候变化指标的研究已经取得了巨大的成就,所谓沉积物粒度组成是指不同粒径的颗粒在沉积物中所占的百分比,对于查明沉积物的物质来源、搬运介质和动力、沉积环境以及他们的变化都具有重要意义。它是沉积物最重要的特征之一,在环境分析及重建中具有重要的地位。
直至目前为止,磁化率广泛应用于沉积环境方面以及北方气候变化的代用指标研究中,但是该研究并未在南方地区得到广泛的发展。当前时期全球环境气候变化和区域相应的研究已经成为世界关注的焦点。“现在是认识过去以及预测未来的钥匙”。针对以上的问题本文着力加强对南方地区的粒度与磁化率之间关系的研究与分析,希望经过本文的初步探讨可以为今后相关方面的研究提供基本的参考。
本文研究对象为中梁山三个不同土壤剖面——黄壤、石灰土与紫色土剖面,分别对其进行粒度相关参数与质量磁化率和频率磁化率的测定,对二者之间的关系进行分析探讨,得到以下几点初步认识：
(1)通过粒度实验分析结果显示,三个不同土壤剖面的众数粒级都是粉砂组分百分含量,其次是黏粒组分含量,再次是砂砾组分含量,根据粒度组成三角图图解可知,这三种土都属于粉砂黏土质地；
(2)从总体磁化率较低的三种不同土壤来看,频率磁化率所反映的过渡性稳定单畴与超顺磁颗粒对每个剖面上的磁性贡献不一,且对风化成壤程度具有指示作用,从约翰.迪林的主要磁性矿物的磁畴和来源不同的样品的Xif-Xfd%图可以知道三个土壤都是由本身母质风化形成,并没有远程物质的侵入,而频率磁化率绝对值的大小又进一步证明了三个剖面的发育程度；
(3)三种土壤各粒度参数与频率磁化率、质量磁化率的相关性分析表明：黄壤中频率磁化率、质量磁化率分别与标准差、偏度之间呈现显著的负相关性,相关系数分别是0.7924、0.6512,紫色土中质量磁化率与砂粒级呈现显著正相关性,其相关系数是0.7178且它们之间可以建立起回归方程,设y1,y2分别为频率磁化率、质量磁化率,而x1,x2,x3,x4,x5,X6,x7,x8分别为对应的各参数变量,其回归方程分别为：y1=-0.101x6+2.2483,y2=-0.0467x7+0.3811,y2=0.4761x3-2.1735：
(4)由于上一个结论中的相关性分析,可得知南方地区黄壤的频率磁化率、质量磁化率可以以标准差、偏度作为间接指标反映气候变化,紫色土的质量磁化率可以以砂粒级含量作为间接指标反映气候变化,即当黄壤中频率磁化率、质量磁化率以及紫色土中质量磁化率的值低时,对应着气候干冷的环境,反之亦然。
Granularity has been making a great achivement as an indicator on the research of climate change.Sedimetary grain size is the percentage of different size of particles in sediment.It is useful for us to figure out the Material source,handing media,power and sedimentary environment.lt is one of the most important features of the sediment,and has played a decision role on environment analysis and reconstruction.
So far as we know,magnetic susceptibility has been applying in sediment environment and the climate of Northern China.At preseat,the global environment and climat change has become a relevant focus of world attention.In short,today is the key to understand tne past and pretict the future.As the above proposing questions,the paper try to start make some research about the relationship between the grain size and the magnetic susceptibility on three different soil profiles.
Firstly,The experimental analysis of particle size shows that silt content is the most of the three different soil profiles, the following is clay content,and the last is the sand content.Accroding to the Diagram triamgle of grain size figure,we know that the three of all are clayey silt soil;
Secondly, the number of transitional Stable single domain particles and Super-paramagnetic susceptibility particles which are reflected by Frequency dependent susceptibility is not the same on the three profiles,and it also can indicate the degree of soil weathering,illustrating that the yellow soil is the best,and the purple soil is the worst among the three.Besides,the result proved that John.Dilin's figure about different samples'main domain and the source of magnetic minerals showed they are formed by the weathering of parent material;
Thirdly, correlation analysis showed that there were siginificantly negative relations between Frequency dependent susceptibility,Magnetic susceptibility and Standard deviation, Skewness in yellow soil.There were siginificantly positive relation between magnetic susceptibility and sand content in purple soil;
Last,after the above analysis,we know that Magnetic susceptibility,Frequency development susceptibility in yellow soil,and Magnetic susceptibility in purple siol could measure up the climate changes in Southern China.
直至目前为止,磁化率广泛应用于沉积环境方面以及北方气候变化的代用指标研究中,但是该研究并未在南方地区得到广泛的发展。当前时期全球环境气候变化和区域相应的研究已经成为世界关注的焦点。“现在是认识过去以及预测未来的钥匙”。针对以上的问题本文着力加强对南方地区的粒度与磁化率之间关系的研究与分析,希望经过本文的初步探讨可以为今后相关方面的研究提供基本的参考。
本文研究对象为中梁山三个不同土壤剖面——黄壤、石灰土与紫色土剖面,分别对其进行粒度相关参数与质量磁化率和频率磁化率的测定,对二者之间的关系进行分析探讨,得到以下几点初步认识：
(1)通过粒度实验分析结果显示,三个不同土壤剖面的众数粒级都是粉砂组分百分含量,其次是黏粒组分含量,再次是砂砾组分含量,根据粒度组成三角图图解可知,这三种土都属于粉砂黏土质地；
(2)从总体磁化率较低的三种不同土壤来看,频率磁化率所反映的过渡性稳定单畴与超顺磁颗粒对每个剖面上的磁性贡献不一,且对风化成壤程度具有指示作用,从约翰.迪林的主要磁性矿物的磁畴和来源不同的样品的Xif-Xfd%图可以知道三个土壤都是由本身母质风化形成,并没有远程物质的侵入,而频率磁化率绝对值的大小又进一步证明了三个剖面的发育程度；
(3)三种土壤各粒度参数与频率磁化率、质量磁化率的相关性分析表明：黄壤中频率磁化率、质量磁化率分别与标准差、偏度之间呈现显著的负相关性,相关系数分别是0.7924、0.6512,紫色土中质量磁化率与砂粒级呈现显著正相关性,其相关系数是0.7178且它们之间可以建立起回归方程,设y1,y2分别为频率磁化率、质量磁化率,而x1,x2,x3,x4,x5,X6,x7,x8分别为对应的各参数变量,其回归方程分别为：y1=-0.101x6+2.2483,y2=-0.0467x7+0.3811,y2=0.4761x3-2.1735：
(4)由于上一个结论中的相关性分析,可得知南方地区黄壤的频率磁化率、质量磁化率可以以标准差、偏度作为间接指标反映气候变化,紫色土的质量磁化率可以以砂粒级含量作为间接指标反映气候变化,即当黄壤中频率磁化率、质量磁化率以及紫色土中质量磁化率的值低时,对应着气候干冷的环境,反之亦然。
Granularity has been making a great achivement as an indicator on the research of climate change.Sedimetary grain size is the percentage of different size of particles in sediment.It is useful for us to figure out the Material source,handing media,power and sedimentary environment.lt is one of the most important features of the sediment,and has played a decision role on environment analysis and reconstruction.
So far as we know,magnetic susceptibility has been applying in sediment environment and the climate of Northern China.At preseat,the global environment and climat change has become a relevant focus of world attention.In short,today is the key to understand tne past and pretict the future.As the above proposing questions,the paper try to start make some research about the relationship between the grain size and the magnetic susceptibility on three different soil profiles.
Firstly,The experimental analysis of particle size shows that silt content is the most of the three different soil profiles, the following is clay content,and the last is the sand content.Accroding to the Diagram triamgle of grain size figure,we know that the three of all are clayey silt soil;
Secondly, the number of transitional Stable single domain particles and Super-paramagnetic susceptibility particles which are reflected by Frequency dependent susceptibility is not the same on the three profiles,and it also can indicate the degree of soil weathering,illustrating that the yellow soil is the best,and the purple soil is the worst among the three.Besides,the result proved that John.Dilin's figure about different samples'main domain and the source of magnetic minerals showed they are formed by the weathering of parent material;
Thirdly, correlation analysis showed that there were siginificantly negative relations between Frequency dependent susceptibility,Magnetic susceptibility and Standard deviation, Skewness in yellow soil.There were siginificantly positive relation between magnetic susceptibility and sand content in purple soil;
Last,after the above analysis,we know that Magnetic susceptibility,Frequency development susceptibility in yellow soil,and Magnetic susceptibility in purple siol could measure up the climate changes in Southern China.
引文
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[2]Verosub K L,Roberts A P.Environmental magnetism:Past,present,and future.Journal of Geophysical Research,1995,100(B2):2175-2192.
[3]刘强,魏海泉,许建东等.吉林龙岩四海火山碎屑物粒度分析与地质意义[J].地震地质,2009,31(1)：112-121
[4]毛龙江,李亚兵,王计平等.南京江北地区全新世土壤粒度分布及其古环境意义[J].海洋地质与第四纪地质,2005,25(2)：127-132
[5]胡思辉,袁胜元,霍炬等.长江中游砂山的粒度特征及古气候环境意义[J].地质科技情报,2006,25(1)：35-40
[6]于雪峰,周卫建,刘小青等.青藏高原东部全新世泥炭灰分的粒度特征及其古气候意义[J].沉积学报,2006,24(6)：864-869
[7]史小丽,秦伯强.近百年来长江中游网湖沉积物粒度特征及其环境意义[J].海洋地质与第四纪地质,2009,29(2)：117-122
[8]田晓四,朱诚,尹茜等.长江三峡库区中坝遗址地层洪水沉积粒度特征及其沉积环境[J].沉积学报,2007,25(2)：261-266
[9]乔彦松,郭正堂,郝青振等.中新世黄土—古土壤序列的粒度特征及其对成因的指示意义[J].中国D辑地球科学,2006,36(7)：646-653
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