现代土壤磁化率空间分布特征及成壤影响因素分析——以桑干河阳原段为例  

The spatial variability of modern topic magnetic susceptibility and its pedogenesis influencing factors study based on Sanggan River in Yangyuan County, Hebei

作　　者：焦天 董进[1] 汤文坤 迟振卿[1] 王永[1] 庞健锋 孙楠 JIAO Tian;DONG Jin;TANG Wenkun;CHI Zhenqing;WANG Yong;PANG Jianfeng;SUN Nan(Institute of Geology,Chinese Academy of Geological Sciences,Beijing,100037;Institute of Geomechanics,China Academy of Geological Science,Beijing,100081;Beijing East Allreach Certification Center Corporation,Ltd.,Beijing,101102)

机构地区：[1]中国地质科学院地质研究所,北京100037 [2]中国地质科学院地质力学研究所,北京100081 [3]北京东方纵横产品检测有限公司,北京101102

出　　处：《地质论评》2020年第1期229-245,共17页Geological Review

基　　金：国家自然科学基金资助项目(编号:41372172);中国地质调查局地质大调查项目(编号:DD2019060、DD2016012);中国地质科学院地质研究所基本科研业务费项目(编号:J1603)的成果~~

摘　　要：为了揭示影响成壤作用发生的主要因素,对河北省阳原县桑干河流域表层土壤开展常规土壤指标和环境磁学参数的地统计学分析,结果表明,土壤的频率磁化率(χfd20)、Eh值、有机质、黏土-粉砂含量等参数的空间分布特征受控于研究区的高程,而土壤的含水量、铁游离度和活化度的空间分布特征受控于坡向。因此,在影响成壤作用的五大因素(母质、气候、地形、有机质、时间)中,地形(高程、坡向)是影响研究区成壤作用强弱的主要因素。此外,虽然前人发现频率磁化率和铁游离度都能反映铁氧化物含量和成壤作用强弱,但本次研究通过对比空间分布特征发现,频率磁化率与有机质、Eh值等土壤指标有较好的相似性,且与耕地类型分布一致,所以,相对于铁游离度,频率磁化率更能反映研究区土壤发育状况。Objectives: Although previous researchers were devoted to analyze the characteristics and mechanism of soil magnetism,mostly soil vertical profiles,very little work about lateral profiles have been employed. So we attempt to understand spatial distribution of different soil magnetic parameters and reveal the major influencing factors of soil pedogenesis.Methods: The paper primarily takes advantage of geo-statistical methods to analyze spatial variability of conventional soil indexesand environmental magnetic parameters of topsoil in the Sanggan River Basin in Yangyuan County,Hebei Province. Besides,some basic approaches,such as descriptive and correlation analysis et al.,can help us to comprehend the process of soil forming.Results: The results of correlation coefficient for magnetic parameters show that total magnetic contents are mainly affected by superparamagnetic particles. The semi-variogram suggests human activities,for instance,apply fertilizer,cropping system et al.,almost have no influence on magnetic susceptibility( χlf),frequency-dependent magnetic susceptibility( χfd) and the percentage of frequency-dependent magnetic susceptibility( χfp). Above all,the spatial distribution patterns show that soil frequency-dependent magnetic susceptibility( χfd),Eh,organic matter,clay-silt content,heavy metals et al. are controlled by elevation,while the moisture,free iron oxide and active iron are limited by aspect,speculating that elevation affect soil development by hydrodynamic change,and the aspect change moisture by winter monsoon,so we can conclude that topography (elevation,aspect) is the most important factor for soil pedogenesisamongfive soil influencing factors( parent rock,climate,topography,organic matter,time). Besides,in former study,the frequency-dependent magnetic susceptibility and free iron oxide can reflect the content of iron oxide/hydroxides and soil pedogenesis,but in this study,the spatial characteristics of frequency-dependent magnetic susceptibility appear to be more similar to organic

关 键 词：频率磁化率 成壤作用 KRIGING插值 空间变异性 影响因素 

分 类 号：S153.2[农业科学—土壤学]