摘要
为调查广西马山县岩溶区土壤全硒含量分布特征,探讨不同成土母质、土地利用方式和土壤类型对土壤硒含量的影响,采集马山县北部表层土壤(0~20 cm)样品492个,采用统计学方法对土壤硒含量进行空间分布特征研究。结果表明:土壤硒含量变幅为(0.20~3.54)×10^(-6),平均值为0.76×10^(-6),富硒面积占到98.29%,变异系数为34.49%。研究区含有黑色页岩和煤系地层的二叠系合山组发育的土壤硒含量最高,平均为1.17×10^(-6);石炭系马平组最低,平均为0.64×10^(-6)。赤红壤硒含量最高,平均值为1.04×10^(-6);而潮土硒含量最低,平均值为0.56×10^(-6)。不同土地利用方式间以林地与果园表层土壤中硒含量相对较高,水田、草地和旱地土壤硒含量低。影响土壤硒含量的主要因素是成土母质,有机质含量对土壤硒富集也有一定影响。
This study aims to investigate the distribution characteristics of the total selenium content in soil in karst areas in Mashan County,Guangxi and to explore the effects of different soil parent materials,land uses,and soil types on the selenium content in soil.To this end,492 samples of surface soil(0~20 cm) were collected from the northern part of Mashan County and the distribution of the total selenium content in the samples were studied by statistical methods.The results are as follows.The total selenium content in the soil varies from 0.20×10^(-6) to 3.54×10^(-6),with an average value of 0.76×10^(-6).Meanwhile,the selenium-rich area accounts for 98.29% and the coefficient of variation is 34.49%.The soil in the Permian Heshan formation bearing black shales and coal-measure strata has the highest selenium content,with an average of 1.17×10^(-6),while the Carboniferous Maping formation has the lowest selenium content,with an average of 0.64×10^(-6).In terms of different soil types,the lateritic red soil has the highest selenium content,with an average value of 1.04×10^(-6),while the fluvo-aquic soilhas the lowest selenium content,with an average value of 0.56×10^(-6).In terms of land use types,the forestland and orchard have a high selenium content in soil,while the paddy field,grassland,and arid land have a low selenium content.Therefore,the selenium content in soil in the study area is mainly affected by soil parent materials,with the selenium enrichmentin soil being affected by the organic matter content to a certain extent.
作者
张春来
杨慧
黄芬
曹建华
ZHANG Chun-Lai;YANG Hui;Huang Fen;CAO Jian-Hua(Institute of Karst Geology,Chinese Academy of Geological Sciences Key Laboratory of Karst Dynamics,Ministry of Nature Resources and Science and Guangxi,Guilin 541004,China;International Research Center on Karst under the Auspices of UNESCO,Guilin 541004,China)
出处
《物探与化探》
CAS
北大核心
2021年第6期1497-1503,共7页
Geophysical and Geochemical Exploration
基金
国家自然科学基金重点项目(41530316)
中国地质调查评价项目(DD20160324)
广西自然科学基金(2015GXNSFBA139202)。
关键词
硒
土壤
岩溶
成土母质
土地利用
selenium
soil
karst
soil parent material
land use
