摘要
铜仁地处贵州东北部,处于黔湘渝三省(市)结合部位,矿产资源丰富,该区富硒土壤的地球化学特征及富集特征等方面的研究较为薄弱,限制了全区富硒特色土地资源的开发利用。通过对铜仁地区1∶5万比例尺耕地质量地球化学调查成果数据进行整理与分析,并结合区域地质背景等资料,系统总结铜仁地区土壤硒元素地球化学特征与富集程度,研究了土壤硒元素空间分布特征及影响因素。结果表明:铜仁地区土壤硒含量背景值为0.37 mg/kg,低于全国大部分省市背景值;铜仁地区含硒土壤占全区耕地面积的47.68%,清洁富硒土壤占全区耕地面积的50.01%,硒含量高值区主要分布于松桃县中部、德江县东部等地;该区硒含量总体东高西低,呈条带状、面状分布,西部富硒土壤受二叠系吴家坪组煤系地层控制明显,东部受寒武系牛蹄塘组黑色岩系与铅锌-汞成矿带联合控制;区内土壤硒含量受控于土壤类型、土地利用方式、有机质含量、土壤酸碱度等因素,且与汞、镉等重金属元素关系密切。铜仁西部石阡龙塘、德江枫香坪等地区有较好的富硒土壤开发优势,可通过种植大豆、茶叶等农作物发展富硒特色产业链。
Tongren is located in the northeast of Guizhou and at the junction of Guizhou,Hunan and Chongqing provinces(cities).It is rich in mineral resources.However,the research on the distribution and enrichment characteristics of selenium-rich soil in this area is relatively weak,which limits the development and utilization of selenium-rich characteristic land resources in Guizhou.Based on the collation and analysis of the data of 1∶50000 scale cultivated land quality geochemical survey in Tongren area,and combined with other data such as regional geological background,the spatial distribution characteristics of soil selenium in Tongren area were systematically summarized.The spatial distribution characteristics and influencing factors of selenium in soil were studied.The results show that the background value of soil selenium content in Tongren area is 0.37 mg/kg,which is lower than that of most provinces and cities in China.The selenium-containing soil accounts for 47.68%of the cultivated land area in Tongren area,the clean selenium-rich soil accounts for 50.01%of the cultivated land area in Tongren area,the areas with high selenium content are mainly distributed in the middle of Songtao County and the eastern part of Dejiang County.The selenium content in Tongren area is generally high in the east and low in the west,showing banded and areal distribution,the selenium-rich soil in the western part of this area is obviously controlled by the coal-bearing rock stratum of Permian Wujiaping Formation,the eastern part of this area is controlled by the black rock stratum of Cambrian Niutitang Formation and the lead-zinc-mercury mineralizing belts.Soil selenium content in Tongren area is controlled by soil types,land use patterns,organic matter contents,soil acidity and alkalinity and other factors,and is closely related to heavy metal elements such as mercury and cadmium.There are good advantages in the development of selenium-rich soil in Shiqian Longtang and Dejiang Fengxiangping in the west of Tongren.These areas can develop characteristic selenium-rich industrial chain by planting soybean,tea and other crops.
作者
洪万华
苏特
涂飞飞
蒋天锐
张德实
余万泽
HONG Wanhua;SU Te;TU Feifei;JIANG Tianrui;ZHANG Deshi;YU Wanze(Geological Party,Bureau of Geology and Mineral Exploration and Development of Guizhou Province,Tongren 554300,China)
出处
《金属矿山》
CAS
北大核心
2021年第12期160-168,共9页
Metal Mine
基金
贵州省铜仁市耕地质量地球化学调查评价项目(编号:黔地矿耕调2017-29)。
关键词
硒
地球化学特征
分布规律
影响因素
重金属
铜仁
selenium
geochemical characteristics
distribution law
influencing factors
heavy metal
Tongren
