摘要
硒是人体必需的营养元素之一。为调查了解德江县耕地、农作物以及不同成土母岩、不同土壤类型、不同耕地类型中硒含量特征。以2017—2019年实施的贵州省德江县耕地质量地球化学调查项目获得数据为依托,对耕地硒元素地球化学图、养分评价等级图,农作物及对应根系土硒检测值,不同成土母岩、不同土壤类型、不同耕地类型特征值进行了分析研究。结果显示全县耕地富硒面积丰富,合计59.56万亩,占耕地面积55.29%。农作物中水稻、玉米、大豆均有富硒,大豆对土壤硒富集强弱力最大,水稻次之,玉米、茶叶相近,天麻最小。不同成土母岩区耕地硒含量灰岩区最高,均值为0.45 mg/kg,白云岩区次之,为0.43 mg/kg,砂岩区相对较低,为0.33 mg/kg。不同土壤类型耕地硒含量黄壤最高,为0.44 mg/kg,紫色土最低,为0.35 mg/kg,石灰土、水稻土、潮土相近。不同耕地类型硒含量茶园最高,为0.47 mg/kg,裸地、旱地其次,为0.42 mg/kg,水田、果园、水浇地相近。不同pH值耕地强酸性硒含量略高,为0.47 mg/kg,其它酸碱度耕地硒含量均值相近,约为0.42 mg/kg。
Selenium is one of the essential nutrients for the human body.In order to investigate and understand the characteristics of selenium content in cultivated land,crops,and different parent rocks,different soil types,and different cultivated land types in Dejiang county.Based on the data obtained from the cultivated land quality geochemical survey project of Dejiang county,Guizhou Province from 2017 to 2019,based on the selenium element geochemical map of cultivated land,nutrient evaluation level map,selenium detection value of crops and corresponding root soils,The characteristic values of different soil types and different cultivated land types were analyzed and studied.The results show that the county’s cultivated land is rich in selenium,with a total area of 596600 mu,accounting for 55.29%of the cultivated land area.Rice,corn,and soybean are all rich in selenium in crops.Soybean has the strongest strength on soil selenium accumulation,followed by rice,corn and tea are similar,and gastrodia elata is the smallest.The selenium content of the cultivated land in the different parent rocks is the highest in the limestone area,with an average value of 0.45 mg/kg,followed by the dolomite area with 0.43 mg/kg,and the sandstone area is relatively low,with 0.33 mg/kg.Different soil types have the highest selenium content in yellow soil,0.44 mg/kg,and purple soil,the lowest,0.35 mg/kg.Lime,paddy,and fluvo-aquic soils are similar.The selenium content in different cultivated land types was the highest in tea gardens,at 0.47 mg/kg,followed by bare and dry lands at 0.42 mg/kg.The content of strongly acidic selenium in cultivated land at different pH values was slightly higher,at 0.47 mg/kg,and the mean value of selenium content in other pH farmlands was similar,about 0.42 mg/kg.
作者
张德实
杨炳南
洪万华
沈小庆
韩姚飞
ZHANG De-shi;YANG Bin-nan;HONG Wan-hua;SHEN Xiao-qing;HAN Yao-fei(103 Geologic Party,Guizhou Bureau of Geology&Mineral Exploration and Development,Tongren 554300,Guizhou,China;School of Earth Sciences,China University of Geosciences,Wuhan 430074,Hubei,China)
出处
《贵州地质》
2020年第3期298-304,共7页
Guizhou Geology
关键词
富硒
耕地
农作物
成土母岩
土壤类型
耕地类型
Selenium-rich
Cultivated land
Agricultural products
Soil forming rock
Soil type
Cultivated land type
