贵州省桐梓县表层土壤硒地球化学特征及影响因素分析  

Geochemical Characteristics and Influencing Factors of Selenium Distribution in Surface Soil of Tongzi County,Guizhou Province

作　　者：张钟华[1] 季国松[2] 王小洪 安泉[1] 刘浩[1] 潘有良 吴鹏[1] 肖波[1] 王艇 罗建均[1] 王华斌[1] ZHANG Zhong-hua;JI Guo-song;WANG Xiao-hong;AN Quan;LIU Hao;PAN You-liang;WU Peng;XIAO Bo;WANG Ting;LUO Jian-jun;WANG Hua-bin(117 Geological Party,Guizhou Bureau of Geology and Mineral Exploration and Development,Guiyang 550018,Guizhou,China;102 Geological Party,Guizhou Bureau of Geology and Mineral ExploraTion and Development,Zunyi 563000,Guizhou,China)

机构地区：[1]贵州省地矿局117地质大队,贵州贵阳550018 [2]贵州省地矿局102地质大队,贵州遵义563000

出　　处：《贵州地质》2020年第3期289-297,共9页Guizhou Geology

基　　金：贵州省桐梓县耕地质量地球化学调查评价(黔地矿耕调2017-19)。

摘　　要：通过贵州省桐梓县1∶5万土地质量地球化学调查评价工作,查明了境内耕地与园地表层土壤中硒的地球化学分布特征,探讨了影响表层土壤硒含量高低的因素,发现了富硒水稻与方竹笋。结果表明,全区耕地与园地表层土壤硒含量在0.02-6.59 mg/kg之间,平均值为0.58 mg/kg,二叠系龙潭组发育的土壤中硒含量最高,平均值在1.10-1.18 mg/kg之间,侏罗系发育的土壤中硒含量最低,平均值在0.22-0.32 mg/kg之间,其余地层发育的土壤硒平均值在0.42-0.70 mg/kg之间。表层土壤整体上属于富硒土壤,富硒面积70535.52公顷,占总评价面积的70.92%,富硒资源丰富。富硒方竹笋硒含量在0.010-0.050 mg/kg之间,富硒率17.4%;富硒水稻硒含量在0.043-0.050 mg/kg之间,富硒率13.5%,水稻平均生物富集系数大于方竹笋。土壤硒含量高低主要受成土母质影响,土壤理化性质、全氮、全磷、铁锰氧化物、地形地貌与海拔高度等也是影响土壤表层土壤硒富集的重要因素。Based on the investigation and evaluation of 1∶50000 land quality geochemistry in Tongzi County,Guizhou Province,the geochemical characteristics and distribution characteristics of selenium in the surface soil of cultivated land and garden land were identified,the factors affecting the content of selenium in the soil were discussed,and the selenium rich rice and bamboo shoots were found.The results showed that the selenium content in the surface soil of cultivated land and garden land was between 0.02-6.59 mg/kg,with an average of 0.58 mg/kg.The soil developed in Longtan Formation of Permian system had the highest selenium content,with an average of 1.10-1.18 mg/kg.The soil developed in Jurassic system had the lowest selenium content,with an average of 0.22-0.32 mg/kg.The soil developed in other strata had an average of 0.42-0.70 mg/kg.As a whole,the surface soil is rich in selenium,with an area of 70535.52 hectares,accounting for 70.92%of the total assessed area,and rich in selenium resources.The content of Se in square bamboo shoot is between 0.010-0.050 mg/kg,the rate of Se enrichment is 17.4%;the content of Se in rice is between 0.043-0.050 mg/kg,the rate of Se enrichment is 13.5%.The average bioaccumulation coefficient of rice is higher than that of square bamboo shoot.The content of Se in the soil is mainly affected by the parent material.The physical and chemical properties,total nitrogen,total phosphorus,iron and manganese oxides,topography and altitude are also important factors affecting the enrichment of Se in the surface soil.

关 键 词：表层土壤硒 地球化学 影响因素 水稻、方竹笋 桐梓县 

分 类 号：S159[农业科学—土壤学] P632[农业科学—农业基础科学]