洪江市耕地土壤硒含量分布特征及其影响因素  

Distribution Characteristics and Influencing Factors of Selenium Content in Cultivated Soil in Hongjiang City

作　　者：岳晴晴 周卫军[1] 龙立长 丁庭康 商贵铎 崔浩杰 YUE Qing-qing;ZHOU Wei-jun;LONG Li-chang;DING Ting-kang;SHANG Gui-duo;CUI Hao-jie(College of Natural Resources and Environment,Hunan Agricultural University,Changsha 410128,China;Agricultural and Rural Bureau of Hongjiang City,Hongjiang 418200,China)

机构地区：[1]湖南农业大学资源环境学院,湖南长沙410128 [2]湖南省洪江市农业农村局,湖南洪江418200

出　　处：《长江流域资源与环境》2023年第5期1080-1089,共10页Resources and Environment in the Yangtze Basin

基　　金：国家现代农业产业技术体系建设专项(CARS-26);湖南省耕地重金属加密调查项目(2020ST-01)。

摘　　要：探究洪江市耕地土壤硒分布特征及规律,分析土壤理化性质对土壤硒分布的影响,能促进当地土地资源的合理开发和利用,对发展特色富硒产品具有重要意义。在洪江市采用室内网格布点、野外调查采样、分析测定、GIS空间分析等方法与技术,采集和测定分析了1 480个样品的土壤硒(Se)含量及相关土壤理化指标,结合相关性分析、地统计分析与空间自相关分析等方法,揭示洪江市土壤硒的空间分布特征及其影响因素。结果表明:洪江市土壤硒含量平均值为0.54 mg·kg^(-1),是全球表层土壤硒含量平均值(0.4 mg·kg^(-1))的1.35倍,是全国表层土壤硒含量平均值(0.29 mg·kg^(-1))的1.86倍。石灰岩风化物发育的土壤硒含量显著高于其他母质发育的土壤硒含量;紫色土硒含量最高,潮土硒含量最低。土壤硒含量受有机质含量、pH值及铜、锌含量的影响。当pH在5.0~6.0之间,土壤硒含量与pH呈正相关,当pH>6.0时土壤硒含量与pH呈负相关;土壤硒含量与土壤有机质、铜、锌含量呈正相关。洪江市耕地富硒面积占比达到90.53%,在空间上呈现东部高、中北部低,自东、南、西三面向中北部逐渐降低的趋势,适合开发特色富硒产品。It is of great significance to explore the distribution characteristics and regularity of selenium in cultivated soil in hongjiang city and analyze the influence of soil physical and chemical properties on soil selenium distribution,which can promote the rational development and utilization of local land resources.Soil selenium(Se)content and related soil physical and chemical indexes of 1480 samples were collected and analyzed by using indoor grid distribution,field investigation and sampling,analysis and determination,GIS spatial analysis and other methods and techniques in Hongjiang City.Combined with correlation analysis,geostatistical analysis and spatial autocorrelation,the spatial distribution characteristics and influencing factors of soil selenium in Hongjiang City were revealed.The results showed that the average soil selenium content in Hongjiang City was 0.54 mg·kg^(-1),which was 1.35 times that of the global average surface soil selenium content(0.4 mg·kg^(-1))and 1.86 times that of the national average surface soil selenium content(0.29 mg·kg^(-1)).The selenium content in the soil developed from limestone was significantly higher than that of soil developed from other parent materials;Selenium content is highest in purple soil and lowest in Alluvial soil.Soil selenium content was affected by organic matter content,pH,copper and zinc content.When pH was between 5.0~6.0,soil selenium content was positively correlated with pH,and when pH>6.0,soil selenium content was negatively correlated with pH;Soil selenium content was positively correlated with soil organic matter,total copper and total zinc content.The area of selenium-rich cultivated land in Hongjiang City accounted for 90.53%,showing a trend of high in the east and low in the north and north,and gradually decreasing from the east,south and west to the middle and north,which was suitable for the development of characteristic selenium-rich products.

关 键 词：土壤硒 空间变异 成土母质 影响因素 

分 类 号：S153[农业科学—土壤学]