湖南省石门县耕地土壤硒含量特征及影响因素解析  

Characteristics and Influencing Factors of Soil Selenium in Shimen County,Hunan Province

作　　者：刘瑞 周卫军[1] 彭素华 商贵铎 周雨舟 李敏 LIU Rui;ZHOU Wei-jun;PENG Su-hua;SHANG Gui-duo;ZHOU Yu-zhou;LI Min(College of Resources and Environment,Hunan Agricultural University,Changsha 410128,China;Library of Hunan Agricultural University,Changsha 410128,China)

机构地区：[1]湖南农业大学资源环境学院,湖南长沙410128 [2]湖南农业大学图书馆,湖南长沙410128

出　　处：《土壤通报》2023年第4期840-847,共8页Chinese Journal of Soil Science

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)项目资助。

摘　　要：【目的】弄清石门县耕地土壤硒含量特征及其空间分布规律,为当地富硒农产品的开发提供依据。【方法】采用野外调查与采样、室内分析、数学分析和模型模拟等方法,对全县2647个耕地样点的土壤全硒进行测定,分析石门县耕地土壤全硒含量特征及空间分布规律,并探究其影响因素。【结果】石门县耕地土壤硒含量高,平均含量为1.02 mg kg^(−1),是全国平均含量的3.52倍;石门县富硒耕地面积大,呈现中部高、南北低的特征,中部有富硒带;石灰岩风化物发育的土壤硒含量显著高于其它成土母质发育的土壤,石灰岩土硒含量显著高于潮土和紫色土;土壤硒与有机质呈正相关关系,当pH<5.5时土壤硒随pH增大而减少,当pH>5.5时土壤硒含量随pH增大而增加。【结论】石门县耕地土壤硒含量较高,有从中部往南、北两个方向逐渐降低的趋势;土壤硒继承于成土母质,受淋溶和堆积作用、有机质和pH等因素影响,分布有适合富硒农产品开发和发展的富硒带。[Objective]The aims were to clarify the characteristics and spatial distribution of selenium(Se)content in cultivated soil in Shimen County,and to provide basis for the development of Se-rich agricultural products in shimen County.[Methods]By field investigation and sampling,indoor analysis,mathematical analysis and model simulation,the total Se contents in soil of 2647 cultivated land samples in Shimen County were determined,and the characteristics and spatial distribution of total Se content in cultivated land soil were analyzed,and the influencing factors were explored.[Result]①The average Se content of cultivated soil in Shimen County was 1.02 mg kg^(−1),3.52 times higher than the national average.②The Se-rich cultivated land area in Shimen County was large,showing the characteristics of high in the middle and low in the north and south,and there was a Se-rich zone in the middle.③The Se content of soils developed by limestone weathering materials was significantly higher than that of other soil parent materials,and the Se content of limestone soil was significantly higher than that of Alluvial soil and purple soil.④There was a positive correlation between soil Se and organic matter.When pH<5.5,soil Se contents decreased with the increase of pH;when pH>5.5,soil Se contents enhanced with the increase of pH.[Conclusion]The overall Se content of cultivated soil in Shimen County was relatively higher,and gradually decreased from central to north and south.Soil Se inherits its parent material and is affected by factors such as leaching,deposition,organic matter and pH.There are Se-rich zones suitable for the development of Se-rich agricultural products.

关 键 词：土壤硒 空间分异 成土母质 理化性质 石门县 

分 类 号：S153[农业科学—土壤学]