摘要
硒是人体及动物必需的微量营养元素之一.在龙山县耕地区系统地采集了326件表层土壤样品进行分析测试,研究了区域内土壤硒含量空间分布特征、空间变异特性、垂向分布特点及其影响因素,分析了土壤有效态硒的影响因素.结果表明,研究区土壤硒平均含量为0.33 mg·kg^(-1),土壤有机质平均含量为20.7 g·kg^(-1),土壤呈酸性.土壤硒含量呈中等空间变异,垂向分布呈表层富集的规律.研究区内硒含量主要受成土母质与土地利用的双重影响,有机质含量与硒含量呈显著正相关关系(P<0.01).土壤硒形态以腐殖酸结合态与强有机结合态为主,有效硒组分占比较低,土壤硒的生物有效性受硒全量和酸碱度影响较大,可以通过人为方式适当调整土壤酸碱度,提高硒生物有效性,有效提升土地利用价值.
Se is one of the essential micronutrients for human body and animals.326 surface soil samples were systematically collected in the cultivated area of Longshan County for analysis and testing.The spatial distribution characteristics,spatial variation characteristics,vertical distribution characteristics and influencing factors of soil Se content in the region were studied,and the influencing factors of soil available Se were analyzed.The results showed that the average content of Se in the study area was 0.33 mg·kg^(-1),and the average content of soil organic matter was 20.7 g·kg^(-1).The soil was acidic.The soil of Se content showed medium spatial variation,and the vertical distribution showed the law of surface enrichment.Se content is mainly affected by soil forming parent material and land use in the study area,and there is a significant positive correlation between organic matter content and Se content(P<0.01).The forms of soil Se are mainly humic acid bound and strong organic bound,and the effective Se components account for a relatively low proportion.The bioavailability of soil Se is greatly affected by the total amount of Se and pH.the soil pH can be adjusted artificially to improve the bioavailability of Se,effectively improve the value of land use.
作者
肖凯琦
徐宏根
李毅
郭威
戴亮亮
彭志刚
巩浩
许青阳
XIAO Kaiqi;XU Honggen;LI Yi;GUO Wei;DAI Liangliang;PENG Zhigang;GONG Hao;XU Qingyang(Changsha General Survey of Natual Resources Center,Changsha,410625,China)
出处
《环境化学》
CAS
CSCD
北大核心
2024年第2期464-474,共11页
Environmental Chemistry
基金
中国地质调查局项目(DD20211576)资助。
关键词
表层土壤
硒元素
空间分布
影响因素
湖南龙山
top soil
Se
spatial distribution
influencing factors
Longshan
Hunan Province
