摘要
植物中硒被认为是人体摄入硒的主要来源,而且大多数植物是从土壤中吸收硒。因此,不同地区土壤硒含量的高低直接影响到该地区食物中的硒含量。本研究以青海省平安地区农田土壤为研究对象,用原子荧光光谱法进行了土壤全硒含量和形态及价态的测定,对平安地区农田土壤全硒含量分布特征及其与成土母质、土壤类型的关系进行了研究。结果表明,平安地区土壤全硒含量变化范围为0.089~0.782 mg/kg,平均值为0.418 mg/kg,其中58%的土壤属于富硒土壤范畴。研究区域耕种淡栗钙土全硒含量最高,平均值为0.574 mg/kg;而灌淤黄土全硒含量最低,平均值为0.293 mg/kg。成土母质中,古近–新近系西宁群红色泥岩中硒含量最高,平均值为0.82 mg/kg。平安地区富硒土壤中硒的富集主要来源于古近–新近系西宁群红色泥岩风化。土壤中硒的赋存形态主要以有机结合态为主,铁锰氧化物结合态硒含量最少。可溶态硒和可交换态及碳酸盐结合态硒均以六价硒为主要赋存价态。平安地区富硒土壤中硒含量适宜,供硒潜力较大,且该地区受外界环境污染较少,具有良好的开发利用前景。
Selenium （Se） in plants is considered as the main source of selenium intake by human body, and most plants absorb Se from soils. Therefore, Se contents in soil directly affect Se content in food. In this study, farmland soils were studied in Ping＇an area of Qinghai Province, and total Se contents in soils and Se speciation and valence states were determined by atomic fluorescence spectrometry. The distribution of total Se contents in farmland soils and its relationship with soil parent materials and soil types were studied. The results showed that total Se content ranged from 0.089 to 0.782 mg/kg with an average of 0.418 mg/kg, and 58% of soils belongs to Se-rich soils. Total Se content of cultivated light chestnut soil was the highest in the study area, with an average value of 0.574 mg/kg; while was the lowest in irrigated loess, with an average value of 0.293 mg/kg. Se content in red mudstone of Paleogene-Neogene period Xining group was the highest, with an average value of 0.82 mg/kg. Se enrichment in Se-rich soil in Ping＇an area is mainly due to the weathering of red mudstone of Paleogene-Neogene period Xining group. Organic matter-bound Se is the main Se speciation in soils, and iron-manganese oxides-bound Se was the least. Se6＋ was the main valence in soluble, exchangeable and carbonate-bound Se. Se content in Se-rich soil is suitable in Ping＇an area, and it has a good prospect of exploitation and utilization due to the high potential in Se supply and less pollution from external environment.
作者
宋晓珂
李宗仁
王金贵
SONG Xiaoke;LI Zongren;WANG Jingui(College of Agrieulture and Animal Husbandry,Qinghai University,Xining 810016,China;State Key Laboratory of Plateau Ecology and Agriculture,Qinghai University,Xining 81 O016,China)
出处
《土壤》
CAS
CSCD
北大核心
2018年第4期755-761,共7页
Soils
基金
国家自然科学基金青年项目(41401354)
青海省自然科学基金项目(2014-ZJ-928Q)资助
关键词
青海东部
农田土壤
硒
分布特征
影响因素
Eastern Qinghai
Farmland soil
Selenium （Se）
Distribution
Influencing factors
