Selenium speciation in surface soil in Yaling Town, Yichuan County—Xiaodian Town,Ruyang County in Luoyang City
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摘要: 以洛阳市伊川县鸦岭镇—汝阳县小店镇一带土壤为研究对象,通过表层土壤样品的采集和分析,研究了土壤中硒的形态特征及其影响因素。结果表明,研究区表层土壤中硒的赋存形态以腐殖酸态、残渣态和强有机态为主,水溶态硒和离子交换态硒之和仅占总硒的2.70%,具有水溶态硒含量水平较低,而有机态硒占总硒比例显著高的特征。土壤总硒含量、酸碱度、有机质含量及土壤类型均对土壤中硒的赋存形态有影响。碱性环境土壤中硒有效态量占总硒比例明显高于中性环境和酸性环境土壤;土壤中硒有效态量随着土壤pH值升高而呈增加趋势。土壤中有机质含量对有机态硒影响最显著,而对有效态硒影响不明显。不同土壤类型中,水溶态硒和离子交换态硒之和占总硒比例表现为红黏土>水稻土>褐土>粗骨土>潮土>砂浆黑土。Abstract: Surface soil samples in Yaling Town, Yichuan County -Xiaodian Town, Ruyang County in Luoyang City were collected and analyzed to study the selenium (Se) speciation and its influencing factors. The study results are as follows. Existing Se in the surface soil of the study area mainly occurs in humic acid, residue, and strong organic states, while the sum of Se in water-soluble and ion-exchange states only accounts for 2.70% of total Se in the surface soil. Therefore, the Se in the study area shows the characteristics of the low content of water-soluble Se and a significantly high proportion of organic Se in total Se. The Se speciation in the surface soil is affected by the total Se content, pH, organic matter content, and type of soil. Specifically, the proportion of bioavailable Se in alkaline soil is significantly higher than that in neutral and acidic soils, and the bioavailable selenium content increases with increasing soil pH. Especially, the organic matter content in the soil has the most significant effects on organic Se but has no significant effect on bioavailable Se. For different types of soils, the proportion of the sum of Se in water-soluble and ionic-exchange states in total Se is in the order of red clay>paddy soil>brown soil>skeleton soil>fluvo-aquic soil>lime concretion black soil.
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Key words:
- Luoyang /
- surface soil /
- selenium speciation /
- influencing factor
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