Speciation of selenium in typical meadow soils in Tumed Left Banner, Inner Mongolia, China
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摘要: 以内蒙古土默特左旗塔布赛乡表层土壤、土柱剖面等样品为研究对象, 测定了土壤硒形态、有效态、理化性质等指标, 据此研究了土壤硒形态、有效态组成特征及其影响因素。结果表明, 表层土壤硒形态主要以腐殖酸结合态、强有机结合态和残渣态为主; 阳离子交换量(CEC)、有机质、磷、钾含量与腐殖酸结合态硒含量呈正相关, 全量硒含量与腐殖酸结合态硒、铁锰氧化物结合态硒、强有机结合态硒、残渣态硒含量呈正相关, 均表现为促进作用; 硫含量与水溶态硒含量呈负相关, 表现为抑制作用; 由表层至深层, 各形态硒含量具有由高趋低特征; 有效硒含量与全量硒、有机结合态硒、水溶态硒含量呈正相关, 与硫含量呈负相关性。研究区土壤中水溶态硒含量处于高硒等级状态, 生物有效性处于较高水平, 适合种植、开发富硒农产品。Abstract: This study determined the speciation, available content, and physicochemical properties of selenium in soils using samples of topsoil and soil column profiles from Tabusai Township, Tumed Left Banner, Inner Mongolia, China. Accordingly, this study investigated the compositions of the speciation and available content of soil selenium, as well as their influencing factors. The results indicate that: (1) the major forms of selenium in topsoil include humic acid bound, strong organic bound, and residue forms; (2) the concentration of in the humic acid bound selenium correlates positively with the cation exchange capacity (CEC) and the concentrations of organic matter, phosphorus, and potassium; the total selenium concentration correlates positively with the concentrations of humic acid bound selenium, Fe-Mn oxide bound selenium, strong organic bound selenium, and residue selenium, all of which exhibit promotion effects; (3) the sulfur concentration correlates negatively with the concentration of water-soluble selenium, demonstrating an inhibitory effect; (4) the concentrations of selenium in various forms tend to decrease from the surface layer to the deep layer; (5) the concentration of bioavailable selenium correlates positively with the total selenium concentration, organic-bound selenium, and water-soluble selenium and correlates negatively with the sulfur concentration. The soils in the study area, featuring a high concentration of water-soluble selenium and fairly high bioavailability, are suitable for planting selenium-rich agricultural products.
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Key words:
- selenium speciation /
- meadow soil /
- Tumed Left Banner /
- Inner Mongolia
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