Selenium (Se) is an essential trace element within human beings that hold with crucial biological functions. Investigating the complex origin of soil Se is of great importance to scientifically approach the land use of Se-rich land use, and the respective promotion of regional economic development. In this study, 160 soil samples from 10 profiles in farmland and woodland were collected in Hailun city, which is a typical black soil region in Northeast China, in order to characterize the distribution and speciation of Se in the black soil, and to identify the origin of soil Se. The total selenium content in the soil ranges from 0.045 to 0.444 μg g-1, with an average selenium content in black soil (0.318 μg g-1) of three times greater than that found in the yellow-brown soil (0.114 μg g-1). The land-use type has a significant influence on the distribution of selenium in the black soil. Moreover, Se and heavy metals have a significant (positive or negative) correlation, in which TOC plays an important role. The black soil presents a consistent REE distribution pattern with underlying yellow-brown soil indicating black soil originates from yellow-brown soil. REE geostatistical analysis suggests that the soil Se partly originates from shale weathering and enriches in black soil. Moreover, elemental geochemical analysis and XRD results show that the paleoclimate change from humid and warm to dry and cold is favorable for organic matter accumulation, resulting in less leaching and enhanced adsorption of selenium into the black soil.

中文翻译：

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东北黑土区土壤硒的分布，来源与形态

硒（Se）是人类中具有重要生物学功能的必需微量元素。研究土壤硒的复杂来源对于科学地研究富硒土地利用的土地利用以及促进区域经济发展具有重要意义。在这项研究中，从东北典型的黑土地区海伦市收集了来自农田和林地的10个剖面的160个土壤样品，以表征黑土中硒的分布和形态，并鉴定硒的形态。土壤硒的起源。土壤中的总硒含量为0.045至0.444μgg-1，黑色土壤中的平均硒含量（0.318μgg-1）是黄棕色土壤中的平均硒含量（0.114μgg-1）的三倍。 1）。土地利用类型对黑土中硒的分布有重要影响。此外，硒和重金属具有显着（正或负）相关性，其中TOC发挥着重要作用。黑色土壤与下层黄棕色土壤呈现出一致的REE分布模式，表明黑色土壤起源于黄棕色土壤。REE地统计分析表明，土壤硒部分来自页岩风化，并富含黑色土壤。而且，元素地球化学分析和X射线衍射结果表明，古气候从潮湿，温暖到干燥和寒冷的变化有利于有机质的积累，从而减少了淋溶并增强了硒在黑土中的吸附。硒与重金属具有显着（正或负）相关性，其中TOC发挥着重要作用。黑色土壤与下层黄棕色土壤呈现出一致的REE分布模式，表明黑色土壤起源于黄棕色土壤。REE地统计分析表明，土壤硒部分源自页岩风化，并富集于黑土中。而且，元素地球化学分析和X射线衍射结果表明，古气候从潮湿，温暖到干燥和寒冷的变化有利于有机质的积累，从而减少了淋溶并增强了硒在黑土中的吸附。硒与重金属具有显着（正或负）相关性，其中TOC发挥着重要作用。黑色土壤与下层黄棕色土壤呈现出一致的REE分布模式，表明黑色土壤起源于黄棕色土壤。REE地统计分析表明，土壤硒部分来自页岩风化，并富含黑色土壤。而且，元素地球化学分析和X射线衍射结果表明，古气候从潮湿，温暖到干燥和寒冷的变化有利于有机质的积累，从而减少了沥滤并增强了硒在黑土中的吸附。REE地统计分析表明，土壤硒部分源自页岩风化，并富集于黑土中。而且，元素地球化学分析和X射线衍射结果表明，古气候从潮湿，温暖到干燥和寒冷的变化有利于有机质的积累，从而减少了淋溶并增强了硒在黑土中的吸附。REE地统计分析表明，土壤硒部分来自页岩风化，并富含黑色土壤。而且，元素地球化学分析和X射线衍射结果表明，古气候从潮湿，温暖到干燥和寒冷的变化有利于有机质的积累，从而减少了淋溶并增强了硒在黑土中的吸附。