A total of 260 soil profiles were examined to investigate the spatial distribution of total soil selenium (Se) in Guangdong province, China. In the investigated area, the soil Se concentrations follow an approximately lognormal distribution. The soil Se geometric mean concentration of 0.23 mg kg(-1) is higher than that of Chinese soils; however, Se concentration varies over the study area. The baseline concentration of 0.13 to 0.41 mg kg(-1) indicates that the soil Se concentration is mostly in the range of deficiency to medium level for surface soils in Guangdong province. In A-, B-, and C-horizon, soil Se spatial distribution is correlated with the nature of the parent material, with high Se concentration mainly located in limestone and sandshale areas and low Se concentration associated with purple shale and granite areas. The spatial distribution pattern of soil Se concentrations suggests that potential Se deficiency may be an issue for human health in this province. Moreover, due to soil degradation and erosion, calculated soil Se exported into surrounding waters could reach approximately 23,000 kg yr(-1) in the study area.
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机译：共检查了260个土壤剖面，以调查中国广东省土壤总硒（Se）的空间分布。在调查区域中，土壤硒浓度遵循对数正态分布。土壤硒的几何平均浓度为0.23 mg kg（-1），高于中国土壤。然而，硒的浓度在研究区域内有所不同。基线浓度为0.13至0.41 mg kg（-1）表明，广东省表层土壤的Se含量大部分处于缺乏到中等水平的范围内。在A，B和C地平线中，土壤Se的空间分布与母体的性质有关，Se的高浓度主要集中在石灰岩和砂页岩地区，而Se的低浓度则与紫色页岩和花岗岩地区相关。土壤硒浓度的空间分布格局表明，潜在的硒缺乏可能是该省人类健康的一个问题。此外，由于土壤退化和侵蚀，在研究区域内，计算出的出口到周围水体的土壤硒可能达到约23,000 kg yr（-1）。
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