Zhang H H, Wu Z F, Yang C L, Xia B, Xu D R, Yuan H X
Guangdong Institute of Eco-environmental and Soil Sciences, Guangzhou, China.
J Environ Qual. 2008 May 2;37(3):780-7. doi: 10.2134/jeq2007.0154. Print 2008 May-Jun.
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.
共检查了260个土壤剖面，以研究中国广东省土壤总硒（Se）的空间分布。在研究区域内，土壤硒浓度呈近似对数正态分布。土壤硒几何平均浓度为0.23 mg kg⁻¹，高于中国土壤的平均浓度；然而，研究区域内硒浓度存在差异。0.13至0.41 mg kg⁻¹的基线浓度表明，广东省表层土壤的硒浓度大多处于缺乏至中等水平范围。在A层、B层和C层中，土壤硒的空间分布与母质性质相关，高硒浓度主要位于石灰岩和砂页岩地区，而低硒浓度与紫色页岩和花岗岩地区相关。土壤硒浓度的空间分布模式表明，该省可能存在潜在的硒缺乏对人类健康构成问题。此外，由于土壤退化和侵蚀，研究区域内计算得出输入周边水体的土壤硒可达约23,000 kg yr⁻¹ 。
