Parent material modulates land use effects on soil selenium bioavailability in a selenium-enriched region of southwest China

文献类型： 外文期刊

第一作者： Xiao, Kongcao

作者： Xiao, Kongcao;Tang, Junjie;Chen, Hao;Li, Dejun;Xiao, Kongcao;Tang, Junjie;Chen, Hao;Li, Dejun;Lu, Lufeng;Tang, Junjie;Liu, Yongxian

作者机构：

关键词： Selenium; Bioavailability; Parent material; Land use; Soil properties; Southwest China

期刊名称：GEODERMA （ 影响因子：6.114； 五年影响因子：6.183 ）

ISSN： 0016-7061

年卷期： 2020 年 376 卷

页码：

收录情况： SCI

摘要： Land use effects on the biogeochemical cycling of the essential trace element selenium (Se) and underlying mechanisms are not well understood yet. Here, total Se (Se-total) and its potential bioavailability, as represented by phosphate extractability (Se-phosphate), were evaluated in top soils (0-15 cm) of cropland and woodland over two contrasting geological parent materials (i.e. limestone versus clasolite) in a Se-enriched region of southwest China. After about twenty years of conversion of land use from cropland to woodland, Se-total in soils significantly (P < 0.05) and marginally significantly (P < 0.1) increased over limestone and clasolite, respectively. In terms of Se-phosphate it was not significantly changed after land use change from cropland to woodland in soil over limestone, whereas remarkably increased in soil over clasolite (P < 0.01). Furthermore, a significant positive relationship between Se-phosphate and Se-total was found in soil over clasolite, but not in soil over limestone. Land use conversion from cropland to woodland caused a decrease in the proportion of Se-phosphate in Se-total over limestone, while the opposite was found over clasolite. In comparison, the proportion of Se-phosphate in Se-total was greater in cropland over limestone than that in cropland over clasolite, indicating that limestone derived soils may have an advantage of producing Se-rich food over clasolite derived soils. SOC content and quality (i.e. C:N ratio) crucially determined Se accumulation and bioavailability in soil over limestone, while pH played a vital role in soil over clasolite. Taken together, our results provide strong evidence that land use effects on Se biogeochemistry can be substantially modulated by the underlying geology, and have important practical implications for effective utilization and management of Se-enriched soil resources in other parts of the world.

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