数字农科院2.0

Effects of elevation and geomorphology on cadmium, lead and chromium enrichment in paddy soil and rice: A case study in the Xiangtan basin of China

文献类型： 外文期刊

作者： Xue W.;Wang C.;Pan S.;Zhang C.;Huang Y.;Liu Z.

作者机构：

关键词： Cadmium;Elevation;Lead;Organic matter;Rice;River valley

期刊名称： Science of the Total Environment

ISSN： 0048-9697

年卷期： 2024 年 912 卷

页码：

收录情况： SCIE（2024版） ; ; EI（2024版）

摘要： The distributions of heavy metals in paddy fields and rice along river valleys were studied to explore the key factors affecting the accumulation of heavy metals in the upstream terraces and downstream plains. Results from 975 sampling sites showed that elevation, growing season and soil organic matter (OM) had significant effects on the content of Cd and Pb in topsoil and rice. The content of Cd (0.47–0.66 mg kg−1) and Pb (49.9–68.6 mg kg−1) in paddy fields with low elevation (30–60 m) in the downstream plains was significantly higher than the content of Cd (0.29–0.38 mg kg−1) and Pb (43.9–56.3 mg kg−1) in the upstream terraces with high altitude (60–90 m). In the double-rice production area, late rice generally produced grains with higher Cd and Pb content than early rice. Soil Cd was positively increased with the content of OM, especially in the downstream plains. When elevation was used for principal component analysis, plains with low elevation were grouped together with high content of total and soluble Cd, OM and Pb in soil, as well as high content of Cd and Pb in late rice. Altitude is one of the key factors affecting Cd content in rice. Although content of Cr (93.7–138.0 mg kg−1) was significantly higher than that of Cd and Pb in soil, content of Cr was lower than that of Cd in rice. These results indicate that paddy fields with elevation of 30–60 m in the downstream plains had high risk to produce late rice with Cd and Pb content exceeding the food safety standard 0.2 mg kg−1, which may be resulted from the driving force of runoff on soil soluble Cd and Pb from terraces to alluvial plains in river valleys. © 2023 Elsevier B.V.

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