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<p>Understanding the accumulation and mobility of soil elements under different land-use types is essential for assessing environmental quality and plant uptake risk. This study investigated the effects of a 10-year land-use change from paddy fields to abandoned land on soil organic carbon (SOC), total nitrogen (TN), and trace elements, including essential elements (B, Mo, Cu, Zn) and potential toxic elements (PTEs: As, Pb, Cr, Cd) in Danang, central Viet Nam. Results showed that SOC was significantly lower in abandoned soils than in paddy and bund soils (<i>P</i> &lt; 0.05), whereas TN showed no significant difference. Bioconcentration factor (BCF) analysis indicated that most trace elements had low BCF values (0.01–1.1), except for Mo and Cd (BCF range: 1.58–45.95), with generally higher BCFs observed in abandoned soils than in paddy soils, suggesting an increased accumulation potential after abandonment. Principal component analysis (PCA) revealed that SOC and TN were strongly associated with toxic elements, including Cd, Cr, and Pb. In contrast, essential elements like Mo, B, and Zn were loaded in the opposite direction. Soil sample clustering further indicated that paddy soils were enriched in SOC, TN, and PTEs; abandoned soils were associated with B, Mo, and Pb; and bund soils were richer in Zn and Cu. These findings underscore the impact of land use on soil quality and potential risks of element transfer to crops, with implications for sustainable soil management and food safety.</p>

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Impact of land-use conversion from a long-term paddy to abandoned field on the distribution of C, N, and trace elements: a study in central Viet Nam

  • 期刊论文

  • 发表日期：

    2025年11月10日

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  • Nguyen-Sy Toan,
  • Tran Ngoc-Son,
  • Nguyen Van An,
  • Do Hong Hanh,
  • Tran Thi Phu,
  • Huynh Hai,
  • Huynh Thi Diem Uyen,
  • Phan Chi Uyen

摘要

Understanding the accumulation and mobility of soil elements under different land-use types is essential for assessing environmental quality and plant uptake risk. This study investigated the effects of a 10-year land-use change from paddy fields to abandoned land on soil organic carbon (SOC), total nitrogen (TN), and trace elements, including essential elements (B, Mo, Cu, Zn) and potential toxic elements (PTEs: As, Pb, Cr, Cd) in Danang, central Viet Nam. Results showed that SOC was significantly lower in abandoned soils than in paddy and bund soils (P < 0.05), whereas TN showed no significant difference. Bioconcentration factor (BCF) analysis indicated that most trace elements had low BCF values (0.01–1.1), except for Mo and Cd (BCF range: 1.58–45.95), with generally higher BCFs observed in abandoned soils than in paddy soils, suggesting an increased accumulation potential after abandonment. Principal component analysis (PCA) revealed that SOC and TN were strongly associated with toxic elements, including Cd, Cr, and Pb. In contrast, essential elements like Mo, B, and Zn were loaded in the opposite direction. Soil sample clustering further indicated that paddy soils were enriched in SOC, TN, and PTEs; abandoned soils were associated with B, Mo, and Pb; and bund soils were richer in Zn and Cu. These findings underscore the impact of land use on soil quality and potential risks of element transfer to crops, with implications for sustainable soil management and food safety.