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<p>Using high concentrations of copper (Cu) can effectively inhibit root entanglement of container-grown woody seedlings. However, it is unclear if excessive Cu disrupts the absorption of other essential nutrients, alters root-stem-leaf nutrient allocation, and induces stoichiometric imbalance. Here, <i>Camphora officinarum</i> seedlings were planted in containers coated with 120&#xa0;g L<sup>− 1</sup> (T1) and 200&#xa0;g L<sup>− 1</sup> Cu(OH)<sub>2</sub> (T2) to investigate how high Cu affected the accumulation and allocation of iron (Fe), zinc (Zn), manganese (Mn), calcium (Ca), magnesium (Mg), nitrogen (N), phosphorus (P), and potassium (K). T1 and T2 caused uneven Cu distribution in the soil and roots with higher values near the container wall. Soil Cu concentration near the container wall in T1 and T2 was 18.6 and 25.2 times, and root Cu concentration was 19.3 and 32.1 times higher than those in the control. There was no significant difference in Cu translocation factor from roots to shoots between T1 and T2, showing an average 77.6% reduction compared to the control. T2 increased Ca, Mn, P, and K, while decreasing Fe, Zn, Mg, and N concentrations in roots. In contrast, concentrations of P, Mn, Fe increased, Ca decreased, Zn, Mg, N, K did not change for leaves in T2. Cu(OH)<sub>2</sub> treatment changed stoichiometric ratios of Cu to other nutrients in roots, stems, and leaves, as well as ratios between multi-nutrients. Nutrient imbalance was pronounced in roots in T1 and T2, mainly resulting from extremely high Cu accumulation. Root Cu sequestration effectively prevents excessive Cu translocation to shoots. The maintenance of leaf Cu stability is at the cost of disturbed stoichiometric ratios of Cu to other nutrients.</p>

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Excessive Copper Alters Organ-Specific Nutrient Allocation and Causes Nutrient Imbalance in Container-Grown Camphora Officinarum Seedlings

  • 期刊论文

  • 发表日期：

    2025年11月10日

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  • Can Liu,
  • Ying Zhang,
  • Shiyun Wu,
  • Ming Yang,
  • Chunliang Zhou,
  • Yumei Zhou

摘要

Using high concentrations of copper (Cu) can effectively inhibit root entanglement of container-grown woody seedlings. However, it is unclear if excessive Cu disrupts the absorption of other essential nutrients, alters root-stem-leaf nutrient allocation, and induces stoichiometric imbalance. Here, Camphora officinarum seedlings were planted in containers coated with 120 g L− 1 (T1) and 200 g L− 1 Cu(OH)2 (T2) to investigate how high Cu affected the accumulation and allocation of iron (Fe), zinc (Zn), manganese (Mn), calcium (Ca), magnesium (Mg), nitrogen (N), phosphorus (P), and potassium (K). T1 and T2 caused uneven Cu distribution in the soil and roots with higher values near the container wall. Soil Cu concentration near the container wall in T1 and T2 was 18.6 and 25.2 times, and root Cu concentration was 19.3 and 32.1 times higher than those in the control. There was no significant difference in Cu translocation factor from roots to shoots between T1 and T2, showing an average 77.6% reduction compared to the control. T2 increased Ca, Mn, P, and K, while decreasing Fe, Zn, Mg, and N concentrations in roots. In contrast, concentrations of P, Mn, Fe increased, Ca decreased, Zn, Mg, N, K did not change for leaves in T2. Cu(OH)2 treatment changed stoichiometric ratios of Cu to other nutrients in roots, stems, and leaves, as well as ratios between multi-nutrients. Nutrient imbalance was pronounced in roots in T1 and T2, mainly resulting from extremely high Cu accumulation. Root Cu sequestration effectively prevents excessive Cu translocation to shoots. The maintenance of leaf Cu stability is at the cost of disturbed stoichiometric ratios of Cu to other nutrients.