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Isótopos de Cadmio Revelan Vías Dominantes de Deposición Atmosférica en Agroecosistemas
Ruizhi Xia1,2, Xiaowei Xu1, Zhen Zeng1
1State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China.
Environmental science & technology
|January 30, 2026
Resumen
La deposición atmosférica de cadmio (Cd) impacta significativamente la agricultura. Los isótopos estables revelan que la deposición seca influye en el Cd del suelo, y la absorción foliar contribuye sustancialmente a cultivos como el arroz.
Área de la Ciencia:
- Ciencias Ambientales; Ciencias Agrícolas; Geoquímica
Sus antecedentes:
- La deposición atmosférica de cadmio (Cd) presenta riesgos para los ecosistemas agrícolas y la seguridad alimentaria.
- Cuantificar el transporte y la contribución de Cd en los sistemas suelo-cultivo es un desafío.
- Comprender los mecanismos de deposición es crucial para la evaluación de riesgos.
Objetivo del estudio:
- Elucidar la biogeoquímica de la deposición atmosférica de Cd en agroecosistemas.
- Rastrear cuantitativamente las vías y fuentes de Cd utilizando análisis de isótopos estables.
- Evaluar la biodisponibilidad y la absorción de Cd atmosférico por las plantas.
Principales métodos:
- Experimentos de dos años en campo con cámaras abiertas (OTC) y en invernadero.
- Análisis de isótopos estables para rastrear los orígenes y transformaciones del Cd.
- Modelo de mezcla isotópica con factores de fraccionamiento derivados del invernadero para la asignación de fuentes.
Principales resultados:
- El Cd recién depositado envejece rápidamente en los suelos; la biodisponibilidad depende del tipo de deposición (seca vs. húmeda).
- La deposición seca gobierna principalmente la firma isotópica del Cd biodisponible en el suelo.
- La deposición atmosférica contribuye con el 29-65% al Cd biodisponible en el suelo; la absorción foliar excede la absorción radicular en el arroz y la pak choi.
Conclusiones:
- Los isótopos de cadmio son herramientas eficaces para distinguir las vías y fuentes de Cd.
- La absorción foliar de Cd atmosférico es una vía importante para la contaminación de los cultivos.
- Este estudio proporciona un enfoque refinado para la asignación cuantitativa de fuentes en agroecosistemas.
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