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Effects of fresh and field-aged holm-oak biochar on As, Cd and Pb bioaccumulation in different rice growing environments
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Orientador(es)
Resumo(s)
Arsenic, Cd, and Pb environmental fate is influenced when the traditional permanent flooding rice production systems are
replaced by water-saving and soil conservation practices, urging for additional strategies that avoid their bioaccumulation
in rice grain. The aim of this two-years field study was to evaluate the effects of fresh and field-aged biochar on As, Cd, and
Pb bioaccumulation, and on As speciation, in rice grain produced in different growing environments (flooding versus
sprinkler and conventional tillage versus direct seeding). Biochar produced from holm-oak pruning residues (pyrolysis
at 550 °C, 48 h), in a single application (28Mg ha−1), reduced As bioaccumulation in rice grain in the permanent flooding
system to non-quantifiable concentrations (e.g., from 0.178 mg kg−1 to <0.04 mg kg−1, for inorganic-As, respectively), an
effect which remained under field-aging conditions, increasing rice commercial value. When adopting sprinkler irrigation,
the undesirable increase in Cd bioaccumulation in rice, relatively to the anaerobic system, was counteracted by biochar
application, reducing its bioaccumulation in kernels between 32 and 80%, allowing a simultaneous control ofmetals
and metalloids bioaccumulation in rice. The bioaccumulation of Pb was also prevented with biochar application, with a
reduction in its concentration four- to 13-times, in all the management systems, relatively to the non-amended plots,
under fresh biochar effects. However, Pb immobilization decreased with biochar field-aging, indicating that the biochar
application may have to be repeated to maintain the same beneficial effect. Therefore, the present study shows that the
implementation of sprinkler irrigation with holm-oak biochar could reduce the risk of heavy metals(loids) bioaccumulation
in rice grains and, thereby, ensuring food safety aspects, particularly under fresh biochar effects
Descrição
Palavras-chave
Oryza sativa L. Toxic trace elements Sprinkler irrigation Flooding irrigation Mediterranean environment Soil amendments
Contexto Educativo
Citação
Martín-Franco, C., J. T. Sánchez, P. Alvarenga, D. Peña, D. Fernández-Rodríguez, L. A. Vicente, Á. Albarrán and A. López-Piñeiro (2023). Effects of fresh and field-aged holm-oak biochar on As, Cd and Pb bioaccumulation in different rice growing environments. Science of The Total Environment 887: 164012
Editora
Elsevier