Oxygen Nanobubble-Loaded
Biochars Mitigate Copper
Transfer from Copper-Contaminated Soil to Rice and Improve Rice Growth
Posted on 2023-03-18 - 18:06
Copper
(Cu)-contaminated paddy soil has caused substantial concerns
for human health through biomagnification in the soil–rice–human
chain. In this study, oxygen nanobubble-loaded biochars (ONBC), including
pyrochars (NPC) and hydrochars (NHC), were used to amend Cu-contaminated
paddy soils and reduce rice Cu toxicity. The ONBC amendment improved
the rhizospheric redox potential and dissolved oxygen concentration
via slow, continuous oxygen release, promoting root iron plaque formation
and effectively inhibiting root Cu influx. Moreover, the ONBC amendment
improved soil microbial diversity. The abundance of bacterial genes
involved in cytosolic Cu complexation and Cu export to the periplasm
space for Cu stabilization markedly improved. The sequestered Cu in
root iron plaque and soil bacteria inhibited Cu influx into the shoots
to avoid Cu overaccumulation in the edible parts. This was reflected
by the Cu content decreasing by 1.91-fold and 2.38-fold in shoots
under NPC and NHC treatments, respectively. Furthermore, the improved
oxygen-enriched rhizosphere environment via the ONBC amendment promoted
root activity and the abundance of bacterial genes involved in nutrients
mineralization, further promoting shoot biomass by 1.46-fold and 2.29-fold
under NPC and NHC treatments, respectively. This study proposes an
environmentally friendly strategy to mitigate Cu transfer from soil
to crops and improve crop productivity.
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Chu, Qingnan; Sha, Zhimin; Li, Detian; Feng, Yanfang; Xue, Lihong; Zhou, Dongmei; et al. (2023). Oxygen Nanobubble-Loaded
Biochars Mitigate Copper
Transfer from Copper-Contaminated Soil to Rice and Improve Rice Growth. ACS Publications. Collection. https://doi.org/10.1021/acssuschemeng.2c06776