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Effects of four endophytic bacteria on cadmium speciation and remediation efficiency of Sedum plumbizincicola in farmland soil
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Effects of four endophytic bacteria on cadmium speciation and remediation efficiency of Sedum plumbizincicola in farmland soil
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Journal Article
Effects of four endophytic bacteria on cadmium speciation and remediation efficiency of Sedum plumbizincicola in farmland soil
2022
Overview
Cadmium (Cd) pollution in farmland soils severely affects agricultural production safety, thereby threatening human health.
Sedum plumbizincicola
is a Cd and Zn hyperaccumulator commonly used for the phytoremediation of Cd-contaminated soil. This study was aimed to improve the remediation effect of
S. plumbizincicola
on Cd-contaminated farmland soil and provide a theoretical basis for the enhancement of endophytic bacteria in the repair of Cd-contaminated soil with
S. plumbizincicola.
Four kinds of endophytic bacteria, namely
Buttiauxella
,
Pedobacter
,
Aeromonas eucrenophila
, and
Ralstonia pickettii
, were used, and soil culture experiments and pot experiments were conducted to explore the effects of endophytic bacteria on soil Cd speciation and phytoremediation efficiency of Cd-contaminated farmland soils. Under the experimental conditions, after inoculation with endophytic bacteria, the soil pH was effectively reduced, content of weak acid-extracted Cd and oxidizable Cd increased, and content of reducible Cd and residual Cd decreased. Soil Cd activity was increased, and the availability coefficient of soil Cd increased by 1.15 to 6.41 units compared with that of the control (CK
2
). Compared with CK
2
, the biomass of
S. plumbizincicola
significantly increased by 23.23–55.12%; Cd content in shoots and roots of
S. plumbizincicola
increased by 29.63–46.01% and 11.42–84.47%, respectively; and bioconcentration factor was 2.13 to 2.72 times that of CK
2
. The Cd removal rate of
S. plumbizincicola
monocropping was 48.25%. When
S. plumbizincicola
was planted with inoculating endophytic bacteria, the Cd removal rate in the soil reached 61.18–71.49%, which was significantly higher than that of CK
2
(
p
< 0.05). The treatment with endophytic bacteria activated soil Cd, promoted the growth of
S. plumbizincicola
, increased its Cd content, and enhanced the phytoremediation of Cd-contaminated farmland soil. Therefore, endophytic bacteria can be used to improve the remediation efficiency of
S. plumbizincicola
in Cd-contaminated farmland soils.
Publisher
Springer Berlin Heidelberg,Springer Nature B.V
