Abstract
This study investigated the effects of different types of saline stress on the availability of cadmium (Cd) and bacterial growth. Changes in soil physicochemical properties and DTPA-Cd content as well as microbial responses after the addition of salts were measured. The addition of 18 g kg−1 of salts with NaCl and Na2SO4 increased the available Cd content by up to 17.80%–29.79%. Respiration rate, biomass, and relative bacterial growth decreased with increasing salt concentrations. Estimated salinity tolerance of bacterial communities based on pollution-induced community tolerance. The salinity tolerance index EC50 of the bacterial community was estimated by logistic equation and ranged from 4.32–12.63 g kg−1. Structural equation modeling showed that soil salinity stress significantly affected Cd availability and bacterial community, while bacterial growth characteristics also contributed to reducing available Cd. We conclude that saline stress can alter soil Cd availability in soils by affecting the growth characteristics of soil bacterial communities.
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This work was funded by the National Key Research and Development Program of China (2020YFC1806300-04) and Fundamental Research Funds for Central Non-profit Scientific Institution (1610132021008).
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Wang, L., Qin, L., Sun, X. et al. Linking Bacterial Growth Responses to Soil Salinity with Cd Availability. Bull Environ Contam Toxicol 109, 286–297 (2022). https://doi.org/10.1007/s00128-022-03515-5
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DOI: https://doi.org/10.1007/s00128-022-03515-5