Linking Bacterial Growth Responses to Soil Salinity with Cd Availability

文献类型： 外文期刊

第一作者： Wang, Lifu

作者： Wang, Lifu;Qin, Luyao;Sun, Xiaoyi;Zhao, Shuwen;Yu, Lei;Wang, Meng;Chen, Shibao

作者机构：

关键词： Salinity stress; Cd availability; Soil properties; Bacterial growth; SEM

期刊名称：BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY （ 影响因子：2.807； 五年影响因子：2.616 ）

ISSN： 0007-4861

年卷期： 2022 年 109 卷 2 期

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收录情况： SCI

摘要： 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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