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The Responses Of A Soil B.acterial Community Under Saline S tress Are Associated With Cd Availability In Long-Term Wastewater-Irrigated Field Soil

文献类型： 外文期刊

作者： Wang, M; Chen, SB; Chen, L; Wang, D; Zhao, CM

作者机构：

关键词： Cadmium; Saline stress; Bacterial community; Wastewater irrigation

期刊名称： CHEMOSPHERE

ISSN： 0045-6535

年卷期： 2019 年 236 卷

页码：

收录情况： JCR（2021版） ; EI（2021版）

摘要： Long-term wastewater irrigation impacts soil geochemical properties (salinity, pH and soil aggregates) and promotes the bioaccumulation of heavy metals to plants, which may change soil function, decrease soil health, decrease the productivity of farmland, and even cause land degradation. In this study, we explored the impact of saline stress on soil bacterial communities and Cd availability in long-term wastewater-irrigated field soil. Different amounts of saline stress by adding 0.1, 0.3 and 0.5% salts in a fixed proportion (NaCl: Na2SO4: NaHCO3: Na2CO3=1:9:9:1) were applied in a 1-year, multiple cropping system with winter wheat (Triticum aestivum L) and summer maize (Zea mays L.) in wastewater-polluted soil. Increased salinity in the soil increased Cd availability: compared with CK (no extra salts addition), addition of 0.5% mixed salts significantly increased soil available Cd up by 67.5% and grain Cd concentration by 43.7%, and adding 0.5% salts also resulted in the increases of soil pH (similar to 0.5 unit) and electric conductivity (97.4%). Soil saline stress significantly changed major soil microbes in Cd-contaminated soil. Increased saline stress enriched taxa in the Bacillaceae, Staphylococcaceae and Pseudomonadaceae bacterial families, while one family within Proteobacteria (Sphingomonadaceae) was the most sensitive biomarker, based on Cd contamination without saline stress in CK-treated soils. Structural equation modeling (SEM) analysis revealed that soil saline stress induced an increase in soil Cd availability that was regulated by the bacterial community. (C) 2019 Elsevier Ltd. All rights reserved.

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