Ecological responses of bacterial assembly and functions to steep Cd gradient in a typical Cd-contaminated farmland ecosystem
文献类型： 外文期刊
作者： Deng, Yan 1 ; Fu, Shaodong 2 ; Sarkodie, Emmannuel Konadu 2 ; Zhang, Shuangfei 2 ; Jiang, Luhua 2 ; Liang, Yili 2 ; Yin, Huaqun 2 ; Bai, Lianyang 1 ; Liu, Xueduan 2 ; Liu, Hongwei 2 ; Jiang, Huidan 1 ;
作者机构： 1.Hunan Acad Agr Sci, Hunan Agr Biotechnol Res Inst, Changsha 410125, Peoples R China
2.Cent South Univ, Minist Educ, Key Lab Biomet, Sch Minerals Proc & Bioengn, Changsha 410083, Peoples R China
关键词： Cadmium; Farmland ecosystem; Bacterial community; Random forest; BugBase
期刊名称：ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY （ 影响因子：7.129； 五年影响因子：7.284 ）
ISSN： 0147-6513
年卷期： 2022 年 229 卷
页码：
收录情况： SCI
摘要： The response of soil bacterial communities from farmland ecosystems to cadmium (Cd) pollution, in which a steep concentration gradient of more than 100 mg/kg has naturally formed, has not previously been fully reported. In this study, a field investigation was conducted in a typical severe Cd-polluted farmland ecosystem, and the bacterial community response to the steep Cd gradient was analyzed. The results showed that Cd concentration sharply decreased from 159.2 mg/kg to 4.18 mg/kg among four sampling sites alongside an irrigation canal over a distance of 150 m. Bacterial diversity and richness were significantly lower in highly polluted sites, and random forest analysis indicated that Cd gradient played a decisive role in reducing alpha diversity. Redundancy analysis (RDA) and co-occurrence network indicated that the synergistic effects of pH, Cd, and phosphorus were the main drivers shaping community structure. The functional results predicted by BugBase suggested that the bacterial community may adapt to the harsh environment by recruiting Cd-resistant microbes and improving oxidative stress tolerance of the whole community. Cd-resistant microorganisms such as Burkholderia, Bradyrhizobium, and Sulfurifustis, which directly or indirectly participate in diminishing oxidative damage of Cd, may play essential roles in maintaining community stability and might be potential bacterial resources for the bioremediation of Cd pollution.
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