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Response of soil bacterial community and geochemical parameters to cyclic groundwater‐level oscillations in laboratory columns
Vadose Zone Journal ( IF 2.8 ) Pub Date : 2020-03-05 , DOI: 10.1002/vzj2.20011 Xuefeng Xia 1, 2, 3 , Lirong Cheng 1, 2, 3 , Yi Zhu 1, 2, 3 , Yueqiao Liu 1, 2, 3 , Kai Wang 1, 2, 3 , Aizhong Ding 1, 2, 3 , Zuansi Cai 4 , Huansheng Shi 5 , Lili Zuo 5
Vadose Zone Journal ( IF 2.8 ) Pub Date : 2020-03-05 , DOI: 10.1002/vzj2.20011 Xuefeng Xia 1, 2, 3 , Lirong Cheng 1, 2, 3 , Yi Zhu 1, 2, 3 , Yueqiao Liu 1, 2, 3 , Kai Wang 1, 2, 3 , Aizhong Ding 1, 2, 3 , Zuansi Cai 4 , Huansheng Shi 5 , Lili Zuo 5
Affiliation
Groundwater‐level oscillations change geochemical conditions, C cycling processes, and bacterial community composition, and these changes may vary vertically with depth in a soil. In this study, soil column experiments were conducted to explore variations in soil bacterial community composition and its associated geochemical parameters to rapid short‐term cyclic groundwater‐level oscillations driven by natural fluctuations (NF) and rainfall infiltration (RI), and the results are compared with a quasistatic (QS) column. Water saturation patterns in vadose and oscillated zones, and O2 level patterns, soil total organic C (TOC) removal rates, and soil bacterial community composition in vadose, oscillated, and saturated zones were evaluated. Results showed that water saturation and O2 level oscillated with groundwater level in NF and RI columns. Total organic C removal rates in RI column were the highest across vadose (∼38.4%), oscillated (∼35.8%), and saturated (∼35.2%) zones. Deltaproteobacteria, which were significantly correlated with TOC removal (p < .05), were found in higher abundance in the vadose and oscillated zones of the RI column than in the QS and NF columns. Soil bacterial community structure was dynamic at the class level due to water saturation, O2 level, and TOC removal. Total organic C removal was the driver to separate the distribution of bacterial community structure in the vadose and oscillated zones of the RI column from those of the QS and NF columns. This study suggests that RI induced rapid, short‐term, cyclic, groundwater‐level oscillations could significantly influence both the soil C cycle and bacterial community structure in the vadose and oscillated zones.
中文翻译：
实验室柱中土壤细菌群落和地球化学参数对地下水位循环振荡的响应
地下水位的振荡会改变地球化学条件，碳循环过程和细菌群落组成，并且这些变化可能会随着土壤深度的变化而垂直变化。在这项研究中，进行了土壤柱实验，以探索土壤细菌群落组成及其相关地球化学参数的变化，这些变化是由自然波动（NF）和降雨入渗（RI）驱动的短期短期地下水位循环振荡的结果。与准静态（QS）列进行比较。评估了渗流区和振荡区的水饱和度模式，以及渗流区，振荡区和饱和区的O 2水平模式，土壤总有机碳（TOC）去除率以及土壤细菌群落组成。结果表明水饱和度和O 2NF和RI列中的水位与地下水位一起振荡。RI柱中的总有机碳去除率在渗流区（〜38.4％），振荡区（〜35.8％）和饱和区（〜35.2％）中最高。 与RI柱的渗流区和振荡区相比，与TOC去除率显着相关的Deltaproteobacteria（p <.05）要多于QS和NF柱。由于水饱和度O 2的影响，土壤细菌群落结构在全班水平上是动态的级别和TOC删除。总有机碳去除是将RI柱渗流区和振荡区中细菌群落结构的分布与QS和NF柱分离的驱动力。这项研究表明，RI引起的快速，短期，周期性，地下水位振荡可能显着影响渗流区和振荡区的土壤碳循环和细菌群落结构。
更新日期：2020-03-05
中文翻译：
实验室柱中土壤细菌群落和地球化学参数对地下水位循环振荡的响应
地下水位的振荡会改变地球化学条件，碳循环过程和细菌群落组成，并且这些变化可能会随着土壤深度的变化而垂直变化。在这项研究中，进行了土壤柱实验，以探索土壤细菌群落组成及其相关地球化学参数的变化，这些变化是由自然波动（NF）和降雨入渗（RI）驱动的短期短期地下水位循环振荡的结果。与准静态（QS）列进行比较。评估了渗流区和振荡区的水饱和度模式，以及渗流区，振荡区和饱和区的O 2水平模式，土壤总有机碳（TOC）去除率以及土壤细菌群落组成。结果表明水饱和度和O 2NF和RI列中的水位与地下水位一起振荡。RI柱中的总有机碳去除率在渗流区（〜38.4％），振荡区（〜35.8％）和饱和区（〜35.2％）中最高。 与RI柱的渗流区和振荡区相比，与TOC去除率显着相关的Deltaproteobacteria（p <.05）要多于QS和NF柱。由于水饱和度O 2的影响，土壤细菌群落结构在全班水平上是动态的级别和TOC删除。总有机碳去除是将RI柱渗流区和振荡区中细菌群落结构的分布与QS和NF柱分离的驱动力。这项研究表明，RI引起的快速，短期，周期性，地下水位振荡可能显着影响渗流区和振荡区的土壤碳循环和细菌群落结构。
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