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首页> 外文期刊>Soil Biology & Biochemistry >Microbial communities in rice rhizosphere altered by intermittent and continuous flooding in fields with long-term arsenic application
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Microbial communities in rice rhizosphere altered by intermittent and continuous flooding in fields with long-term arsenic application

机译：长期施用砷的田间断续连续注水改变水稻根际微生物群落

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Rice cultivated on arsenic (As)-contaminated soils can, under some conditions, accumulate high concentrations of As in grain, mostly as a result of the continuous flooding practices commonly used for rice cultivation. Intermittent flooding, as opposed to continuous flooding, might reduce soluble As concentrations in the rice rhizosphere, but it might also alter soil microbial populations that may impact As chemistry. A field-scale study was conducted to analyze As concentrations and microbial populations in the rice rhizosphere, in response to intermittent and continuous flooding in plots that were historically amended with "As-containing" pesticide and unamended soil. Rhizosphere, pore-water and grain As concentrations were quantified, and microbial populations in the rhizosphere were characterized using community quantitative-PCR and 16S rRNA gene sequencing. Pore-water As concentrations decreased by 41-81% and grain As by 31-48% in the intermittently flooded plots relative to the continuously flooded plots. The relative abundance of bacteria increased over the course of the growing season, while archaeal and fungal gene abundances decreased. Bacterial community structure and composition were significantly different between As amended and unamended plots, as well as between the flooding treatments. Proteobacteria was the predominant phylum detected in most treatments with relative abundance of 24-29%. The relative abundance of iron-reducing bacteria was higher with the continuous flood compared to the intermittent-flood treatment, implying greater relative iron reduction and possibly As release from the iron oxides under the continuously flooded conditions. These differences in rhizosphere-microbial communities may have contributed to the lower pore-water arsenic concentrations in the intermittently flooded conditions.
机译：在某些条件下，在砷（As）污染的土壤上种植的水稻可能会在谷物中积累高浓度的As，这主要是由于水稻种植通常采用的连续驱水措施造成的。与连续洪水不同，间歇性洪水可能会降低水稻根际中可溶性As的浓度，但也可能改变土壤微生物种群，从而可能影响As化学。进行了田间规模的研究，以分析水稻根际中的砷浓度和微生物种群，以应对历史上曾用“含砷”农药和未改良土壤改良的地块的间歇性和连续性洪水。定量根际，孔隙水和谷物中的As浓度，并使用社区定量PCR和16S rRNA基因测序来表征根际中的微生物种群。与连续淹水区相比，间歇性淹水区的孔隙水As浓度降低了41-81％，谷物As降低了31-48％。细菌的相对丰度在生长季节过程中增加，而古细菌和真菌基因的丰度降低。修正后的地块和未修正地块之间以及洪水处理之间的细菌群落结构和组成均存在显着差异。蛋白质细菌是大多数治疗中检出的主要菌门，相对丰度为24-29％。与间歇性淹水处理相比，连续性淹水时还原铁细菌的相对丰度更高，这意味着在连续淹水条件下铁的相对铁还原量更大，并且可能从氧化铁中释放出As。在间歇性淹没条件下，根际微生物群落的这些差异可能导致较低的孔隙水砷浓度。

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