Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, School of Environmental Science and Engineering, Nanjing University of Information Science and Technology, Nanjing 210044, China.
Centre of Excellence for Soil Biology, College of Resources and Environment, Southwest University, Chongqing 400715, China; School of Biological Sciences, University of Western Australia, Perth 6009, WA, Australia; Department of Land, Air and Water Resources, University of California at Davis, Davis, CA 95616, USA.
Sci Total Environ. 2023 Apr 15;869:161843. doi: 10.1016/j.scitotenv.2023.161843. Epub 2023 Jan 26.
Effects of elevated CO (eCO) on paddy soil microbial communities remain unclear, particularly when different rice cultivars exposed to eCO. We thus compared responses of soil bacterial communities to ambient CO (aCO) and eCO (aCO + 200 μmol CO mol) between two weakly CO-responsive (Wuyunjing27, W27; Huaidao5, H5) and two strongly CO-responsive rice cultivars (Yongyou1540, Y1540; LongIIyou1988, L1988) throughout six growth stages (early tillering, late tillering, jointing, heading, grain filling and ripening) in a paddy field in Jiangdu, China in 2018. No significant changes in soil bacterial diversities were observed between eCO and aCO or between cultivars for any single growth stage at the OTU level, but α diversity significantly changed at the phylum level except for the ripening stage. For a single cultivar, particularly two strongly CO-responsive cultivars, over their whole growth stage, eCO enhanced differences in bacterial β diversity at both OTU and phylum levels under H5, Y1540 and L1988. Soil bacterial community complexity at the phylum level under eCO was weakened under W27, H5 and Y1540, but enhanced under L1988. eCO-induced changes in soil DOC under these four cultivars had significantly positive impact on bacterial abundances. However, structural equation modeling illustrated that changes in soil DOC induced by eCO significantly decreased soil bacterial community richness. eCO did not significantly affect relationships between soil bacterial community diversities and rice yields, but displayed significantly negative correlations between strongly CO-responsive rice cultivars' yields and relative abundances of Proteobacteria at the ripening stage. Dynamics that how soil microbial communities can differentiate their eCO responses between strongly- and weakly-responsive rice cultivars will provide a new insight into promoting rice productivity and soil health.
大气 CO 浓度升高（eCO）对稻田土壤微生物群落的影响尚不清楚，尤其是当不同的水稻品种暴露于 eCO 时。因此，我们比较了两个弱 CO 响应品种（Wuyunjing27，W27；Huaidao5，H5）和两个强 CO 响应品种（Yongyou1540，Y1540；LongIIyou1988，L1988）的土壤细菌群落对环境 CO（aCO）和 eCO（aCO + 200 μmol CO mol）的响应，整个试验在中国江苏江都的一个稻田中进行，于 2018 年六个生育期（分蘖早期、分蘖后期、拔节期、抽穗期、灌浆期和成熟期）进行采样。在 OTU 水平上，eCO 与 aCO 之间或在任何单一生长阶段，品种之间的土壤细菌多样性均无显著变化，但在门水平上α多样性显著变化，除成熟期外。对于单一品种，特别是两个强 CO 响应品种，在整个生长阶段，eCO 增强了 H5、Y1540 和 L1988 条件下细菌β多样性在 OTU 和门水平上的差异。在 W27、H5 和 Y1540 条件下，eCO 削弱了门水平上土壤细菌群落复杂性，但在 L1988 条件下则增强了。在这四个品种中，eCO 诱导的土壤 DOC 变化对细菌丰度有显著正向影响。然而，结构方程模型表明，eCO 诱导的土壤 DOC 变化显著降低了土壤细菌群落的丰富度。eCO 对土壤细菌多样性和水稻产量之间的关系没有显著影响，但在水稻产量和成熟阶段变形菌相对丰度之间呈显著负相关。eCO 如何在强和弱 CO 响应水稻品种之间使土壤微生物群落对其做出不同的响应，这将为提高水稻生产力和土壤健康提供新的认识。
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