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Warming rather than elevated CO 2 shifts the rhizobacterial community composition in four maize‐growing soils
Author(s) -
Fang Rui,
Yu Zhenhua,
Li Yansheng,
Xie Zhihuang,
Wang Guanghua,
Liu Xiaobing,
Liu Junjie,
Liu Judong,
Herbert Stephen J.,
Jin Jian
Publication year - 2021
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.1002/saj2.20217
Subject(s) - rhizosphere , soil water , environmental science , agronomy , microbial population biology , biology , soil science , genetics , bacteria
Abstract Climate change may fundamentally affect the microorganisms in the rhizosphere that drive soil C and nutrient cycles. This study aimed to clarify the response of rhizobacterial community to warming and elevated CO 2 (eCO 2 ) in typical maize ( Zea mays L.)‐growing soils. Under climate change, the shift of rhizobacterial community composition was assumed to be different among soils, which would be associated with the C sequestration and stability in soils. Using open‐top chambers to mimic climate warming and eCO 2 , we examined the taxonomic composition of bacterial communities in the rhizosphere of maize grown in four farming soils (Acrisol, Fluvisol, Kastanozem, and Phaeozem). Warming decreased the richness of the rhizobacterial community by 3.8% across the soils, but eCO 2 did not significantly alter community richness. The shift in bacterial community composition was greater under warming than under eCO 2 , and the shift was different among soils. The abundance of Streptomyces and Gaiella significantly increased in Phaeozem and Acrisol in response to warming but not in Fluvisol or Kastanozem. Sphingomonas was suppressed in Phaeozem under warming, whereas Sphingomonas , Shinella , and Rhodospirillaceae_norank were enriched in the other three soils. Soil chemical characteristics including nitrate, Olsen P, available K, and soil organic C (SOC) were significantly associated with a number of dominant operational taxonomic units. These results indicate that the effect of warming on bacterial community composition in the rhizosphere of maize may be stronger than the effect of eCO 2 . Climate change led to various changes in the rhizobacterial community composition among soils that might be associated with the quality of SOC and nutrient status in different soils.