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ABSTRACT: Bacteria in degraded grassland with low nitrogen application

PROVIDER: PRJNA1091576 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR28475174.fastq.gz	Fastqsanger.gz
	SRR28475175.fastq.gz	Fastqsanger.gz
	SRR28475176.fastq.gz	Fastqsanger.gz
	SRR28475177.fastq.gz	Fastqsanger.gz
	SRR28475178.fastq.gz	Fastqsanger.gz

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Project description:To study whether and how soil nitrogen conditions affect the ecological effects of long-term elevated CO2 on microbial community and soil ecoprocess, here we investigated soil microbial community in a grassland ecosystem subjected to ambient CO2 (aCO2, 368 ppm), elevated CO2 (eCO2, 560 ppm), ambient nitrogen deposition (aN) or elevated nitrogen deposition (eN) treatments for a decade. Under the aN condition, a majority of microbial function genes, as measured by GeoChip 4.0, were increased in relative abundance or remained unchanged by eCO2. Under the eN condition, most of functional genes associated with carbon, nitrogen and sulfur cycling, energy processes, organic remediation and stress responses were decreased or remained unchanged by eCO2, while genes associated with antibiotics and metal resistance were increased. The eCO2 effects on fungi and archaea were largely similar under both nitrogen conditions, but differed substantially for bacteria. Coupling of microbial carbon or nitrogen cycling genes, represented by positive percentage and density of gene interaction in association networks, was higher under the aN condition. In accordance, changes of soil CO2 flux, net N mineralization, ammonification and nitrification was higher under the aN condition. Collectively, these results demonstrated that eCO2 effects are contingent on nitrogen conditions, underscoring the difficulty toward predictive modeling of soil ecosystem and ecoprocesses under future climate scenarios and necessitating more detailed studies.

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Project description:Soil microorganisms in saline-alkali degraded grassland.

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