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Soil

ABSTRACT: The microbial mechanism of soil greenhouse gas emissions under long-term conservation tillage in dryland (Soil Metagenome)

PROVIDER: PRJNA641749 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR12095321_1.fastq.gz	Fastqsanger.gz
	SRR12095321_2.fastq.gz	Fastqsanger.gz
	SRR12095322_1.fastq.gz	Fastqsanger.gz
	SRR12095322_2.fastq.gz	Fastqsanger.gz
	SRR12095323_1.fastq.gz	Fastqsanger.gz

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Project description:The microbial mechanism of soil greenhouse gas emissions under long-term conservation tillage in dryland

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Project description:Raw sequence reads: The microbial mechanism of soil greenhouse gas emissions under long-term conservation tillage in dryland (Soil denitrifying microbial communities)

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The microbial functional diversity in response to altered precipitation on Tibet Plateau as characterized by GeoChip

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Wetland soil incubation treated with sulfate and oxygen

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Differences in major bacterial taxa in three high Arctic soils lead to different CO2 production rates

Project description:The melting of permafrost and its potential impact on greenhouse gas emissions is a major concern in the context of global warming. The fate of the carbon trapped in permafrost will largely depend on soil physico-chemical characteristics, among which are the quality and quantity of organic matter, pH and water content, and on microbial community composition. In this study, we used microarrays and real-time PCR (qPCR) targeting 16S rRNA genes to characterize the bacterial communities in three different soil types representative of various Arctic settings. The microbiological data were linked to soil physico-chemical characteristics and CO2 production rates. Microarray results indicated that soil characteristics, and especially the soil pH, were important parameters in structuring the bacterial communities at the genera/species levels. Shifts in community structure were also visible at the phyla/class levels, with the soil CO2 production rate being positively correlated to the relative abundance of the Alphaproteobacteria, Bacteroidetes, and Betaproteobacteria. These results indicate that CO2 production in Arctic soils does not only depend on the environmental conditions, but also on the presence of specific groups of bacteria that have the capacity to actively degrade soil carbon.

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Project description:The fate of the carbon stocked in permafrost soils following global warming and permafrost thaw is of major concern in view of the potential for increased CH4 and CO2 emissions from these soils. Complex carbon compound degradation and greenhouse gas emissions are due to soil microbial communities, but their composition and functional potential in permafrost soils are largely unknown. Here, a 2 m deep permafrost and its overlying active layer soil were subjected to metagenome sequencing, quantitative PCR, and microarray analyses. The active layer soil and 2 m permafrost soil microbial community structures were very similar, with Actinobacteria being the dominant phylum. The two soils also possessed a highly similar spectrum of functional genes, especially when compared to other already published metagenomes. Key genes related to methane generation, methane oxidation and organic matter degradation were highly diverse for both soils in the metagenomic libraries and some (e.g. pmoA) showed relatively high abundance in qPCR assays. Genes related to nitrogen fixation and ammonia oxidation, which could have important roles following climatic change in these nitrogen-limited environments, showed low diversity but high abundance. The 2 m permafrost soil showed lower abundance and diversity for all the assessed genes and taxa. Experimental biases were also evaluated and showed that the whole community genome amplification technique used caused large representational biases in the metagenomic libraries. This study described for the first time the detailed functional potential of permafrost-affected soils and detected several genes and microorganisms that could have crucial importance following permafrost thaw.

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