Spatial and Temporal Variability of Soil Redox Potential, pH and Electrical Conductivity across a Toposequence in the Savanna of West Africa

Tano, Bernard F.; Brou, Casimir Yao; Dossou-Yovo, Elliott Ronald; Saito, Kazuki; Futakuchi, Koichi; Wopereis, M.C.S.; Husson, Olivier

doi:10.3390/agronomy10111787

Cited by 20 publications

(11 citation statements)

References 29 publications

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“…It is well known that soil CH 4 fluxes are determined by the balance between CH 4 production from methanogens (Christiansen et al, 2015) and CH 4 oxidation from methanotrophs (Prabhu Nath, 2013). The lower soil moisture under warming could lead to higher potential redox conditions, in which microbes degraded SOC by gradually using electron acceptors with higher redox potentials, leading to conditions less suitable for methanogenesis (Johnston et al, 2019; Tano et al, 2020). Meanwhile, soil oxygen content could increase with the decline of soil moisture, resulting in more favorable conditions for methane oxidation (Li et al, 2020).…”

Section: Discussionmentioning

confidence: 99%

Microbially enhanced methane uptake under warming enlarges ecosystem carbon sink in a Tibetan alpine grassland

Zhao

Tian

et al. 2022

Global Change Biology

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The alpine grasslands of the Tibetan Plateau store 23.2 Pg soil organic carbon, which becomes susceptible to microbial degradation with climate warming. However, accurate prediction of how the soil carbon stock changes under future climate warming is hampered by our limited understanding of belowground complex microbial communities. Here, we show that 4 years of warming strongly stimulated methane (CH 4 ) uptake by 93.8% and aerobic respiration (CO 2 ) by 11.3% in the soils of alpine grassland ecosystem. Due to no significant effects of warming on net ecosystem CO 2 exchange (NEE), the warming-stimulated CH 4 uptake enlarged the carbon sink capacity of whole ecosystem. Furthermore, precipitation alternation did not alter such warming effects, despite the significant effects of precipitation on NEE and soil CH 4 fluxes were observed. Metagenomic sequencing revealed that warming led to significant shifts in the overall microbial community structure and the abundances of functional genes, which contrasted to no detectable changes after 2 years of warming. Carbohydrate utilization genes were significantly increased by warming, corresponding with significant increases in soil aerobic respiration. Increased methanotrophic genes and decreased methanogenic genes were observed under warming, which significantly (R 2 = .59, p < .001) correlated with warming-enhanced CH 4 uptakes. Furthermore, 212 metagenome-assembled genomes were recovered, including many populations involved in the degradation of various organic matter and a highly abundant methylotrophic population of the Methyloceanibacter genus. Collectively, our results provide compelling evidence that specific microbial functional traits for CH 4 and CO 2 cycling | 6907 QI et al.

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Section: Discussionmentioning

confidence: 99%

Microbially enhanced methane uptake under warming enlarges ecosystem carbon sink in a Tibetan alpine grassland

Zhao

Tian

et al. 2022

Global Change Biology

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“…Relative abundance of OTUs homologous to T. maxilliforme and T. furcatum increased as soil moisture decreased, which was surprising considering their dual ecology as aquatic taxa. Low soil moisture combined with high pH leads to lower Eh in the soil and results in slower rates of decomposition [ 85 , 86 ]. In addition, high soil moisture and high Eh result in increased reducing conditions that limit extractable P availability in the soil through the solubilisation of Fe oxides that bind to available P [ 87 ].…”

Section: Discussionmentioning

confidence: 99%

Landscape scale ecology of Tetracladium spp. fungal root endophytes

Lazar

Mushinski

Bending

2022

Environmental Microbiome

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Background The genus Tetracladium De Wild. (Ascomycota) has been traditionally regarded as a group of Ingoldian fungi or aquatic hyphomycetes—a polyphyletic group of phylogenetically diverse fungi which grow on decaying leaves and plant litter in streams. Recent sequencing evidence has shown that Tetracladium spp. may also exist as root endophytes in terrestrial environments, and furthermore may have beneficial effects on the health and growth of their host. However, the diversity of Tetracladium spp. communities in terrestrial systems and the factors which shape their distribution are largely unknown. Results Using a fungal community internal transcribed spacer amplicon dataset from 37 UK Brassica napus fields we found that soils contained diverse Tetracladium spp., most of which represent previously uncharacterised clades. The two most abundant operational taxonomic units (OTUs), related to previously described aquatic T. furcatum and T. maxilliforme, were enriched in roots relative to bulk and rhizosphere soil. For both taxa, relative abundance in roots, but not rhizosphere or bulk soil was correlated with B. napus yield. The relative abundance of T. furcatum and T. maxilliforme OTUs across compartments showed very similar responses with respect to agricultural management practices and soil characteristics. The factors shaping the relative abundance of OTUs homologous to T. furcatum and T. maxilliforme OTUs in roots were assessed using linear regression and structural equation modelling. Relative abundance of T. maxilliforme and T. furcatum in roots increased with pH, concentrations of phosphorus, and increased rotation frequency of oilseed rape. It decreased with increased soil water content, concentrations of extractable phosphorus, chromium, and iron. Conclusions The genus Tetracladium as a root colonising endophyte is a diverse and widely distributed part of the oilseed rape microbiome that positively correlates to crop yield. The main drivers of its community composition are crop management practices and soil nutrients.

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“…Relative abundance of both T. maxilliforme and T. furcatum increased as soil moisture decreased, which was surprising considering their dual ecology as aquatic taxa. Low soil moisture combined with high pH leads to lower Eh in the soil and results in slower rates of decomposition [83, 84]. In addition, high soil moisture and high Eh result in increased reducing conditions that limit extractable P availability in the soil through the solubilisation of Fe oxides that bind to available P [85].…”

Section: Discussionmentioning

confidence: 99%

Landscape scale ecology of Tetracladium spp. fungal root endophytes

Lazar

Mushinski

Bending

2022

Preprint

View full text Add to dashboard Cite

BackgroundThe genus Tetracladium has been traditionally regarded as an Ingoldian fungus or aquatic hyphomycete – a group of phylogenetically diverse, polyphyletic fungi which grow on decaying leaves and plant litter in streams. Recent sequencing evidence has shown that Tetracladium spp. may also exist as root endophytes in terrestrial environments, and furthermore may have beneficial effects on the health and growth of their host. However, the diversity of Tetracladium spp. communities in terrestrial systems and the factors which shape their distribution are largely unknown.ResultsUsing a fungal community internal transcribed spacer amplicon dataset from 37 UK Brassica napus fields we found that soils contained diverse Tetracladium spp., most of which represent previously uncharacterised clades. The two most abundant OTUs, related to previously described aquatic T. furcatum and T. maxilliforme, were enriched in roots relative to bulk and rhizosphere soil. For both taxa, relative abundance in roots, but not rhizosphere or bulk soil was correlated with B. napus yield. The relative abundance of T. furcatum and T. maxilliforme OTUs across compartments showed very similar responses with respect to agricultural management practices and soil characteristics. The factors shaping the relative abundance of T. furcatum and T. maxilliforme OTUs in roots was assessed using linear regression and structural equation modelling. Relative abundance of Tetracladium maxilliforme and Tetracladium furcatum in roots increased with pH, concentrations of phosphorus, and increased rotation frequency of OSR. While it decreased with increased soil water content, concentrations of extractable phosphorus, chromium, and iron.ConclusionsThe genus Tetracladium as a root colonising endophyte is a diverse and wildly distributed part of the oilseed rape microbiome that positively correlates to crop yield. The main drivers of its community composition are crop management practices and soil nutrients.

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Spatial and Temporal Variability of Soil Redox Potential, pH and Electrical Conductivity across a Toposequence in the Savanna of West Africa

Cited by 20 publications

References 29 publications

Microbially enhanced methane uptake under warming enlarges ecosystem carbon sink in a Tibetan alpine grassland

Microbially enhanced methane uptake under warming enlarges ecosystem carbon sink in a Tibetan alpine grassland

Landscape scale ecology of Tetracladium spp. fungal root endophytes

Landscape scale ecology of Tetracladium spp. fungal root endophytes

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