Land use driven change in soil pH affects microbial carbon cycling processes

Nature Communications, Journal Year: 2018, Volume and Issue: 9(1)

Published: Aug. 29, 2018

Abstract Soil microorganisms act as gatekeepers for soil–atmosphere carbon exchange by balancing the accumulation and release of soil organic matter. However, poor understanding mechanisms responsible hinders development effective land management strategies to enhance storage. Here we empirically test link between microbial ecophysiological traits topsoil content across geographically distributed soils use contrasts. We discovered distinct pH controls on accumulation. Land intensification in low-pH that increased above a threshold (~6.2) leads loss through decomposition, following alleviation acid retardation growth. with near-neutral was linked decreased biomass reduced growth efficiency was, turn, related trade-offs stress resource acquisition. Thus, less-intensive practices have more potential storage efficiency, whereas acidic soils, is bigger constraint decomposition rates.

Language: Английский

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The nature and dynamics of soil organic matter: Plant inputs, microbial transformations, and organic matter stabilization

Soil Biology and Biochemistry, Journal Year: 2016, Volume and Issue: 98, P. 109 - 126

Published: April 17, 2016

Language: Английский

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Microbial carbon use efficiency promotes global soil carbon storage

Nature, Journal Year: 2023, Volume and Issue: 618(7967), P. 981 - 985

Published: May 24, 2023

Abstract Soils store more carbon than other terrestrial ecosystems 1,2 . How soil organic (SOC) forms and persists remains uncertain 1,3 , which makes it challenging to understand how will respond climatic change 3,4 It has been suggested that microorganisms play an important role in SOC formation, preservation loss 5–7 Although affect the accumulation of matter through many pathways 4,6,8–11 microbial use efficiency (CUE) is integrative metric can capture balance these processes 12,13 CUE potential act as a predictor variation storage, persistence unresolved 7,14,15 Here we examine relationship between SOC, interactions with climate, vegetation edaphic properties, using combination global-scale datasets, microbial-process explicit model, data assimilation, deep learning meta-analysis. We find at least four times evaluated factors, such input, decomposition or vertical transport, determining storage its spatial across globe. In addition, shows positive correlation content. Our findings point major determinant global storage. Understanding underlying their environmental dependence may help prediction feedback changing climate.

Language: Английский

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Minerals in the rhizosphere: overlooked mediators of soil nitrogen availability to plants and microbes

Biogeochemistry, Journal Year: 2018, Volume and Issue: 139(2), P. 103 - 122

Published: June 7, 2018

Despite decades of research progress, ecologists are still debating which pools and fluxes provide nitrogen (N) to plants soil microbes across different ecosystems. Depolymerization organic N is recognized as the rate-limiting step in production bioavailable N, it generally assumed that detrital main source. However, many mineral soils, polymers constitute a minor fraction total N. The majority associated with clay-sized particles where physicochemical interactions may limit accessibility N-containing compounds. Although mineral-associated matter (MAOM) has historically been considered critical, but relatively passive, reservoir growing body now points dynamic nature mineral-organic associations their potential for destabilization. Here we synthesize evidence from biogeoscience ecology demonstrate how MAOM an important, yet overlooked, mediator especially rhizosphere. We highlight several biochemical strategies enable disrupt access MAOM. In particular, root-deposited low-molecular-weight exudates enhance mobilization solubilization MAOM, increasing its bioavailability. competitive balance between possible fates monomers—bound surfaces versus dissolved available assimilation—will depend on specific interaction properties, solution, mineral-bound matter, microbes. Building off our emerging understanding source propose revision Schimel Bennett (Ecology 85:591–602, 2004) model (which emphasizes depolymerization), by incorporating proximal

Language: Английский

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Microbial growth and carbon use efficiency in soil: Links to fungal-bacterial dominance, SOC-quality and stoichiometry

Soil Biology and Biochemistry, Journal Year: 2019, Volume and Issue: 131, P. 195 - 205

Published: Jan. 14, 2019

Language: Английский

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Blind spots in global soil biodiversity and ecosystem function research

Nature Communications, Journal Year: 2020, Volume and Issue: 11(1)

Published: Aug. 3, 2020

Soils harbor a substantial fraction of the world's biodiversity, contributing to many crucial ecosystem functions. It is thus essential identify general macroecological patterns related distribution and functioning soil organisms support their conservation consideration by governance. These analyses need represent diversity environmental conditions that can be found worldwide. Here we characterize existing gaps in taxa data across studies 17,186 sampling sites globe. include important spatial, environmental, taxonomic, functional gaps, an almost complete absence temporally explicit data. We also limitations explore biodiversity-ecosystem relationships, with only 0.3% all having both information about biodiversity function, although different taxonomic groups functions at each site. Based on this information, provide clear priorities expand research. Soil organism contributes but function have not been equivalently studied authors locations, environment types, for which there currently lack literature.

Language: Английский

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Clarifying the interpretation of carbon use efficiency in soil through methods comparison

Soil Biology and Biochemistry, Journal Year: 2018, Volume and Issue: 128, P. 79 - 88

Published: Oct. 9, 2018

Accurate estimates of microbial carbon use efficiency (CUE) are required to predict how global change will impact microbially-mediated ecosystem functions such as organic matter decomposition. Multiple approaches currently used quantify CUE but the extent which reflect methodological variability is unknown. This limits our ability apply or cross-compare published values. Here we evaluated performance five methods in a single soil under standard conditions. The response three substrate amendment rates (0.0, 0.05, and 2.0 mg glucose-C g−1 soil) was examined using: 13C 18O isotope tracing estimate based on uptake growth dynamics; calorespirometry infers from metabolic heat respiration rates; flux analysis where determined balance between biosynthesis using position-specific 13CO2 production labeled glucose; stoichiometric modeling derives elemental ratios biomass, substrate, exoenzyme activity. obtained differed by method concentration, ranging situ conditions <0.4 for substrate-nonspecific that do not C tracers (18O, modeling) >0.6 substrate-specific trace glucose (13C method, calorespirometry, analysis). We explore different aspects metabolism each captures this affects interpretation estimates. recommend users consider strengths weaknesses when choosing technique best address their research needs.

Language: Английский

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Nitrogen availability regulates topsoil carbon dynamics after permafrost thaw by altering microbial metabolic efficiency

Nature Communications, Journal Year: 2018, Volume and Issue: 9(1)

Published: Sept. 21, 2018

Input of labile carbon may accelerate the decomposition existing soil organic matter (priming effect), with priming intensity depending on changes in nitrogen availability after permafrost thaw. However, experimental evidence for linkage between effect and post-thaw is unavailable. Here we test hypothesis that elevated collapse inhibits by increasing microbial metabolic efficiency based a combination thermokarst-induced natural gradient addition experiment. We find negative correlation total dissolved concentration along thaw sequence. The confirmed reduced addition. In contrast to prevailing view, this nitrogen-regulated independent extracellular enzyme activities but associated efficiency. These findings demonstrate regulates topsoil dynamics through its modification

Language: Английский

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Soil carbon loss by experimental warming in a tropical forest

Nature, Journal Year: 2020, Volume and Issue: 584(7820), P. 234 - 237

Published: Aug. 12, 2020

Language: Английский

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Impacts of biodegradable plastic mulches on soil health

Agriculture Ecosystems & Environment, Journal Year: 2018, Volume and Issue: 273, P. 36 - 49

Published: Dec. 14, 2018

Language: Английский

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