Tradeoffs in microbial carbon allocation may mediate soil carbon storage in future climates

Kivlin, Stephanie N.; Waring, Bonnie G.; Averill, Colin; Hawkes, Christine V.

doi:10.3389/fmicb.2013.00261

Cited by 12 publications

(11 citation statements)

References 28 publications

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“…Higher CUE can augment soil C storage by increasing the amount of C retained in the soil, whereas higher biomass may increase overall carbon processing. Here, we observed that increases in the amount or C content of the microbial biomass enhanced soil C loss in the ramp treatment, probably by increasing overall enzyme production (Allison et al, 2010;Kivlin et al, 2013;Manzoni et al, 2012). Alternatively, nutrient limitation in microbial biomass owing to the greater incorporation of C in biomass in the ramp treatment could also increase C loss through overflow respiration (Franklin, Hall, Kaiser, Battin, & Richter, 2011;Russell & Cook, 1995).…”

Section: Discussionmentioning

confidence: 71%

“…Soil organic C decomposition, CUE and CUE acclimation can create feedbacks loops. For example, lower CUE may lead to a decline in microbial biomass and degradative enzymes and curbing of soil C losses under warming (Allison et al, 2010;Kivlin, Waring, Averill, & Hawkes, 2013;Schimel, 2013). Thus, microbial adaptation could accelerate soil C loss by counteracting the decline in microbial biomass from an upward adjustment in CUE (i.e., acclimation).…”

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confidence: 99%

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Rate of warming affects temperature sensitivity of anaerobic peat decomposition and greenhouse gas production

Sihi

Inglett

Gerber

et al. 2017

Global Change Biology

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Temperature sensitivity of anaerobic carbon mineralization in wetlands remains poorly represented in most climate models and is especially unconstrained for warmer subtropical and tropical systems which account for a large proportion of global methane emissions. Several studies of experimental warming have documented thermal acclimation of soil respiration involving adjustments in microbial physiology or carbon use efficiency (CUE), with an initial decline in CUE with warming followed by a partial recovery in CUE at a later stage. The variable CUE implies that the rate of warming may impact microbial acclimation and the rate of carbon-dioxide (CO 2 ) and methane (CH 4 ) production. Here, we assessed the effects of warming rate on the decomposition of subtropical peats, by applying either a large single-step (10°C within a day) or a slow ramping (0.1°C/day for 100 days) temperature increase. The extent of thermal acclimation was tested by monitoring CO 2 and CH 4 production, CUE, and microbial biomass. Total gaseous C loss, CUE, and MBC were greater in the slow (ramp) warming treatment. However, greater values of

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Section: Discussionmentioning

confidence: 71%

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confidence: 99%

Rate of warming affects temperature sensitivity of anaerobic peat decomposition and greenhouse gas production

Sihi

Inglett

Gerber

et al. 2017

Global Change Biology

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“…However, the decrease in microbial biomass‐N during drought in permanent intensive grasslands was not associated with a change in soil N processes, which remained stable (Figure ). This suggests that the resistant part of microbial communities maintained N‐cycling levels through higher activity per unit of biomass (selection of oligotrophic microbes during drought) or that slow enzymes turnover in dry conditions maintained enzyme activity after the death of their producers (Kivlin, Waring, Averill, & Hawkes, ; Steinweg, Dukes, & Wallenstein, ).…”

Section: Discussionmentioning

confidence: 99%

Using proxies of microbial community‐weighted means traits to explain the cascading effect of management intensity, soil and plant traits on ecosystem resilience in mountain grasslands

et al. 2020

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1. Trait-based approaches provide a framework to understand the role of functional biodiversity on ecosystem functioning under global change. While plant traits have been reported as potential drivers of soil microbial community composition and resilience, studies directly assessing microbial traits are scarce, limiting our mechanistic understanding of ecosystem functioning.2. We used microbial biomass and enzyme stoichiometry, and mass-specific enzymes activity as proxies of microbial community-weighted mean (CWM) traits, to infer trade-offs in microbial strategies of resource use with cascading effects on ecosystem resilience. We simulated a drought event on intact plant-soil mesocosms extracted from mountain grasslands along a management intensity gradient.Ecosystem processes and properties related to nitrogen cycling were quantified before, during and after drought to characterize ecosystem resilience.3. Soil microbial CWM traits and ecosystem resilience to drought were strongly influenced by grassland type. Structural equation modelling revealed a cascading effect from management to ecosystem resilience through modifications in soil nutrients, and plant and microbial CWM traits. Overall, our results depict a shift from high investment in extracellular enzymes in nutrient-poor soils (oligotrophic strategy), to a copiotrophic strategy with low microbial biomass N:P and low investment in extracellular enzymes associated with exploitative plant traits in nutrient-rich soils.4. Microbial CWM traits responses to management intensity were highly related to ecosystem resilience. Microbial communities with a copiotrophic strategy had lower resistance but higher recovery to drought, while microbial communities with an oligotrophic strategy showed the opposite responses. The unexpected trade-off between plant and microbial resistance suggested that the lower resistance of copiotrophic microbial communities enabled plant resistance to drought. Synthesis.Grassland management has cascading effects on ecosystem resilience through its combined effects on soil nutrients and plant traits propagating to microbial traits and resilience. We suggest that intensification of permanent grassland management and associated increases in soil nutrient availability decreased | 877 Journal of Ecology PITON eT al. S U PP O RTI N G I N FO R M ATI O N Additional supporting information may be found online in the Supporting Information section. How to cite this article: Piton G, Legay N, Arnoldi C, Lavorel S, Clément J-C, Foulquier A. Using proxies of microbial community-weighted means traits to explain the cascading effect of management intensity, soil and plant traits on ecosystem resilience in mountain grasslands.

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“…Despite recent evidence showing that higher microbial growth rate and efficiency can increase C storage in agricultural soils (Kallenbach et al, 2015) and in grassland soils (Poeplau et al, 2019), there still remains great uncertainty regarding how and in which directions these traits will impact SOC pools (Anthony et al, 2020;Malik et al, 2020). For example, higher microbial growth efficiency can augment SOC storage by increasing the amount of C from soil microbial biomass and ultimately necromass, while increased microbial biomass C may also enhance production of Cdegrading enzymes leading to decreased soil C stocks (Kivlin et al, 2013). The impacts of microbial physiological traits on SOC dynamics can also vary at multiple ecological scales (Geyer et al, 2016).…”

Section: Microbial Physiologymentioning

confidence: 99%

Soil microbial carbon pump: Mechanism and appraisal

Liang

2020

Soil Ecol. Lett.

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The soil microbial carbon pump (MCP) conceptualizes a sequestration mechanism based on the process of microbial production of a set of new organic compounds, which carry the carbon from plant, through microbial anabolism, and enter into soil where it can be stabilized by the entombing effect. Understanding soil MCP and its related entombing effect is essential to the stewardship of ecosystem services, provided by microbial necromass in the formation and stabilization of soil organic matter as well as its resilience and vulnerability to global change. The mechanism and appraisal of soil MCP, however, remain to be elucidated. This lack of knowledge hampers the improvement of climate models and the development of land use policies. Here, I overview available knowledge to provide insights on the nature of the soil MCP in the context of two main aspects, i.e., internal features and external constraints that mechanistically influence the soil MCP operation and ultimately influence microbial necromass dynamics. The approach of biomarker amino sugars for investigation of microbial necromass and the methodological limitations are discussed. Finally, I am eager to call new investigations to obtain empirical data in soil microbial necromass research area, which urgently awaits synthesized quantitative and modeling studies to relate to soil carbon cycling and climate change.

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Tradeoffs in microbial carbon allocation may mediate soil carbon storage in future climates

Cited by 12 publications

References 28 publications

Rate of warming affects temperature sensitivity of anaerobic peat decomposition and greenhouse gas production

Rate of warming affects temperature sensitivity of anaerobic peat decomposition and greenhouse gas production

Using proxies of microbial community‐weighted means traits to explain the cascading effect of management intensity, soil and plant traits on ecosystem resilience in mountain grasslands

Soil microbial carbon pump: Mechanism and appraisal

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