The effect of soil moisture on soil microbial activity studied by microcalorimetry

Barros, Nieves; Gómez-Orellana, Isabel; Feijóo, Sergio; Balsa, R.

doi:10.1016/0040-6031(95)90686-x

Cited by 67 publications

(29 citation statements)

References 11 publications

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“…Such response is expressed as the growth rate of the community in response to a carbon source or as the maximum consumption rate of this carbon source. In our study, the calculated apparent growth rates are comparable to growth rates observed in soils (Barros et al, 1995;Parinkina et al, 1973). However, we have to recognize that the temperature in the microcalorimeter was higher than the cave environment, 25 uC instead of 10 uC, which might have led to overestimating these growth rates.…”

Section: Microbiological Activities In Moonmilk Monitored Using Isothsupporting

confidence: 89%

Microbiological activities in moonmilk monitored using isothermal microcalorimetry (Cave of Vers chez le Brandt, Neuchatel, Switzerland)

Braissant¹,

Bindschedler²,

Daniels³

et al. 2012

JCKS

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Studies of the influence of microbial communities on calcium carbonate deposits mostly rely on classical or molecular microbiology, isotopic analyses, and microscopy. Using these techniques, it is difficult to infer microbial activities in such deposits. In this context, we used isothermal microcalorimetry, a sensitive and nondestructive tool, to measure microbial activities associated with moonmilk ex-situ. Upon the addition of diluted LB medium and other carbon sources to fresh moonmilk samples, we estimated the number of colony forming units per gram of moonmilk to be 4.8 3 10 5 6 0.2 3 10 5 . This number was close to the classical plate counts, but one cannot assume that all active cells producing metabolic heat were culturable. Using a similar approach, we estimated the overall growth rate and generation time of the microbial community associated with the moonmilk upon addition of various carbon sources. The range of apparent growth rates of the chemoheterotrophic microbial community observed was between 0.025 and 0.067 h 21 and generation times were between 10 and 27 hours. The highest growth rates were observed for citrate and diluted LB medium, while the highest carbon-source consumption rates were observed for low molecular weight organic acids (oxalate and acetate) and glycerol. Considering the rapid degradation of organic acids, glucose, and other carbon sources observed in the moonmilk, it is obvious that upon addition of nutrients during snow melting or rainfall these communities can have high overall activities comparable to those observed in some soils. Such communities can influence the physico-chemical conditions and participate directly or indirectly to the formation of moonmilk.

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Section: Microbiological Activities In Moonmilk Monitored Using Isothsupporting

confidence: 89%

Microbiological activities in moonmilk monitored using isothermal microcalorimetry (Cave of Vers chez le Brandt, Neuchatel, Switzerland)

Braissant¹,

Bindschedler²,

Daniels³

et al. 2012

JCKS

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“…The highest values (Table 2) found during the simulation for the microbial growth rate (i.e., the rate of increase of microbial biomass) are in agreement with those, between 0.03 and 0.05 h −1 , observed in experiments involving a range of soil microbiota (Barros et al, 1995). Interestingly, the highest values found in the model simulations for the maximum growth rate and for the maximum mortality rate (i.e., the maximum decrease in the number of individuals in an hour) of the microbial population as a whole (Table 2) bear contrasting relationships with their individual counterparts.…”

Section: Microbiological Parameterssupporting

confidence: 73%

Individual-based modelling of carbon and nitrogen dynamics in soils: Parameterization and sensitivity analysis of microbial components

Gras

Gisbert

Valls

et al. 2011

Ecological Modelling

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“…For instance, most of the studies of climate change on soil microbes have concentrated around gross parameters, such as biomass, activity of enzymes, or basic community profiles in relation to single factors of climate (Castro et al 2010). In this regard, it must be mentioned that microcalorimetry is an effective tool to study the effect of moisture on soil microbial activity (Barros et al 1995).…”

Section: Need Of Proper Study and Suggestionsmentioning

confidence: 99%

The microbial aspect of climate change

Dutta

2016

Energ. Ecol. Environ.

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Global warming and climate change are the most prominent issues of the current environmental scenario. These problems arise due to higher concentration of greenhouse gases in the atmosphere which exert a warming effect. Although much attention has been given to anthropogenic sources and impacts of these gases, the significance and implications of microorganisms have remained neglected. The present review brings to light this overlooked aspect (role and responses of microbes in this context) in both terrestrial and aquatic ecosystems. Through existing literature, it attempts to assess the mechanisms that cause microbes to emit and absorb greenhouse gases. The consequent effects as well as feedbacks have also been studied. It was then found that microbes play a major role with respect to climate change. Thus, microbes should never be deprived of their due importance in climate change models as well as discussions on the matter. In addition, the review also identified the necessity of proper research in this aspect as there is a lack of adequate understanding on this facet of climate change.

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The effect of soil moisture on soil microbial activity studied by microcalorimetry

Cited by 67 publications

References 11 publications

Microbiological activities in moonmilk monitored using isothermal microcalorimetry (Cave of Vers chez le Brandt, Neuchatel, Switzerland)

Microbiological activities in moonmilk monitored using isothermal microcalorimetry (Cave of Vers chez le Brandt, Neuchatel, Switzerland)

Individual-based modelling of carbon and nitrogen dynamics in soils: Parameterization and sensitivity analysis of microbial components

The microbial aspect of climate change

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