Calorimetry and soil

Barros, Nieves; Salgado, Juan José; Feijóo, Sergio

doi:10.1016/j.tca.2007.01.010

Cited by 89 publications

(40 citation statements)

References 73 publications

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“…For station B samples, exothermic peaks appeared, characterizing oxidation of OM and the formation of charcoal (Barros et al 2007). These thermograms exhibited two main exotherms within the 300-320°C and 380-400°C ranges, which indicated the thermal reaction of organic components of increasing thermal stability.…”

Section: Resultsmentioning

confidence: 99%

Organic matter compounds as source indicators and tracers for marine pollution in a western Mediterranean coastal zone

Hedfi

Geffroy-Rodier

Boufahja

et al. 2011

Environ Sci Pollut Res

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Section: Resultsmentioning

confidence: 99%

Organic matter compounds as source indicators and tracers for marine pollution in a western Mediterranean coastal zone

Hedfi

Geffroy-Rodier

Boufahja

et al. 2011

Environ Sci Pollut Res

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“…They fit well with parallel carbon dioxide (CO 2 ) measurements and are sensitive enough to soil perturbation. They also have the advantage of being easily determined by calorimetry, providing an easy interpretation of the results (Barros et al 2007). This was agreed by our observations; Q and k were significantly associated (p < 0.01) to microbial biomass C (0.697, 0.978), N (0.722, 0.968), P (0.612, 0.937), bacteria (0.655, 0.982), fungi (0.650, 0.985) and actinomycetes (0.671 and 0.979 respectively) in Red soil (Table 4).…”

Section: Discussion Microcalorimetric Parameters As Indices Of Soil Mmentioning

confidence: 99%

“…Calorimetry appears to be a useful tool for calculating the latency time, together with the total heat and the kinetics of microbial growth, without any disruption (Barros et al 2007). Our results are in parallel with these findings; in the present study, the microbial activity presented by higher growth rate (k), more peak height (P max ), shorter peak time (t max ) and longer heat dissipation (Q) per cell unit (Tables 5, 6 and 7), indicates that microorganisms under organic treatments (RS or GM) and aerobic conditions at water gradient W1 had more efficient metabolism and growth, while less microbial activity and growth under submerged conditions (W2) and in control treatments were due to lack of aeration, substrate availability and nutrient deficiency.…”

Section: Microcalorimetric Parameters As Influenced By Organic Treatmmentioning

confidence: 99%

Microcalorimetric evaluation of soil microbiological properties under plant residues and dogmatic water gradients in Red soil

Hassan

Chen

Huang

et al. 2013

Soil Science and Plant Nutrition

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A study of 6 months duration was carried out to investigate the effect of water regimes and organic amendments on the soil microbial biomass and microbial population under Red soil collected from Hunan Providence, China. The soil microbial biomass and population were measured with traditional methods and results obtained by conventional methods, corroborated with microcalorimetry. The incorporation of rice (Oryza sativa L.) straw (RS) and green manure (GM), especially at high rates, enhanced the soil microbial activities. We observed that the use of GM exhibited more significant stimulating effects on microbial activities than RS. Similarly, water regimes, 25% (W1) and 200% (W2) of water holding capacity, also had significant effects on microbial activities. Comparing the effects of water levels, we noticed that W2 had a significant negative influence on soil microbial biomass and population. To compare the results of conventional methods and to check the sensitivity of microcalorimetry, the thermodynamic parameters, microbial growth rate constant (k), total heat evolution (Q), peak height (P max ) and peak time (t max ) were calculated. Highest P max, k and Q were observed in GM treatments at water regime W1, while highest t max values were recorded in CK (control) and RS treatments at W2. The microcalorimetric parameters, P max, k and Q were positively correlated, whereas t max negatively linked with microbial biomass and population at p < 0.01. Our results suggest that microcalorimetry successfully verified the results obtained from customary methods and microcalorimetric parameters P max, t max, Q and k proved that they are highly sensitive to microbial properties and could be used as indices of microbial community shifts and activities in soil ecosystems.

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“…High sensitivity calorimeters permit continuous measurements of heat rate without disturbing the living system at a detection level of nanowatts [10]. Biocalorimetry has been widely applied in microbiology and has also been used to monitor SOM biodegradation [11,12]. Calorimeters have steadily improved over the years and now allow simulation of temperature changes from 15 to 100°C while monitoring the microbial response directly.…”

Section: Introductionmentioning

confidence: 99%

Calorimetry measures the response of soil organic matter biodegradation to increasing temperature

Barros

Hansen

Piñeiro

et al. 2015

J Therm Anal Calorim

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The temperature sensitivity of soil organic matter (SOM) is receiving an increasing interest due to its importance in the global carbon cycle and potential feedbacks to climate change. It constitutes a controversial topic in soil science due to different constrains involving the models employed, together with methodological limitations. It is welcome the introduction of new methods and indicators that can assess the sensitivity to temperature of the SOM macromolecule continuum on a more global basis. Calorimetry can be an attractive alternative if the SOM degradation is studied based on the heat rate under a gradient of temperature. The design of new calorimeters permits to do those measurements in real time through a temperature scan mode. We have applied and designed a preliminary protocol with this new type of calorimeters to calculate the activation energies and Q 10 values of soil samples with different recalcitrance. The calculation was run on short-term basis and continuously through a temperature gradient from 18 to 35°C for 1 week. Results showed fast adaptation of microbial decomposition rates to increasing temperature and enough sensitivity of the method to detect changes in the heat rate involving SOM thermal properties. Labile substrates as carbohydrates showed up as potential rulers explaining E a and Q 10 changes which fitted the rule of thumb connecting both.

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Calorimetry and soil

Cited by 89 publications

References 73 publications

Organic matter compounds as source indicators and tracers for marine pollution in a western Mediterranean coastal zone

Organic matter compounds as source indicators and tracers for marine pollution in a western Mediterranean coastal zone

Microcalorimetric evaluation of soil microbiological properties under plant residues and dogmatic water gradients in Red soil

Calorimetry measures the response of soil organic matter biodegradation to increasing temperature

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