Effect of repeated soil heating at different temperatures on microbial activity in two burned soils

Lombao, Alba; Barreiro, Ana; Fontúrbel, Teresa; Martín, A.; Carballas, T.; Díaz-Raviña, Montserrat

doi:10.1016/j.scitotenv.2021.149440

Cited by 14 publications

(15 citation statements)

References 106 publications

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“…We found the highest respiration rate at UB followed by the MB, with the lowest respiration at HB (Figure 2B). This is consistent with other literature, showing the sterilizing effects of high frequency fires on microbial respiration (Ajwa et al, 1999; Lombao et al, 2021). Across the first 24 hours after re-wet, the rate of CO 2 produced was greater in the top 10 cm vs. the lowest 10 cm across all cores.…”

Section: Introductionsupporting

confidence: 93%

“…Overall, our results were consistent with literature describing wildfire impacts on soils and provided greater understanding of molecular changes in soil organic matter composition and structure than is possible with typical measurements. In soils with recent fire history, we observed decreases in soil respiration, microbial biomass, and potential enzyme activity (Certini, 2005; Fairbanks et al, 2020; Guénon et al, 2013; Lombao et al, 2021; Neary et al, 2005; Wang et al, 2012). This was associated with shifts in SOM composition, with higher rates of oxidation apparent in surface soils.…”

Section: Introductionmentioning

confidence: 91%

“…Similarly, β-glucosidase potential activity and microbial biomass C and N were highest at UB (SI Figure 1A and Figure 2B respectively). Lower microbial activity at the burned sites may be related to chemical recalcitrance or physical protection of SOM related to the fires (Ajwa et al, 1999; Lombao et al, 2021). For all the sites, respiration increased between 24 and 96 hours in the bottom 10 cm, possibly reflecting less bioavailable SOM in deeper soils than in surface soils (Fang and Moncrieff, 2005).…”

Section: Approachmentioning

confidence: 99%

“…To highlight the power of high-resolution measurements for understanding soil structure, molecular SOM composition, and SOM decomposition, we also present a use case from the 1000 Soils Pilot. Because wildfires are becoming increasingly prevalent worldwide (Abatzoglou and Williams, 2016; Aponte et al, 2016) and have lasting impacts on ecosystem structure and function (Abatzoglou and Williams, 2016; Certini, 2005; Doerr et al, 2006; Lombao et al, 2021; Matosziuk et al, 2020; Neary et al, 2005; Verma and Jayakumar, 2012; Wang et al, 2012), we focus our use case on a set of three locations with varied burned histories. We show that wildfire may result in oxidation of SOM and in structural changes to soil pore networks that persist into deeper soils, which are not investigated by typical sampling schema.…”

Section: Introductionmentioning

confidence: 99%

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One thousand soils for molecular understanding of belowground carbon cycling

Bowman

Heath

Varga

et al. 2022

Preprint

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While significant progress has been made in understanding global carbon (C) cycling, the mechanisms regulating belowground C fluxes and storage are still uncertain. New molecular technologies have the power to elucidate these processes, yet we have no widespread standardized implementation of molecular techniques. To help address this gap, we have developed a crowdsourced soil core research program for analyzing molecular and microstructural data that describe soil structure, soil organic matter (SOM) chemistry, and soil microbiology. Known as the 1,000 Soils Pilot and based at the Environmental Molecular Sciences Laboratory (EMSL), we use Fourier-transform ion cyclotron resonance-(FTICR) and liquid chromatography-(LC) mass spectrometry (MS); X-ray Computed Tomography (XCT), water retention curves; metagenomic sequencing; and standard biogeochemical measurements to enable new insights into soil C cycles. To emphasize cross-site comparability, we provide standardized sampling materials and protocols, and all data are generated on dedicated instruments with optimized settings. Here, we describe the 1000 Soils Pilot and present a use case describing differences in SOM chemistry, soil structure, and chemical and biological properties across forest soils exposed to differing wildfire regimes. Data and analytic workflows from the 1000 Soils Pilot will populate a unique continental-scale database of soil molecular properties, as part of the EMSL Molecular Observation Network (MONet) user program.

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Section: Introductionsupporting

confidence: 93%

Section: Introductionmentioning

confidence: 91%

Section: Approachmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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One thousand soils for molecular understanding of belowground carbon cycling

Bowman

Heath

Varga

et al. 2022

Preprint

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“…In addition, a reduction of soil moisture after re could have caused a negative impact on phosphatase activity. On Monte Pindo, there was more rainfall up to 30 months than from that moment until 42 months after re (Fontúrbel et al, 2016;Lombao et al, 2021; López-Poma and Bautista, 2014). Low phosphatase activity was also observed after 5 years of post-re recovery in burned Mediterranean forests, suggesting that long-term reductions in microorganism enzyme activity may be common, especially after severe re (Moya et al, 2019(Moya et al, , 2018.…”

Section: Discusionmentioning

confidence: 99%

Relationship of chemical and biochemical properties of soil to recurrence and severity of forest fire in South Western European Atlantic environments

Cruz

García-Duro²,

Riveiro³

et al. 2023

Preprint

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Background and aims Changes in fire regimes (extension, severity and recurrence), aggravated by climate change and abandonment of agricultural land, produce a large buildup of fuel in the environment and cause high severity and recurrence of forest fires. Soil can be a good indicator of the effects of fire on the whole ecosystem. The main objective of this study was to identify the effects of the severity and recurrence of fires on chemical and biochemical soil properties in short and medium time and interpret the interaction of plants on these properties. Methods To know the effects of forest fires on soil properties 4 recurrence-severity scenarios were studied at short and medium time after a big forest fire. The analysed properties were pH, %CO, %N, available P, β-glucosidase, urease, phosphatase and microbial biomass C. Results After fire some properties showed a continuous increase throughout the study time (pH, percentage CO, microbial biomass C, β-glucosidase and urease) while other properties (percentage N, available P and phosphatase) experienced a peak at 30 months and then regressed to values at 18 months. Conclusion Forest fire severity strongly modified the chemical and biochemical properties of the soil, favoring the increase of most of them, in some continuously over time and in others punctually. Fire recurrence only had a prominent role in the postfire dynamics of soil pH. The annual changes in soil properties were mainly related to regrowth woody species.

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