Changes in soil organic matter molecular structure after five-years mimicking climate change scenarios in a Mediterranean savannah

Emeterio, Layla M. San; Morillo, N. T. Jiménez; Pérez-Ramos, Ignacio Manuel; Domínguez, María Teresa; Pérez, José Antonio González

doi:10.1016/j.scitotenv.2022.159288

Cited by 6 publications

(9 citation statements)

References 58 publications

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“…Cropland SOC was of lower quality than hedgerow SOC (e.g., lower O‐alkyl‐C abundances), and characterized by higher structural and thermal stabilities than the later (An et al, 2021). In a Mediterranean silvopastoral system, San‐Emeterio et al (2023) also reported a substantial effect of drought and warming on SOM molecular structure and functioning both under trees and open pastures. However, the open pasture habitat showed a higher sensitivity to drought and warming, pointing to an accelerated SOM degradation.…”

Section: Response Of Agroforestry To Climate Changementioning

confidence: 96%

Agroforestry potential for adaptation to climate change: A soil‐based perspective

Rolo

Rivest

Maillard

et al. 2023

Soil Use and Management

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Agricultural systems face several challenges that threaten their capacity to feed the world while maintaining a healthy and functional environment. Climate change, together with soil degradation, biodiversity loss, resource scarcity and invasive species, is a major threat to agricultural systems worldwide. In this context, new practices have been proposed to circumvent or minimize these threats. Yet, these mostly focus on the farm or plant level (e.g., breeding for stress‐tolerant species), while frequently overlooking belowground components (e.g., soil organic carbon accrual). By interlinking above‐ and below‐ground components, the likelihood of limiting the negative effects of current threats to agricultural systems can be maximized. This review explores current knowledge regarding agroforestry and its effects on belowground components as a key property in the reducing effects of climate change. We first review tree effects on key soil properties of agricultural systems. We synthesize evidence regarding agroforestry systems response to current environmental threats that are related to climate change. We continue by discussing how soil processes play a fundamental role in the capacity of agroforestry systems to cope with climate change. We conclude by proposing options on how resilience of agroforestry systems could be further enhanced.

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Section: Response Of Agroforestry To Climate Changementioning

confidence: 96%

Agroforestry potential for adaptation to climate change: A soil‐based perspective

Rolo

Rivest

Maillard

et al. 2023

Soil Use and Management

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show abstract

“…The identification of specific chromatographic compounds was done by comparing and matching the mass spectra obtained with the Py-CSIA analysis with Py-GC/MS chromatograms obtained using the same pyrolysis and chromatographic conditions. 63 A detailed semiquantitative Py-GC/MS assessment can be found in San-Emeterio et al 19 2.5. Statistical Analysis.…”

Section: Site Descriptionmentioning

confidence: 99%

“…18 As a result, SOM molecular structure and dynamics can differ in the two main habitats of the dehesa: in open grassland and under the tree canopy. 19 This diversity of microhabitats also accounts for relevant soil environmental drivers such as soil temperature and water content and its availability to plants. 20 The study of SOM light elements' stable isotopes can provide information about biomass sources and the prevailing environmental conditions when they were biosynthesized and about processes involved in SOM formation and evolution.…”

Section: Introductionmentioning

confidence: 99%

“…21,39 Uncertainties in the turnover of SOM compounds hinder the implementation of innovative analytical techniques for elucidating this topic. There are several wide fingerprinting tools that could be applied in SOM characterization, such as conventional analytical pyrolysis gas chromatography/mass spectrometry (Py-GC/MS) 19,40 and isotope ratio mass spectrometry (IRMS). 41−43 However, conventional bulk isotopic values are not sufficient to assess SOM changes under the influence of diverse processes.…”

Section: Introductionmentioning

confidence: 99%

“…The tree canopy also indirectly alters the ecosystem functioning, where herbaceous species usually develop morphological and physiological traits that allow them to tolerate the shade and competition caused by trees . As a result, SOM molecular structure and dynamics can differ in the two main habitats of the dehesa : in open grassland and under the tree canopy . This diversity of microhabitats also accounts for relevant soil environmental drivers such as soil temperature and water content and its availability to plants …”

Section: Introductionmentioning

confidence: 99%

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Effects of Climate Change on Soil Organic Matter C and H Isotope Composition in a Mediterranean Savannah (Dehesa): An Assessment Using Py-CSIA

San-Emeterio,

Zavala,

Jiménez-Morillo

et al. 2023

Environ. Sci. Technol.

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Dehesas are Mediterranean agro-sylvo-pastoral systems sensitive to climate change. Extreme climate conditions forecasted for Mediterranean areas may change soil C turnover, which is of relevance for soil biogeochemistry modeling. The effect of climate change on soil organic matter (SOM) is investigated in a field experiment mimicking environmental conditions of global change scenarios (soil temperature increase, +2–3 °C, W; rainfall exclusion, 30%, D; a combination of both, W+D). Pyrolysis-compound-specific isotope analysis (Py-CSIA) is used for C and H isotope characterization of SOM compounds and to forecast trends exerted by the induced climate shift. After 2.5 years, significant δ13C and δ2H isotopic enrichments were detected. Observed short- and mid-chain n-alkane δ13C shifts point to an increased microbial SOM reworking in the W treatment; a 2H enrichment of up to 40‰ of lignin methoxyphenols was found when combining W+D treatments under the tree canopy, probably related to H fractionation due to increased soil water evapotranspiration. Our findings indicate that the effect of the tree canopy drives SOM dynamics in dehesas and that, in the short term, foreseen climate change scenarios will exert changes in the SOM dynamics comprising the biogeochemical C and H cycles.

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Acacia and Eucalyptus plantations modify the molecular composition of density organic matter fractions of subtropical native pasture soils

dos Anjos Leal,

Santana,

Knicker

et al. 2024

Geoderma

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Changes in soil organic matter molecular structure after five-years mimicking climate change scenarios in a Mediterranean savannah

Cited by 6 publications

References 58 publications

Agroforestry potential for adaptation to climate change: A soil‐based perspective

Agroforestry potential for adaptation to climate change: A soil‐based perspective

Effects of Climate Change on Soil Organic Matter C and H Isotope Composition in a Mediterranean Savannah (Dehesa): An Assessment Using Py-CSIA

Acacia and Eucalyptus plantations modify the molecular composition of density organic matter fractions of subtropical native pasture soils

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