Dynamics of carbon loss from an Arenosol by a forest to vineyard land use change on a centennial scale

Quero, Solène; Hatté, Christine; Cornu, Sophie; Duvivier, Adrien; Cam, Nithavong; Jamoteau, Floriane; Borschneck, Daniel; Basile‐Doelsch, Isabelle

doi:10.5194/soil-8-517-2022

Cited by 2 publications

(3 citation statements)

References 51 publications

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“…This is also supported by our compartment models (Figure 6). Mineral SOC adsorption may only play a role in arid soils where high‐activity clays are present (Figure 1; Khomo et al., 2017; Quéro et al., 2022), and where higher clay content then leads to higher SOC abundance and persistence (Figure 5).…”

Section: Discussionmentioning

confidence: 99%

Controls and relationships of soil organic carbon abundance and persistence vary across pedo‐climatic regions

von Fromm,

Hoyt,

Sierra

et al. 2024

Global Change Biology

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One of the largest uncertainties in the terrestrial carbon cycle is the timing and magnitude of soil organic carbon (SOC) response to climate and vegetation change. This uncertainty prevents models from adequately capturing SOC dynamics and challenges the assessment of management and climate change effects on soils. Reducing these uncertainties requires simultaneous investigation of factors controlling the amount (SOC abundance) and duration (SOC persistence) of stored C. We present a global synthesis of SOC and radiocarbon profiles (nProfile = 597) to assess the timescales of SOC storage. We use a combination of statistical and depth‐resolved compartment models to explore key factors controlling the relationships between SOC abundance and persistence across pedo‐climatic regions and with soil depth. This allows us to better understand (i) how SOC abundance and persistence covary across pedo‐climatic regions and (ii) how the depth dependence of SOC dynamics relates to climatic and mineralogical controls on SOC abundance and persistence. We show that SOC abundance and persistence are differently related; the controls on these relationships differ substantially between major pedo‐climatic regions and soil depth. For example, large amounts of persistent SOC can reflect climatic constraints on soils (e.g., in tundra/polar regions) or mineral absorption, reflected in slower decomposition and vertical transport rates. In contrast, lower SOC abundance can be found with lower SOC persistence (e.g., in highly weathered tropical soils) or higher SOC persistence (e.g., in drier and less productive regions). We relate variable patterns of SOC abundance and persistence to differences in the processes constraining plant C input, microbial decomposition, vertical C transport and mineral SOC stabilization potential. This process‐oriented grouping of SOC abundance and persistence provides a valuable benchmark for global C models, highlighting that pedo‐climatic boundary conditions are crucial for predicting the effects of climate change and soil management on future C abundance and persistence.

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Section: Discussionmentioning

confidence: 99%

Controls and relationships of soil organic carbon abundance and persistence vary across pedo‐climatic regions

von Fromm,

Hoyt,

Sierra

et al. 2024

Global Change Biology

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“…However, Quéro et al. (2022) showed for plowed Arenosols that the remaining SOC was of microbial origin and stabilized within organo‐mineral associations. Similarly, Khomo et al.…”

Section: Discussionmentioning

confidence: 99%

“…Figures 2b and 3b) and limited microbial C decomposition. However, Quéro et al (2022) showed for plowed Arenosols that the remaining SOC was of microbial origin and stabilized within organo-mineral associations. Similarly, Khomo et al (2017) found for arid soils in South Africa that some SOC was associated with Fe(oxhydr)oxides.…”

Section: Arid Climate Zonesmentioning

confidence: 94%

Controls on timescales of soil organic carbon persistence across sub‐Saharan Africa

von Fromm,

Doetterl,

Butler

et al. 2023

Global Change Biology

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Given the importance of soil for the global carbon cycle, it is essential to understand not only how much carbon soil stores but also how long this carbon persists. Previous studies have shown that the amount and age of soil carbon are strongly affected by the interaction of climate, vegetation, and mineralogy. However, these findings are primarily based on studies from temperate regions and from fine‐scale studies, leaving large knowledge gaps for soils from understudied regions such as sub‐Saharan Africa. In addition, there is a lack of data to validate modeled soil C dynamics at broad scales. Here, we present insights into organic carbon cycling, based on a new broad‐scale radiocarbon and mineral dataset for sub‐Saharan Africa. We found that in moderately weathered soils in seasonal climate zones with poorly crystalline and reactive clay minerals, organic carbon persists longer on average (topsoil: 201 ± 130 years; subsoil: 645 ± 385 years) than in highly weathered soils in humid regions (topsoil: 140 ± 46 years; subsoil: 454 ± 247 years) with less reactive minerals. Soils in arid climate zones (topsoil: 396 ± 339 years; subsoil: 963 ± 669 years) store organic carbon for periods more similar to those in seasonal climate zones, likely reflecting climatic constraints on weathering, carbon inputs and microbial decomposition. These insights into the timescales of organic carbon persistence in soils of sub‐Saharan Africa suggest that a process‐oriented grouping of soils based on pedo‐climatic conditions may be useful to improve predictions of soil responses to climate change at broader scales.

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Dynamics of carbon loss from an Arenosol by a forest to vineyard land use change on a centennial scale

Cited by 2 publications

References 51 publications

Controls and relationships of soil organic carbon abundance and persistence vary across pedo‐climatic regions

Controls and relationships of soil organic carbon abundance and persistence vary across pedo‐climatic regions

Controls on timescales of soil organic carbon persistence across sub‐Saharan Africa

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