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- W3155776726 abstract "Soil respiration (RS) is one of the most important carbon fluxes in terrestrial ecosystems, and it is considered as a keystone in predicting ecosystem functioning. Changes in climate and land use may alter RS, triggering feedbacks between RS and other ecosystem components. Different factors might simultaneously alter RS, but the consequences of the interactive effects for ecosystems functioning remain poorly understood. Here, the impact of the expected changes in climate were analysed in a factorial field study over two consecutive years in a Mediterranean savannah ecosystem. We assessed how the interaction of changes in climate with grazing legacy and habitat structure influences RS. We simulated different climate scenarios (ambient, drier, warmer, and drier and warmer conditions) forecasted for the study area at three adjacent sites with different grazing legacies (high, medium, and low) and for the two most important habitat types (open grasslands and under tree canopy). We also considered other factors that could affect RS, such as soil organic C, microbial biomass or net primary productivity, unravelling the direct and indirect effects of the factors controlling RS over time by using structural-equation models (SEMs). Overall, RS was higher under tree canopy than in open grasslands, and high grazing intensity tended to alter RS differently through seasons. Warming scenario consistently increased RS, while drought reduced it (especially in moist seasons), with a moderate increase of RS resulting from the combination of warming and drought. Tree canopy modulated the impact of climate on RS. The SEM analyses identified soil moisture, temperature, grazing legacy and canopy as the main factors controlling RS, although they presented seasonal variations in the size and direction of their effects. Thus, the projected changes in climate can deeply alter ecosystem functioning of carbon sequestration, although their impact can be modulated by canopy cover and management activities." @default.
- W3155776726 created "2021-04-26" @default.
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- W3155776726 date "2021-07-01" @default.
- W3155776726 modified "2023-10-14" @default.
- W3155776726 title "How will forecasted warming and drought affect soil respiration in savannah ecosystems? The role of tree canopy and grazing legacy" @default.
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- W3155776726 doi "https://doi.org/10.1016/j.agrformet.2021.108425" @default.
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