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  • Title: Silvopastoral systems and remnant forests enhance carbon storage in livestock-dominated landscapes in Mexico.
    Author: Aryal DR, Morales-Ruiz DE, López-Cruz S, Tondopó-Marroquín CN, Lara-Nucamendi A, Jiménez-Trujillo JA, Pérez-Sánchez E, Betanzos-Simon JE, Casasola-Coto F, Martínez-Salinas A, Sepúlveda-López CJ, Ramírez-Díaz R, La O Arias MA, Guevara-Hernández F, Pinto-Ruiz R, Ibrahim M.
    Journal: Sci Rep; 2022 Oct 06; 12(1):16769. PubMed ID: 36202891.
    Abstract:
    A large area of the terrestrial land surface is used for livestock grazing. Trees on grazing lands provide and can enhance multiple ecosystem services such as provisioning, cultural and regulating, that include carbon sequestration. In this study, we assessed the above- and belowground carbon stocks across six different land-uses in livestock-dominated landscapes of Mexico. We measured tree biomass and soil organic carbon (SOC) stocks in fodder banks, live fences, pasturelands with dispersed trees, secondary forests, and primary forests from three different geographical regions and compared them with conventional open pasturelands respectively. We also calculated tree diversity indices for each land-use and their similarity with native primary forests. The aboveground woody biomass stocks differed significantly between land-uses and followed the gradient from less diverse conventional open pasturelands to silvopastoral systems and ecologically complex primary forests. The SOC stocks showed a differential response to the land-use gradient dependent on the study region. Multivariate analyses showed that woody biomass, fine root biomass, and SOC concentrations were positively related, while land-use history and soil bulk density showed an inverse relationship to these variables. Silvopastoral systems and forest remnants stored 27-163% more carbon compared to open pasturelands. Our results demonstrate the importance of promoting appropriate silvopastoral systems and conserving forest remnants within livestock-dominated landscapes as a land-based carbon mitigation strategy. Furthermore, our findings also have important implications to help better manage livestock-dominated landscapes and minimize pressures on natural protected areas and biodiversity in the hotspots of deforestation for grassland expansion.
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