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<p>The integration of trees in degraded livestock grazing lands can enhance soil carbon sequestration through increased organic matter input, their turnover, and stabilized soil carbon dioxide (CO<sub>2</sub>) fluxes. This study aimed to evaluate and compare the dynamics of soil CO<sub>2</sub> fluxes, environmental parameters, and soil organic carbon (SOC) storage in silvopastoral systems with native trees (STP) and conventional pasture monoculture (PM). We measured the soil CO<sub>2</sub> fluxes in STP and PM twice a month from March to September 2022, representing the dry and rainy seasons. Measurements were made in situ in the morning, afternoon, and night in both livestock systems using an infrared gas analyzer (EGM-5®, PP Systems, USA). Ambient temperature, soil temperature (°C), and soil moisture (%) were simultaneously monitored. Overall, STP showed higher soil CO<sub>2</sub> fluxes than PM, which were more pronounced in the dry season. The soil moisture was higher in STP than in PM during the dry season, explaining the increase in CO<sub>2</sub> fluxes during that period. The diurnal variations of soil CO<sub>2</sub> fluxes showed the highest values in the mornings with averages of 8.7 and 7.9&#xa0;µmole&#xa0;m<sup>−2</sup>&#xa0;s<sup>−1</sup>, respectively, in STP and PM. Soil CO<sub>2</sub> fluxes correlated positively with soil moisture and were higher in the rainy season in both systems. STP stored 76.79&#xa0;Mg&#xa0;ha<sup>−1</sup> of SOC at 0–30&#xa0;cm depth compared to 51.07&#xa0;Mg&#xa0;ha<sup>−1</sup> in PM. Higher CO<sub>2</sub> flux and greater SOC storage make silvopasture more dynamic than pasture monoculture for carbon cycling, but further research on carbon input, its mineralization kinetics, and the relationship with microbial activity would better explain the higher soil CO<sub>2</sub> fluxes in STP than in PM.</p>

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Soil CO2 fluxes and carbon storage in livestock systems with native trees in pastures in the subhumid tropics of Mexico

  • 期刊论文

  • 发表日期：

    2025年8月28日

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  • Fernando Casanova-Lugo,
  • Dixan Pozo-Leyva,
  • Armando Escobedo-Cabrera,
  • Héctor Estrada-Medina,
  • Luis A. Lara-Pérez,
  • Ricardo L. D. Costa,
  • Adibe L. Abdalla,
  • Gilberto Villanueva-López,
  • Deb R. Aryal

摘要

The integration of trees in degraded livestock grazing lands can enhance soil carbon sequestration through increased organic matter input, their turnover, and stabilized soil carbon dioxide (CO2) fluxes. This study aimed to evaluate and compare the dynamics of soil CO2 fluxes, environmental parameters, and soil organic carbon (SOC) storage in silvopastoral systems with native trees (STP) and conventional pasture monoculture (PM). We measured the soil CO2 fluxes in STP and PM twice a month from March to September 2022, representing the dry and rainy seasons. Measurements were made in situ in the morning, afternoon, and night in both livestock systems using an infrared gas analyzer (EGM-5®, PP Systems, USA). Ambient temperature, soil temperature (°C), and soil moisture (%) were simultaneously monitored. Overall, STP showed higher soil CO2 fluxes than PM, which were more pronounced in the dry season. The soil moisture was higher in STP than in PM during the dry season, explaining the increase in CO2 fluxes during that period. The diurnal variations of soil CO2 fluxes showed the highest values in the mornings with averages of 8.7 and 7.9 µmole m−2 s−1, respectively, in STP and PM. Soil CO2 fluxes correlated positively with soil moisture and were higher in the rainy season in both systems. STP stored 76.79 Mg ha−1 of SOC at 0–30 cm depth compared to 51.07 Mg ha−1 in PM. Higher CO2 flux and greater SOC storage make silvopasture more dynamic than pasture monoculture for carbon cycling, but further research on carbon input, its mineralization kinetics, and the relationship with microbial activity would better explain the higher soil CO2 fluxes in STP than in PM.