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<p>An essential factor for understanding root respiration, in addition to carbon dioxide emission, is the soil oxygen influx, thus the objective was to evaluate carbon dioxide (CO<sub>2</sub>) emissions and oxygen (O<sub>2</sub>) influx (soil respiration) in soils with and without vegetation, understanding the contribution of root respiration to total soil respiration and its correlation with meteorological variables. Monitoring took place with readings at 7, 10, 12, 15 and 17&#xa0;h (system 24&#xa0;h) in different environmental conditions. To design the experiment, two plots of 1m<sup>2</sup> were adopted under the conditions of bare soil and soil vegetated with grass (<i>Paspalum Notatum</i>). To determine the emission of CO<sub>2</sub> from the soil, the Li-8100 portable system was used, while the influx of O<sub>2</sub> from the soil was obtained by linear interpolation of the oxygen variation in the chamber using a smart oxygen sensor UV Flux 25% model CM-42,951. The data were subjected to analysis of variance for repeated measures over time. The results demonstrated that CO<sub>2</sub> emission and O<sub>2</sub> influx are higher in vegetated soil. The peak CO<sub>2</sub> emission and the peak oxygen influx occur between 10 and 15&#xa0;h. CO<sub>2</sub> emission was strongly associated with soil moisture without vegetation (<i>r</i> = 0.76; <i>p</i> &lt; 0.05) and with vegetation (<i>r</i> = 0.80, <i>p</i> &lt; 0.05). The soil O<sub>2</sub> influx in the vegetated soil was associated with photosynthetically active radiation (<i>r</i> = 0.85, <i>p</i> &lt; 0.05) and is linked to the activity of photosynthesis and consequently root respiration. The existence of root respiration and its dependence on the soil O<sub>2</sub> influx are concluded, as the O<sub>2</sub> influx is increased in vegetated soils in relation to bare soil. And finally, root respiration represented 27 to 48% of soil respiration for the evaluated scenario.</p>

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Partitioning Soil Respiration: Differentiating Root Contributions and Environmental Factors

  • 期刊论文

  • 发表日期：

    2026年1月14日

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  • Wanderson Benerval de Lucena,
  • Daniel Carlos Machado,
  • Polyana Pereira,
  • Maria Elisa Vicentini,
  • José A. Neira Román,
  • Glauco de Sousa Rolim,
  • Alan Rodrigo Panosso,
  • Newton La Scala Jr

摘要

An essential factor for understanding root respiration, in addition to carbon dioxide emission, is the soil oxygen influx, thus the objective was to evaluate carbon dioxide (CO2) emissions and oxygen (O2) influx (soil respiration) in soils with and without vegetation, understanding the contribution of root respiration to total soil respiration and its correlation with meteorological variables. Monitoring took place with readings at 7, 10, 12, 15 and 17 h (system 24 h) in different environmental conditions. To design the experiment, two plots of 1m2 were adopted under the conditions of bare soil and soil vegetated with grass (Paspalum Notatum). To determine the emission of CO2 from the soil, the Li-8100 portable system was used, while the influx of O2 from the soil was obtained by linear interpolation of the oxygen variation in the chamber using a smart oxygen sensor UV Flux 25% model CM-42,951. The data were subjected to analysis of variance for repeated measures over time. The results demonstrated that CO2 emission and O2 influx are higher in vegetated soil. The peak CO2 emission and the peak oxygen influx occur between 10 and 15 h. CO2 emission was strongly associated with soil moisture without vegetation (r = 0.76; p < 0.05) and with vegetation (r = 0.80, p < 0.05). The soil O2 influx in the vegetated soil was associated with photosynthetically active radiation (r = 0.85, p < 0.05) and is linked to the activity of photosynthesis and consequently root respiration. The existence of root respiration and its dependence on the soil O2 influx are concluded, as the O2 influx is increased in vegetated soils in relation to bare soil. And finally, root respiration represented 27 to 48% of soil respiration for the evaluated scenario.