Abstract

LOPEZ-TELOXA, Leticia Citlaly  and  MONTERROSO-RIVAS, Alejandro Ismael. CO2 MITIGATION STRATEGIES BASED ON SOIL RESPIRATION. La Granja [online]. 2020, vol.32, n.2, pp.30-41. ISSN 1390-8596.  https://doi.org/10.17163/lgr.n32.2020.03.

Soil, in addition to storing, provides CO2 to the atmosphere emitted by soil respiration, mainly due to biotic and abiotic factors, as well as soil management. The objective of the research was to evaluate soil respiration in different uses and quantify its CO2 emissions at two different times of the year, as well as estimate its storage to make a balance to establish strategies that allow with the climate change mitigation. The CO2 emission was measured every 30 min by using a closed dynamic chamber placed on the soil and integrated with an infrared gas analyzer, as well as temperature and moisture of the soil with sensors. Three land uses (agroforestry, forestry and agricultural) and two seasons of the year (summer and winter) were analyzed for 24 continuous hours at each site. Positive correlation between environmental temperature and soil respiration was found. The agricultural system stores low carbon content in the soil (50.31 t C ha-1) and emits 9.28 t of C ha-1 in the highest temperature season, in contrast to a natural system that emits 3.98 t of C ha-1 and stores 198.90 t of C ha-1. The balance sheet reflects the need to know CO2 emissions to the atmosphere from soils and not just storages. Having scientific support from the ground to the atmosphere is an important step in decision-making that will contribute to climate change mitigation.

Keywords : Agricultural; C storage; land use change; agroforestry; forestry.

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