Abstract

BAYONA RODRIGUEZ, Cristihian Jarri; AVILA DIAZGRANADOS, Rodrigo Andrés; RINCON NUMPAQUE, Álvaro Hernán  and  ROMERO ANGULO, Hernán Mauricio. CO₂ soil emission under different methods of oil palm replanting. Rev. Fac. Nac. Agron. Medellín [online]. 2015, vol.68, n.2, pp.7619-7625. ISSN 0304-2847.  https://doi.org/10.15446/rfnam.v68n2.50949.

Colombian oil palm plantations have started a large-scale replanting phase. The replanting process has an effect on the disposal of biomass, plant health management, and agro-ecological conditions due to the disturbance that is generated. This document addresses soil respiration (CO₂ flux) as a response variable of crop replanting. Seven renovation methods used in Colombia were tested. The measurements were taken over time after the disturbance and planting of the new crop. This study was carried out in the municipality of Tumaco between August of 2009 and June of 2011 using 7 methods of renovation and 4 stages of crop development. The CO₂ flow was measured at 12 points in each plot. There were no significant differences for the CO₂ emission among the replanting methods. The average value for respiration was 929 mg CO₂ m-2 h-1 (± 270.3); however, significant differences were found over time. This response was not related to fluctuations of soil temperature and moisture; therefore, there should be an associated response to biotic factors (microbial organisms) not established in this study. The values suggested that the soil of the plots under a replanting process emitted considerable quantities of carbon into the atmosphere, but the emissions declined over time and, in turn, were offset by the photosynthesis of the new crop (14 m CO₂ m-2s-1 ± 1.4, data not shown), creating an overall positive carbon balance.

Keywords : Biomass decomposition; CO₂ flux; Elaeis guineensis; soil disturbance.

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