Resumen

LOPEZ ORTIZ, María et al. Carbon sequestration in soils associated with Pinus greggii Engelm. And Pinus oaxacana Mirov. In the High Mixteca, Oaxaca. Ecol. apl. [online]. 2017, vol.16, n.2, pp.127-133. ISSN 1726-2216.  http://dx.doi.org/10.21704/rea.v16i2.1016.

The amount of litter accumulated, organic matter (MO) and organic carbon (CO) in soils associated to thirteen provenances of Pinus greggii Engelm. and eight provenances of Pinus oaxacana Mirov. at Tlacotepec Plumas (TP) and Magdalena Zahuatlán (MZ), Oaxaca, México were determined. The amount of litter was obtained in a sampling site of 0.25 m², gathering all the litter around. In the same sampling site, a profile of 20 cm of depth was opened in order to take a soil sample, which was sieved (>2 mm) and dried for 24 h. Then the pH of the saturated paste extract and the % of organic matter (MO) were determined. The % of MO was multiplied by 0.58 to convert it into organic carbon (CO). For P. greggii, El Madroño accumulated more litter in both communities (27.87 Mg ha^-1 and 21.85 Mg ha^-1, respectively); at TP, Tres Lagunas accumulated the highest content of MO and CO (7.65% and 26.62%, respectively); while at MZ, Jamé showed higher amount of MO and CO (7.91% and 24.78%, respectively); For P. oaxacana, Yudolahuerta showed higher amount of litter at TP (10.57 Mg ha^-1), and at MZ it was Magdalena Zahuatlán (3.68 Mg ha^-1). The highest amount of MO was found at Magdalena Zahuatlán (6.99%) in TP and Los Molinos showed the highest amount of CO (9.74%). Variation in the concentration of CO between localities, species and provenances was found.

Palabras clave : organic matter; carbon sink; litter; CO₂ absorption.

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