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Agrociencia
versión On-line ISSN 2521-9766versión impresa ISSN 1405-3195
Agrociencia vol.41 no.7 Texcoco oct./nov. 2007
Water-Soils-Climate
Accumulation of soil organic carbon in Pinus michoacana reforestations
1 Forestal, Campus Montecillo. Colegio de Postgraduados. 56230. Carretera México-Texcoco km. 36.5. Montecillo, Estado de México. (lsmejia@colpos.mx) (agomezg@colpos.mx) (gangeles@colpos.mx) (lopezma@colpos.mx).
2 Edafología. Campus Montecillo. Colegio de Postgraduados. 56230. Carretera México-Texcoco km. 36.5. Montecillo, Estado de México. (jetchev@colpos.mx).
3 Universidad de California. Campus Davis, EE.UU. (wrhorwath@ucdavis.edu)
The transfer of stable carbon from vegetation to the soil is an important process for reducing elevated concentrations of atmospheric CO2. The objective of the present study was to calculate the mass of new soil organic carbonic (NSOC) incorporated as a result of the establishment of reforestation with Pinus michoacana. Plots sown with corn were studied, in which a portion of the area was reforested with pine. The amount of NSOC was calculated from the differences in composition of isotopes (δ13 C) from the soil and plant tissue, in a chronosequence, with the simple mixture model. Results indicated statistical differences (p≤0.001) in δ13 C between the group of corn plots and the reforestations. The amount of NSOC was 62 and 18%, in the depths of 0-5 and 5-10 cm in reforestations of 20 years. The fit of the data by apparent density and the use of a quadratic model indicated that the average mass of NSOC incorporation is 11.2 and 2.30 Mg ha−1 at 20 years, and the accumulation rates are 0.561 and 0.11 Mg ha−1 year−1 at the same depths. No NSOC from pine was found at depths of over 10 cm, which suggests a higher carbon dynamic in the superficial soil.
Key words: δ13 C; chronosequences in andisols; stable isotopes; soil organic matter
La transferencia de carbono estabilizado de la vegetación al suelo es un proceso importante para abatir las concentraciones elevadas de CO2 atmosférico. El objetivo de este trabajo fue calcular la masa de nuevo carbono orgánico del suelo (NCOS) incorporada como resultado del establecimiento de reforestaciones con Pinus michoacana. Se estudiaron parcelas con cultivo de maíz, en las cuales una porción del área se reforestó con pino. La cantidad de NCOS se calculó a partir de las diferencias en composición de isótopos (δ13 C) del suelo y tejido vegetal, en una cronosecuencia, con el modelo simple de mezclas. Los resultados indicaron diferencias estadísticas (p≤0.001) en δ13 C entre el grupo de parcelas de maíz y las reforestaciones. La proporción de NCOS fue 62 y 18%, en las profundidades de 0-5 y 5-10 cm en reforestaciones de 20 años. El ajuste de los datos por densidad aparente y el uso de un modelo cuadrático indicó que la masa promedio de incorporación de NCOS es 11.2 y 2.30 Mg ha−1 a los 20 años, y tasas de acumulación de 0.561 y 0.11 Mg ha−1 año−1 en las mismas profundidades. No se encontró NCOS desde pinos en profundidades mayores a 10 cm, lo que sugiere una dinámica de carbono más alta en el suelo superficial.
Palabras clave: δ13C; cronosecuencias en andosoles; isótopos estables; materia orgánica del suelo
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Received: November 2006; Accepted: August 2007
Este es un artículo publicado en acceso abierto bajo una licencia Creative Commons
