Producción de raíces finas en dos bosques de tierra firme sobre suelos diferentes en la amazonia colombiana

dc.contributorJames Lloyd, Jonathan
dc.contributorMoreno Hurtado, Flavio Humberto
dc.contributorPeñuela Mora, María Cristina
dc.creatorJiménez-Rojas, Eliana María
dc.date.accessioned2020-03-03T21:04:50Z
dc.date.accessioned2022-09-21T14:13:53Z
dc.date.available2020-03-03T21:04:50Z
dc.date.available2022-09-21T14:13:53Z
dc.date.created2020-03-03T21:04:50Z
dc.date.issued2007-08-01
dc.identifierhttps://repositorio.unal.edu.co/handle/unal/75813
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/3362244
dc.description.abstractSe ha propuesto que en un gradiente de aumento de recursos en el suelo, se da una disminución en la asignación de carbono a la parte subterránea (raíces finas). Para evaluar esta hipótesis, se estimó la masa y producción de raíces finas (< 2 mm) a través de dos métodos: 1) cilindros de crecimiento, 2) cilindros secuenciales, durante 2,2 años en dos bosques de tierra firme sobre suelos diferentes en la Amazonia colombiana. Las diferencias de recursos en el suelo estuvieron determinadas por el tipo y las propiedades físico-químicas del suelo: un bosque sobre suelos arcillosos (Ultisol) en el Parque Natural Nacional Amacayacu (AMA) y, otro sobre suelos arenosos (Spodosol) en la Estación Biológica El Zafire (ZAB), ubicada en la Reserva Forestal del Río Calderón. Se encontró que a lo largo del periodo monitoreado y en los dos bosques, la masa y producción de raíces finas presentaron diferencias significativas entre profundidades del suelo (0–10 y 10–20 cm) y, también entre bosques. ZAB asignó más carbono a las raíces finas que AMA; la producción en ZAB fue el doble (2,98 y 3,33 Mg C ha-1 año-1, método 1 y 2, respectivamente) que la de AMA (1,51 y 1,36–1,03 Mg C ha-1 año-1, método 1 y 2, respectivamente), así mismo, la masa promedia de raíces finas fue más alta en ZAB (10,94 Mg C ha-1) que en AMA (3,04–3,64 Mg C ha-1). Adicionalmente, la masa de las raíces finas mostró una variación temporal que se relacionó con la precipitación y, se observó que en el período seco del año del 2005 la producción de raíces finas disminuyó marcadamente. Por otro lado, las constantes de descomposición encontradas fueron de las más altas reportadas para otros bosques en el mundo (k=-4,19 y -4,50 años-1, para AMA y ZAB, respectivamente). Se sugiere que los recursos en el suelo juegan un papel importante en la asignación de carbono en estos bosques y, que la asignación de carbono a las partes aérea y subterránea en estos bosques es diferencial, pero que probablemente no existan diferencias en la productividad primaria neta total entre los dos bosques.
dc.description.abstractIt has been hypothesized that in a gradient of increase of soil resources a decrease occurs in the carbon allocated to belowground production (fine roots). To evaluate this hypothesis, I measured the mass and production of fine roots (<2 mm), by two methods: 1) ingrowth cores and, 2) sequential cores, during 2,2 years in two lowland forests with different soils in the Colombian Amazon. The differences of soil resources were determined by the type and the physico-chemical properties of the soil: a forest on loamy soil (Ultisol) at the Amacayacu National Natural Park (AMA) and, the other on white sands (Spodosol) at the Biological Station El Zafire (ZAB), located in the Forest Reservation of the Calderón River. I found that along the monitoring period and in the two forests, the mass and production of fine roots was significantly different between soil depths (0–10 and 10–20 cm) and, also between forests. ZAB allocated more carbon to fine roots than AMA, the production in ZAB was twice (2,98 and 3,33 Mg C ha-1 year-1, method 1 and 2, respectively) than in AMA (1,51 and 1,36-1,03 Mg C ha-1 year-1, method 1 and 2, respectively); similarly, the average of fine root mass was higher in ZAB (10,94 Mg C ha-1) that in AMA (3,04–3,64 Mg C ha-1). Additionally, the mass of fine roots showed a temporal variation that was related with rainfall and, it was observed that in the dry period of the year 2005 the production of fine roots decreased substantially. On the other hand, the decomposition constants were among the highest reported for other forests in the world (k=-4,19 and -4,50 year-1, for AMA and ZAB, respectively). My results suggest that soil resources play an important role in the carbon allocation in these forests and, that the carbon allocated to the above and belowground organs in these forests is differential, but probably there are not differences in the total net primary productivity between these two forests.
dc.languagespa
dc.publisherUniversidad Nacional de Colombia - Sede Amazonas
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dc.titleProducción de raíces finas en dos bosques de tierra firme sobre suelos diferentes en la amazonia colombiana
dc.typeTesis


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