Video Experimental Relacionado
Updated: Jul 20, 2026
11:19
Measuring Carbon-based Contaminant Mineralization Using Combined CO2 Flux and Radiocarbon Analyses
Published on: October 21, 2016
Carbono en los bosques amazónicos: flujos estacionales inesperados y pérdidas inducidas por perturbaciones
Scott R Saleska1, Scott D Miller, Daniel M Matross
1Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA 02138, USA. saleska@fas.harvard.edu
Science (New York, N.Y.)
|December 4, 2003
Resumen
Los bosques brasileños de crecimiento antiguo perdieron dióxido de carbono anualmente, contrariamente a las expectativas. Esta pérdida neta de carbono, observada durante tres años, sugiere un menor secuestro de carbono en estos bosques de lo estimado anteriormente.
Área de la Ciencia:
- Ecología Ecología Ecología.
- Ciencias Forestales Ciencias Forestales Ciencias Forestales
- Investigación del ciclo del carbono.
Sus antecedentes:
- Los bosques de crecimiento antiguo son sumideros de carbono cruciales.
- Comprender su papel en el ciclo del carbono es vital para la mitigación del cambio climático.
- Estudios anteriores a menudo asumen que los bosques de crecimiento viejo no perturbados son consistentes sumideros de carbono.
Objetivo del estudio:
- Para medir el intercambio ecosistémico neto de dióxido de carbono (CO2) en dos bosques antiguos en Santarém, Brasil.
- Investigar la dinámica estacional del carbono y compararla con el crecimiento de los árboles y las predicciones de modelos.
- Para evaluar el balance de carbono a largo plazo de estos bosques.
Principales métodos:
- Utilizó métodos de covarianza de remolinos para medir el intercambio neto de CO2 en el ecosistema durante tres años.
- Se realizaron observaciones biométricas para confirmar las mediciones del flujo de carbono.
- Se analizaron las variaciones estacionales en la ganancia y pérdida de carbono.
Principales resultados:
- Se observó una pérdida neta de dióxido de carbono durante la estación húmeda y una ganancia durante la estación seca, invirtiendo los patrones estacionales típicos.
- Calculó una pérdida neta de carbono promedio de 3 años de 1.3 megagramos de carbono por hectárea por año.
- Los datos biométricos confirmaron la pérdida neta de carbono, lo que sugiere un efecto transitorio de las perturbaciones recientes.
Conclusiones:
- Los bosques de crecimiento viejo estudiados están experimentando una pérdida neta de carbono, contrariamente a los ciclos de crecimiento estacional y las predicciones del modelo.
- Las perturbaciones episódicas en bosques antiguos pueden conducir a un menor secuestro neto de carbono que el estimado previamente de sitios no perturbados.
- Estos hallazgos resaltan la importancia de considerar el historial de perturbaciones al evaluar el potencial de secuestro de carbono de los bosques.
Videos de Conceptos Relacionados
00:54What are Biogeochemical Cycles?
The most common elements in organic molecules, carbon, hydrogen, oxygen, nitrogen, sulfur, and phosphorus, are only available in the ecosystem in limited amounts. Therefore, these nutrients must be recycled through both biotic and abiotic components of the ecosystem, in processes generally called biogeochemical cycles.
01:14The Carbon Cycle
Carbon is the basis of all organic matter on Earth, and is recycled through the ecosystem in two primary processes: one in which carbon is exchanged among living organisms, and one in which carbon is cycled over long periods of time through fossilized organic remains, weathering of rocks, and volcanic activity. Human activities, including increased agricultural practices and the burning of fossil fuels, has greatly affected the balance of the natural carbon cycle.
02:26Ecological Disturbance
An ecological disturbance is a temporary disruption in the environment resulting from abiotic, biotic, or anthropogenic factors, causing a pronounced change in an ecosystem. The impact of an ecological disturbance, which can depend on its intensity, frequency, and spatial distribution, plays a significant role in shaping the species diversity within the ecosystem.Ecological disturbances can be caused by an event as small as the trampling of underbrush to an incident as wide-ranging as a forest...
02:31Habitat Fragmentation
Habitat fragmentation describes the division of a more extensive, continuous habitat into smaller, discontinuous areas. Human activities such as land conversion, as well as slower geological processes leading to changes in the physical environment, are the two leading causes of habitat fragmentation. The fragmentation process typically follows the same steps: perforation, dissection, fragmentation, shrinkage, and attrition.
01:24Microbes and the Carbon Cycle
The carbon cycle is a fundamental Earth process involving the transfer of carbon among the biosphere, lithosphere, atmosphere, and hydrosphere. It plays a critical role in regulating the planet’s climate and supporting life by cycling carbon through various chemical forms and reservoirs. Carbon primarily circulates as carbon dioxide (CO₂), representing its oxidized form, while reduced forms such as methane (CH₄) and organic compounds also play essential roles.Microbial activity is central to...
01:27Microbes and Climate Change
Microorganisms are pivotal agents in Earth's biogeochemical cycles, significantly influencing climate dynamics through their metabolic activities. These microbes modulate the levels of key greenhouse gases by both contributing to and helping mitigate climate change.Microbial Contributions to Greenhouse Gas EmissionsRising global temperatures accelerate microbial metabolism, which, in turn, speeds up the decomposition of organic matter. This process releases carbon dioxide (CO₂) through...