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Erin's papers' description
Up to General Carbon Discussion
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Hello,
i only have a couple to report on. i have found others but i am not able to access them via internet so i must copy them form the library. no big deal i am just unsure at this point how to download them so i will figure this out soon! so far though i have found two papers that i find appropriate. trouble is that many papers are interesting and have pertinent information, too many!
Carbon cycling in cultivated land and its global significance.
Authors: Gregory A. Buyanovsky and George H. Wagner
Global Change Biology Volume 4, Issue 2, Page 131, February 1998.
In this journal article, one of the oldest experimental fields in the United States provided positive data that of soils under proper management can influence global carbon. Proper management such as use of mineral fertilizers, reduced tillage, crop rotations, incorporating crop residues and the introduction of more productive cropping varieties all increases the amount of coil organic carbon and decreased the amount of carbon losses to the atmosphere. This all is noticeably occurring post 1950’s as cropping practices have changed considerably from monocropping to the above proper management techniques.
Rate of Carbon Sequestration at Two Thicket Restoration Sites in the Eastern Cape, South Africa Authors: Anthony J. Mills and Richard M. Cowling
Restoration Ecology Volume 14, Issue 1, Page 38, March 2006.
This article is a study of an unusually large semiarid region in South Africa that was inhabited by a thicket of Portulacaria afra, a succulent shrub. Goats devoured it; the land became a savanna and is being restored with cuttings of P. afra. The original xeric site with near complete vegetative cover exceeded 20kg/m2 of carbon storage. Without vegetative cover the carbon storage resulted were “approximately 4.0 kg/m2 in soils to a depth of 500 mm and 4.5 kg/m2 in biomass.” Restoration of the thicket may return up to 8.5kg C/m2, however thus rate is unknown. This study looks at two sites in 1976 and 1983, and reports both the carbon return in biomass and soils.
i only have a couple to report on. i have found others but i am not able to access them via internet so i must copy them form the library. no big deal i am just unsure at this point how to download them so i will figure this out soon! so far though i have found two papers that i find appropriate. trouble is that many papers are interesting and have pertinent information, too many!
Carbon cycling in cultivated land and its global significance.
Authors: Gregory A. Buyanovsky and George H. Wagner
Global Change Biology Volume 4, Issue 2, Page 131, February 1998.
In this journal article, one of the oldest experimental fields in the United States provided positive data that of soils under proper management can influence global carbon. Proper management such as use of mineral fertilizers, reduced tillage, crop rotations, incorporating crop residues and the introduction of more productive cropping varieties all increases the amount of coil organic carbon and decreased the amount of carbon losses to the atmosphere. This all is noticeably occurring post 1950’s as cropping practices have changed considerably from monocropping to the above proper management techniques.
Rate of Carbon Sequestration at Two Thicket Restoration Sites in the Eastern Cape, South Africa Authors: Anthony J. Mills and Richard M. Cowling
Restoration Ecology Volume 14, Issue 1, Page 38, March 2006.
This article is a study of an unusually large semiarid region in South Africa that was inhabited by a thicket of Portulacaria afra, a succulent shrub. Goats devoured it; the land became a savanna and is being restored with cuttings of P. afra. The original xeric site with near complete vegetative cover exceeded 20kg/m2 of carbon storage. Without vegetative cover the carbon storage resulted were “approximately 4.0 kg/m2 in soils to a depth of 500 mm and 4.5 kg/m2 in biomass.” Restoration of the thicket may return up to 8.5kg C/m2, however thus rate is unknown. This study looks at two sites in 1976 and 1983, and reports both the carbon return in biomass and soils.
Hola compañeros.
He estado revisando literatura sobre fijación carbono tanto en sistemas forestales como tambien en sistemos agroforestales. Creo que hay varios conceptos los cuales debemos discutir. Por ejemplo1) Los sistemos de monitoreo para estimar la diferencia en carbono almacenado en suelo y biomasa en sitios con o sin proyectos.
Esto implica la importancia de la linea base en el area de estudio.
2) El concepto de economía de escala, ya que proyectos que fijen 2 o 3 T C/ha/año, tiene costos similares a proyectos que fijen 10 o 15 T C/ha/año.
Esta variable conlleva ha determinar muy bien cual es la zona de vida del estudio, la densidad arborea, biomasa arriba del suelo (que está determinado por biomasa de los componentes leñosos, biomasas del sotobosque; pastos, hierbas, estados juveniles y otros) hojarastra, sistemas radiculares y carbono organico del suelo.Se han hecho mediciones en bosques de Costa Rica que han arrojado las siguientes capacidades de fijación 5.1 Ton C/ha/año Bosque Humedo Premontano hasta 16.7 Ton C/Ha/año Bosque Tropical Humedo (Tosi, 1995)
La biomasa en raices es importante ya que representa el 10 y 40% de la biomasa total (MacDiken, 1997)
4) No hay acuerdo sobre el método de monitorear cambios en carbono del suelo. La acumulación en el suelo es función de la densidad aparente, la cual está en función de otros parametros por ejemplo, tasa de desposión, descomposición y traslocación (Ibrahim, sf)
Otro elemento importante es la historia de la administración de la tierra, el historial de la tierra nos puede ayudar a comprender los cambios biofisicos que se presentan en el análisis. Por ejemplo en el caso de Honduras el cambio de uso de la tierra se está llevando a cabo a partir de Bosque hacia sistemas productivos, lo que tiene incidencias en toda la dinamica de los servicios ecosistémicos.
La pluviosidad y la frecuencia de lluvias es otra variable que incide en la fijación del suelo. Periodos secos alternados con lluvias fuertes producen la caida de la biomasa aerea hacia el suelo, lo que produce cambios sustanciales en las propiedades del suelo y en la erosión.
Otro concepto que debemos conversar se refiere a la permanecia del carbono, lo cual afecta tanto a nuestro objetivo por mantener el potencial de fijación como también la vulnerabilidad de los precios de la Ton de carbono en el mercado internacional. Para discutir este tema es importante conocer bien el concepto de MDL y cuales son las variables implicadas en los procesos de certificación.
La literatura revisada:
Valoración Ecnómica de Almacenamiento y Fijación de Carbono en Bosque Subhumedo Estacional de Santa Cruz Bolivia (Solis, 1998)
Tesis CATIE
Fijación de Carbono en Sistemas Silvopastoriles una Popuesta Metodologica (Andrade et al, sf)
Mercado de los Bonos de Carbono (lobos et al, 2000)
Revista Interamericana de Ambiente, Vol 1, N°1
Diseño de Proyectos de venta de carbono en PYME Forestales (Locatelli et al, sf)