Assessing deforestation in the Argentine Chaco

Boletta, Pedro E.; Ravelo, Andrés C.; Planchuelo, A. M.; Grilli, Mariano P.

doi:10.1016/j.foreco.2006.02.045

Cited by 139 publications

(130 citation statements)

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“…Esto concuerda con Aplin (2004), quien destaca el aumento en la exactitud en la clasificación de la cobertura del suelo en estudios con imágenes satelitales al utilizar información auxiliar como datos geofísicos de elevación, temperatura, caminos y ríos. Una breve revisión de los últimos estudios publicados de cambios de la cobertura del suelo con aplicación de sensores remotos muestra valores de exactitud global similares o inferiores a los obtenidos en el presente estudio (de Barros et al 2005, Boletta et al 2006, Gaveau et al 2007, lo cual ayuda a que las estimaciones de los cambios sean confiables. Otro factor incidente en la alta exactitud alcanzada fue el intenso trabajo de terreno para A B identificar las diferentes coberturas del suelo, logrando establecer más de 300 puntos de referencia distribuidos en las diferentes coberturas.…”

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“…Al realizar una comparación con estudios recientes que han cuantificado la tasa de deforestación en ecosistemas de otras partes del mundo quedan de manifiesto los altos niveles de deforestación reportados en este estudio (cuadro 3). Tasas de deforestación similares o mayores sólo se han reportado en bosques caducifolios de la zona semiárida del Chaco en Argentina (Boletta et al 2006) y en bosques tropicales de Chiapas en México (Cayuela et al 2006) (cuadro 3). Sin embargo, se debe tener precaución en estas comparaciones, ya que pueden existir diferencias en el tipo de información utilizada y especialmente en los criterios de clasificación de la vegetación.…”

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Deforestación en ecosistemas templados de la precordillera andina del centro-sur de Chile

Altamirano

Lara

2010

Bosque (Valdivia)

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SUMMARYA multitemporal analysis to determine the land cover change was conduced in the pre-Andean range of Maule region of Chile. We used satellite imagery from the year 1989 and 2003 to analyze the likely causes of native forest change. In this period, there was a reduction in native forest area of 44% in the study area, which is equivalent to an annual forest loss rate of 4.1%. The native forest area is replaced by shrublands (29%) and exotic forest plantations (27%). A great proportion of current exotic forest plantations are established on lands that were native forest in 1989 (63%). Most forest loss was associated with intermediate elevation and less distance to road network, where native forest area dominated. Native forest replacing by shrublands was associated to selective forest logging and firewood, which leads to degradation of these forests. Native forest replacing by exotic forest plantations was the result of the forestation incentive and an increase in the demand for forest products such as wood and pulp. Because of multiple impacts of the forest loss, we propose to focus the government incentives. Priority areas for incentives must be characterized by high forest loss rate and poverty, presence of threatened species and low availability of water from catchments. Moreover, we propose to prioritize the connectivity of the current network protected areas and to develop an effective forest management monitoring system using advanced technologies.Key words: Maule region, native forest, multitemporal analysis, remote sensing, land cover. RESUMENSe realizó un análisis multitemporal para determinar los cambios en la cobertura del suelo en una zona de la precordillera andina de la Región del Maule, Chile. Para ello se utilizaron imágenes satelitales de los años 1989 y 2003, y se analizaron las causas probables de la deforestación del bosque nativo presente en estos ecosistemas. El bosque nativo se redujo en un 44%, lo cual se traduce en una tasa de deforestación de 4,1% anual. La superficie de bosque nativo fue reemplazada preferentemente por coberturas de matorral (29%) y plantaciones de especies exóticas (27%). Una gran proporción de las actuales plantaciones exóticas está establecida sobre terrenos que anteriormente correspondían a bosque nativo (63%). La mayor pérdida de bosque nativo se concentra en niveles de elevación intermedia, donde se encuentra la mayor superficie de bosque nativo, asociándose también a una menor distancia de la red de caminos. El reemplazo del bosque nativo por matorrales se asocia principalmente a prácticas de floreo y extracción de leña, lo cual produce la degradación del bosque. La sustitución de bosque nativo por especies exóticas se explica por el incentivo a la forestación y por la creciente demanda de productos derivados de la madera y pulpa. Debido a los múltiples impactos que produce la deforestación se propone focalizar los incentivos estatales en áreas con altos niveles de deforestación y pobreza, presencia de especies amenazadas y menor disponibilidad de agua desde...

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Deforestación en ecosistemas templados de la precordillera andina del centro-sur de Chile

Altamirano

Lara

2010

Bosque (Valdivia)

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“…Most studies from the Chaco show consistent pattern of the replacements of native forests by pastures and croplands, particularly soybean plantations (Clark et al, 2010a;Hoyos et al, 2013). In some areas, such as the Cordoba and Santiago del Estero provinces, deforestation rates of 2% to 5% per year have been reported (Boletta et al, 2006;Zak et al, 2004), which is higher than deforestation in some of the world's humid tropical forests (Achard et al, 2002). Recent observations using Landsat imagery show that between 2010 and 2011, more than 600,000 ha of the Dry Chaco ecosystem was deforested, 86% of which occurred in Paraguay, 12% in Argentina and about 2% in Bolivia (Rodas et al, 2012).…”

Section: Luccmentioning

confidence: 92%

“…The expansion to agriculture and the building of new cities and the necessity of fuelwood changed the regions landscapes dramatically (Camus, 2006 (Schulz et al, 2010). Boletta et al (2006) showed high deforestation rates in the Argentine Chaco. Here, from 1992 to 1999, more than 273,000 ha were deforested at an annual rate of 5 percent, with approximately 80 percent of the former forest extent now occupied by crops, pastures, and secondary scrub (Zak et al, 2008).…”

Section: Americamentioning

confidence: 99%

“…From the 1990s, a synergistic combination of global food demand, technology and climatic factors increased the rate of land cover change in the Chaco to those comparable with the Amazon deforestation (Boletta et al, 2006;Zak et al, 2008). Methods for monitoring Dry Chaco deforestation vary from visual interpretations of aerial photos to digital classifications of multi-temporal satellite imagery (Clark et al, 2010a;Gasparri and Grau, 2009;Gasparri et al, 2008;Paruelo et al, 2006;UMSEF, 2007).…”

Section: Luccmentioning

confidence: 99%

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Assessing the impacts of land cover change on climate in non-Amazonian South America

Pérez¹,

Fabián²

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Non-Amazonian South America has one of the highest rates of conversion of native ecosystems globally. Most of the studies investigating the climate impacts of these changes focus on the Amazon while the possible influences that these changes may have on climate of non-Amazonian regions have received less attention. The aim of this thesis was to evaluate the impacts of land use and land cover on the mean and extreme climate of non-Amazonian South America by conducting modelling experiments for pre-clearing (before year 1500) and present (year 2005) land covers. It develops new data sets of changes in land surface characteristics for this period and applies a high resolution regional climate model to simulate the potential impacts of changes in natural vegetation cover.The thesis begins by providing a theoretical framework of land-atmosphere interactions. It then reviews the process of land use and land cover change and subsequent climatic consequences in non-Amazonian South America and identifies those ecosystems most affected and least studied. Nature Geoscience Letters.

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Ecohydrological transformation in the Dry Chaco and the risk of dryland salinity: Following Australia's footsteps?

et al. 2017

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During the last century, the massive conversion of Australian dry forests to crops and pastures triggered the massive soil and groundwater degradation process known as dryland salinity.Currently, South American Chaco's dry forests are undergoing a similar transformation, leading global deforestation rates. The goal of this study was to review existing ecohydrological information about natural and cultivated systems in the Chaco to assess the dryland salinity risks. We review deep soil water, salt stocks, and groundwater recharge from agriculture or native dry forests stands located in a precipitation range of 450-1100 mm. We complement this with water table level records and geoelectric profiles together with personal observations. We use data from 15 Australian studies for comparison. Strong salt leaching, especially after 20 years of forest clearance, indicates the onset of deep drainage following forest conversion to agriculture in the Dry Chaco. Water stocks were more than double in the cleared stands compared to their dry forest pairs, and recharge rates were up to two order magnitude higher in agricultural areas.Although lower atmospheric salt deposition, younger sediments, and relatively high water-consuming agricultural systems in the Dry Chaco attenuate salinization risks compared to Australia, the very flat topography and related shallow water table levels of the South American region could make groundwater recharge and salt mobilization processes more widespread and difficult to manage. The lack of awareness among the general public, farmers, and decision makers about this issue amplifies the problem, making land management plans for the Argentine dry forest territories essential.

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Assessing deforestation in the Argentine Chaco

Cited by 139 publications

References 23 publications

Deforestación en ecosistemas templados de la precordillera andina del centro-sur de Chile

Deforestación en ecosistemas templados de la precordillera andina del centro-sur de Chile

Assessing the impacts of land cover change on climate in non-Amazonian South America

Ecohydrological transformation in the Dry Chaco and the risk of dryland salinity: Following Australia's footsteps?

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