Donaldo Bran

Donaldo Bran
Instituto Nacional de Tecnología Agropecuaria | inta · Estación Experimental Agropecuaria

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89
Publications
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4,931
Citations
Citations since 2017
19 Research Items
3276 Citations
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20172018201920202021202220230100200300400500600
20172018201920202021202220230100200300400500600

Publications

Publications (89)
Article
Grazing represents the most extensive use of land worldwide. Yet its impacts on ecosystem services remain uncertain because pervasive interactions between grazing pressure, climate, soil properties, and biodiversity may occur but have never been addressed simultaneously. Using a standardized survey at 98 sites across six continents, we show that in...
Article
Grazing represents the most extensive use of land worldwide. Yet its impacts on ecosystem services remain uncertain because pervasive interactions between grazing pressure, climate, soil properties, and biodiversity may occur but have never been addressed simultaneously. Using a standardized survey at 98 sites across six continents, we show that in...
Article
Full-text available
Temporal variations on NDVI predict temporal changes in vegetation cover across Patagonian drylands (Argentina). In drylands, natural vegetation is an important source of livelihood as they provide food, fuel and forage for livestock. In addition to the provision of goods and services, dryland vegetation also plays an important role in many ecologi...
Article
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We present the MaRaS (Environmental Monitoring of arid and Semiarid Regions) dataset, which stores vegetation and soil data of 426 rangeland monitoring plots installed throughout Patagonia, a 624.500 km 2 area of southern argentina and Chile. Data for each monitoring plot includes basic climatic and landscape features, photographs, 500 point interc...
Article
Full-text available
We investigate the timescales of the horizontal mass flux decay of wind remobilised volcanic particles in Argentina, associated with the tephra-fallout deposit produced by the 2011–2012 Cordón Caulle (Chile) eruption. Particle removal processes are controlled by complex interactions of meteorological conditions, surface properties and particle depl...
Article
Full-text available
Although volcanic eruptions represent short periods in the whole history of a volcano, the large amount of loose pyroclastic material produced, combined with aeolian processes, can lead to continuous, long-lasting reworking of volcanic products. Driven by wind, these processes significantly influence the geomorphology and prolong the impacts of eru...
Chapter
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En la primera etapa de la implementación del Sistema Nacional de Monitoreo y Evaluación de la Degradación de Tierras y Desertificación a nivel local se seleccionaron y consensuaron un conjunto mínimo de indicadores que proporcionan información para describir el estado o la calidad del ambiente en los Sitios Piloto y para determinar la línea de base...
Book
Full-text available
La degradación de tierras es uno de los mayores problemas ambientales que afecta a la Argentina y conlleva fuertes consecuencias socio-económicas. Más del 80 % del territorio cubierto por zonas secas del país se encuentra afectado por desertificación (LADA/FAO, 2011). Es causada principalmente por el manejo ganadero y agrícola inapropiado, como así...
Conference Paper
Full-text available
RESUMEN El monitoreo de variables biofísicas de cambio lento de vegetación y suelos se hace a escalas regionales y en períodos que se cuentan en décadas. Requiere colaboración de equipos científicos, de instituciones en diversas biozonas que deben acordar métodos comunes y compartir información georreferenciada. Se presenta en este trabajo la base...
Article
MARAS (Monitoring of Arid and Semiarid Regions) consists of 379 ground monitors in Patagonia, a 624.500 km² semiarid area of southern Argentina and Chile. The objective of this paper was to describe the system and analyze four variables of the initial data base. Floristic composition, diversity and cover were analyzed with intercept lines (500 poin...
Conference Paper
Full-text available
Ash storms in Patagonia: a latent and underestimated hazard
Article
The 2011–2012 Cordón Caulle eruption emitted about 1 km3 of rhyodacitic tephra. Dominant westerly winds in the region caused most of the primary tephra to deposit in neighboring Argentina. In addition to the impact of widespread dispersal and fallout of primary tephra during the eruption, Argentina was also significantly affected by remobilization...
Article
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1. Dryland vegetation is characterized by discrete plant patches that accumulate and capture soil resources under their canopies. These "fertile islands" are major drivers of dryland ecosystem structure and functioning, yet we lack an integrated understanding of the factors controlling their magnitude and variability at the global scale. 2. We cond...
Book
Full-text available
En el presente Manual quedan plasmados los avances logrados a través de las últimas dos carteras de proyectos de INTA, enmarcados en el anterior Programa Nacional Ecorregiones y el actual Programa Nacional Suelo. El aporte de los grupos de investigación activos de INTA de diferentes puntos del territorio, en articulación con investigadores de recon...
Article
Full-text available
Over 65% of drylands are used for grazing of managed livestock. Understanding what drives grazing effects on the structure and functioning of rangelands is critical for achieving their sustainability. We studied a network of 239 sites across Patagonian rangelands (Argentina), which constitute one of the world's largest rangeland area. We aimed to (...
Article
Full-text available
Wind erosion of freshly-deposited volcanic ash causes persistent storms, strongly affecting ecosystems and human activity. Wind erosion of the volcanic ash was measured up to 17 months after the ash deposition, at 7 sites located within the ash-deposition area. The mass flux was measured up to 1.5 m above ground level. Mass transport rates were ove...
Conference Paper
Full-text available
Introduction: Long-term land monitoring technology is needed to track slow changes in arid lands and evaluate biodiversity, biological invasions, local extinctions and physical or chemical soil variations including carbon storage. Consistent data sets are lacking because researchers and government agencies use multiple techniques to evaluate the sa...
Article
Full-text available
La degradación de tierras es uno de los mayores problemas ambientales de la Argentina. Para gestionar esta problemática se requieren sistemas de monitoreo que permitan detectar su tendencia y proporcionen alertas tempranas. Recientemente se han desarrollado metodologías de monitoreo basadas en índices de imágenes satelitales, siendo NDVI (Normalize...
Article
Full-text available
Significance Climate change is increasing the degree of aridity in drylands, which occupy 41% of Earth’s surface and support 38% of its population. Soil bacteria and fungi are largely responsible for key ecosystem services, including soil fertility and climate regulation, yet their responses to changes in aridity are poorly understood. Using a fiel...
Chapter
Full-text available
Argentina is one of the countries with a vibrant agricultural sector, which provides both economic development opportunities and environmental challenges. Argentina was selected as a case study due to its rich land degradation data, its diverse agroecological systems, and rapid poverty reduction. The country also represents high human development i...
Article
Full-text available
Climate and human impacts are changing the nitrogen (N) inputs and losses in terrestrial ecosystems. However, it is largely unknown how these two major drivers of global change will simultaneously influence the N cycle in drylands, the largest terrestrial biome on the planet. We conducted a global observational study to evaluate how aridity and hum...
Technical Report
Full-text available
Evaluación y cartografía de mallines de la zona de Junín de los Andes, provincia del Neuquén Gaitán, J.; Bran D.; Raffo, F.; Ayesa J.; Umaña, F.
Article
Land degradation is one of the main environmental concerns in Argentina. Monitoring systems to detect trend and provide early warnings are required to deal with this issue. Recently, there have been developed monitoring methodologies based on indices derived from satellite images, among them the most widely used is the NDVI (Normalized Difference V...
Article
Drylands cover about 41% of Earth's land surface, and 65% of their area supports domestic livestock that depends on the above-ground net primary productivity (ANPP) of natural vegetation. Thus, understanding how biotic and abiotic factors control ANPP and related ecosystem functions can largely help to create more sustainable land-use practices in...
Article
Full-text available
Drought is an increasingly common phenomenon in drylands as a consequence of climate change. We used 311 sites across a broad range of environmental conditions in Patagonian rangelands to evaluate how drought severity and temperature (abiotic factors) and vegetation structure (biotic factors) modulate the impact of a drought event on the annual int...
Article
Full-text available
Geographic, climatic, and soil factors are major drivers of plant beta diversity, but their importance for dryland plant communities is poorly known. This study aims to: i) characterize patterns of beta diversity in global drylands, ii) detect common environmental drivers of beta diversity, and iii) test for thresholds in environmental conditions d...
Article
Full-text available
Aim Geographical, climatic and soil factors are major drivers of plant beta diversity, but their importance for dryland plant communities is poorly known. The aim of this study was to: (1) characterize patterns of beta diversity in global drylands; (2) detect common environmental drivers of beta diversity; and (3) test for thresholds in environment...
Article
Assessing the spatial variability of ecosystem structure and functioning is an important step towards developing monitoring systems to detect changes in ecosystem attributes that could be linked to desertification processes in drylands. Methods based on ground-collected soil and plant indicators are being increasingly used for this aim, but they ha...
Article
Full-text available
The biogeochemical cycles of carbon (C), nitrogen (N) and phosphorus (P) are interlinked by primary production, respiration and decomposition in terrestrial ecosystems1. It has been suggested that the C, N and P cycles could become uncoupled under rapid climate change because of the different degrees of control exerted on the supply of these elemen...
Article
The biogeochemical cycles of carbon (C), nitrogen (N) and phosphorus (P) are interlinked by primary production, respiration and decomposition in terrestrial ecosystems. It has been suggested that the C, N and P cycles could become uncoupled under rapid climate change because of the different degrees of control exerted on the supply of these element...
Conference Paper
Full-text available
On the basis of the Land Degradation Assessment in Drylands (LADA, 2003-2011) project, that successfully addressed the problem of land degradation in Argentina, the Secretariat of Environment and Sustainable Development (SAyDS), the National Scientific and Technical Research Council and its institute with involvement in the theme (IADIZA), the Nati...
Chapter
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Contents 1 Economics of Land Degradation and Improvement: An Introduction and Overview . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Ephraim Nkonya, Alisher Mirzabaev and Joachim von Braun 2 Concepts and Methods of Global Assessment of the Economics of Land Degradation and Improvement. . . . . . . . . . . . . . . . . . . . 15 Ephraim Nkonya...
Article
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Experiments suggest that biodiversity enhances the ability of ecosystems to maintain multiple functions, such as carbon storage, productivity, and the buildup of nutrient pools (multifunctionality). However, the relationship between biodiversity and multifunctionality has never been assessed globally in natural ecosystems. We report here on a globa...
Technical Report
Full-text available
Monitoreo de la distribución de cenizas volcánicas en Río Negro y Neuquén: situación a los 6 meses de la erupción 22 de diciembre de 2011
Article
Full-text available
Prediction of invasive species spread helps to plan management actions. We performed a risk assessment by quantifying habitat invasibility, predicted the potential distribution of an invasive species using the Maxent modelling program and confirmed patterns using detailed field studies. Our study was conducted in southern Argentina, Patagonia, wher...
Article
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Natural distribution of Nothofagus alpina and Nothofagus obliqua (Nothofagaceae) in Argentina, two productively important tree species of the North Patagonian temperate forests. Knowing the natural range of any species is essential to plan its conservation or use. The South-American beeches Raulí [Nothofagus alpina (Poepp. & Endl.) Oerst. = Nothofa...
Article
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“Mallines” are characteristic Patagonian wet meadows. The objectives of this study were to describe plant community composition in the main mallines in northern Patagonia and to determine the influence of selected environmental variables on the distribution of vegetation. Fifty-two sites were selected for vegetation surveys and measurements of wate...
Book
Full-text available
En el marco del programa de domesticación que el INTA está llevando a cabo para las especies forestales nativas Raulí y Roble Pellín, se realizó un estudio para definir áreas potenciales de cultivo de estas especies en la Provincia de Río Negro a través del desarrollo de un sistema de información geográfica (SIG). La metodología consistió en establ...
Article
La erosión eólica puede alterar la calidad de los suelos y la atmósfera. La magnitud de estos efectos es variable según el tipo de suelo y su uso, y está asociada con el tipo de transporte de las partículas: rodadura y saltación deterioran más el suelo mientras que la suspensión tiende a emitir partículas finas (PM10) afectando la calidad del aire....
Article
La ganadería ovina durante más de 100 años produjo grandes cambios en los ecosistemas y es una de las principales causas de la desertificación en la estepa patagónica. Este trabajo tiene por objetivo evaluar los efectos del pastoreo sobre el suelo y la vegetación mediante la aplicación de una versión modificada de la metodología «Landscape Function...
Article
Full-text available
Question: (1) Which factors regulate post-fire recruitment and spread of the shrub Senecio bracteolatus in Patagonian grasslands? (2) What is the role of the grass Stipa speciosa on S. bracteolatus establishment in the post-fire succession? Location: Northwest Patagonia, Argentina. Methods: We studied the effect of fire on S. bracteolatus recruitme...
Data
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RESUMEN La ganadería ovina durante más de 100 años produjo grandes cambios en los ecosistemas y es una de las principales causas de la desertificación en la estepa patagónica. Este trabajo tiene por objetivo evaluar los efectos del pastoreo sobre el suelo y la vegetación mediante la aplicación de una versión modificada de la metodología «Landscape...
Article
Wind erosion can impact soil and air quality. The magnitude of these effects depends on the soil type and management conditions, and is associated with the transport conditions of soil particles: saltation and rolling affect soil quality to a greater extent while suspension tends to increase the emission of fine particles to the atmosphere. The obj...
Article
More than 100 years of sheep breeding has caused profound changes to ecosystems and is one of the main causes of desertification in the Patagonian steppe. The aim of this study was to evaluate sheep grazing effects on soils and vegetation, applying a modified version of the «Landscape Function Analysis» methodology developed in Australia. The study...
Article
Full-text available
The fruit mineral contents (K, Ca, Ba, Br, Zn, Co, Cr, Fe, Na, Rb, Cs, and Sr) of four native and two exotic naturalized shrubs growing in different areas of the Andean Patagonian region of Argentina were investigated. Native species Berberis darwinii, Berberis microphylla (Berberidaceae), Aristotelia chilensis (Elaeocarpaceae) and Ribes magellanic...
Article
The effect of burn severity on soil organic carbon concentration (COS) in vegetated mounds and in bare soil intermounds was evaluated 4 years after the occurrence of a natural fire in an area of the Monte Austral (Río Negro province). The mounds act as "fertility islands" since COS concentration was higher than in the intermounds. The COS concentra...
Article
Full-text available
Effect of burn severity on vegetation recovery in the Austral Monte: Fire has been a recurrent phenomenon in Northeast region of Patagonia and it takes place, mainly, after humid years that promote the growth of the grasses. The consequent accumulation of fine combustible material favors the propagation of fire. However, little is known about the p...
Article
Fire has been a recurrent phenomenon in Northeast region of Patagonia and it takes place, mainly, after humid years that promote the growth of the grasses. The consequent accumulation of fine combustible material favors the propagation of fire. However, little is known about the post-fire evolution of the vegetation in relation to the magnitude of...