Sandra Josefina Bravo

Sandra Josefina Bravo
Universidad Nacional de Santiago del Estero | UNSE · Facultad de Ciencias Forestales, Instituto de Silvicultura y Manejo de Bosques

Dr. in Biology Sciences
Our lab is working about fire ecology, plant regeneration strategies after disturbances and seed biology.

About

85
Publications
40,133
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Introduction
Our lab has just finished two research projects - Ecological studies on soil seed banks of native woody species from Argentine Chaco region and disturbance effects - Vegetative regeneration strategies of native woody species in disturbed forests. Currently, we are starting to work in microsites and biological crusts as bioindicators.
Additional affiliations
September 2014 - January 2017
Universidad Nacional de Santiago del Estero
Position
  • Professor (Assistant)
March 2000 - September 2014
Universidad Nacional de Santiago del Estero
Position
  • Researcher
September 1994 - March 2000
Universidad Nacional de Santiago del Estero
Position
  • Research Associate
Education
September 2002 - June 2006
National University of Tucuman
Field of study
  • Ecología de fuego en leñosas

Publications

Publications (85)
Chapter
Full-text available
Los bosques del Chaco semiárido se encuentran bajo explota�ción forestal y ganadera creciente, desde comienzos del siglo pasado. El incremento de la población y la demanda de re�cursos naturales han producido cambios en los patrones de explotación y en las unidades de vegetación que proveen ma�terias primas. Muchas de las intervenciones humanas r...
Book
Full-text available
Este es el segundo de muchos números. This is a journal/magazine on technical aspects on "Wildfires and other Natural Risks". This has also position papers, informative research texts in these topics and reviews of books and people in these fields. The language is Spanish. Esta es una revista sobre aspectos técnicos sobre "Incendios y otros Riesgos...
Article
Full-text available
Aunque los pastizales/sabanas del Chaco Semiárido sudamericano se han lignificado masivamente, la ecología del fenómeno es poco conocida y las iniciativas de restauración son casi inexistentes. Aportamos información sobre: 1) las diferencias en la estructura y la diversidad vegetal a lo largo de un gradiente de lignificación, y 2) la asociación de...
Book
Full-text available
Este es el número 5. This is issue 5. This is a journal/magazine on technical aspects on "Wildfires and other Natural Risks". This has also position papers, informative research texts in these topics and reviews of books and people in these fields. The language is Spanish. Esta es una revista sobre aspectos técnicos sobre "Incendios y otros Riesgos...
Book
Full-text available
Este es el número 6. This is issue 6. This is a journal/magazine on technical aspects on "Wildfires and other Natural Risks". This has also position papers, informative research texts in these topics and reviews of books and people in these fields. The language is Spanish. Esta es una revista sobre aspectos técnicos sobre "Incendios y otros Riesgos...
Article
Full-text available
The objective of this study was to analyze the root distribution of grasses and shrubs, at different soil depths, in two ecological sites (ES): highland (forest) and lowland (grassland). The root density (RD) estimation was used as a proxy to test the two-layer hypothesis. Three trenches were dug in both ES and the number of roots m�2 was registere...
Article
Full-text available
The grasslands/savannahs in South American Semiarid Chaco have been massively transformed into shrublands. However, the ecology of this phenomenon is little known and restoration initiatives almost non-existent. Information is provided regarding 1) the differences in plant structure and diversity along a woody encroachment gradient, and 2) the asso...
Book
Full-text available
Este es el número 4. This is issue number 4. This is a journal/magazine on technical aspects on "Wildfires and other Natural Risks". This has also position papers, informative research texts in these topics and reviews of books and people in these fields. The language is Spanish. Esta es una revista sobre aspectos técnicos sobre "Incendios y otros...
Article
Full-text available
Abstract. A contribution to the understanding of the woody encroachment in grasslands/savannas from the South American Semiarid Chaco. The grassland/savannas in the South American Semiarid Chaco have been massively transformed into shrubland. However, the ecology of this phenomenon is li�le known and restoration initiatives almost non-existent. We...
Book
Full-text available
Este es el 3 numero. This is issue number 3. This is a journal/magazine on technical aspects on "Wildfires and other Natural Risks". This has also position papers, informative research texts in these topics and reviews of books and people in these fields. The language is Spanish. Esta es una revista sobre aspectos técnicos sobre "Incendios y otros...
Thesis
Full-text available
El incremento de la biomasa aérea, cobertura y densidad de las especies leñosas, especialmente arbustivas, en detrimento de las gramíneas y eventualmente otros grupos funcionales, es un proceso muy común en ambientes subhúmedos a áridos. La coexistencia pastos-arbustos puede ser explicada mediante distintos mecanismos ecológicos, agrupados bajo dos...
Article
Full-text available
Prosopis pugionata (Fabaceae) is a halophyte tree species that grows exclusively in Argentina's arid environments, whose woodlands are mainly affected by fires and overgrazing. Here, we describe the wood anatomy and fire wounds of P. pugionata and their relationship with plant size and bark thickness. Besides, we attempt to determine the potential...
Article
In tropical dry forests, fire is a common disturbance and seed traits may drive regeneration of plant populations during these events. In this study, we aimed to (i) investigate whether the seed coat and/or fruit endocarp impose physical dormancy, (ii) check whether physical dormancy confers seed tolerance to heat shocks and (iii) verify whether he...
Article
Full-text available
Resprouting is one of the main regeneration strategies in woody plants that allows post-fire vegetation recovery. However, the stress produced by fires promotes the biosynthesis of compounds which could affect the post-fire resprouting, and this approach has been poorly evaluated in fire ecology. In this study, we evaluate the changes in the concen...
Book
Full-text available
Este es el número 1. This is issue 1. Una estrategia diferente: hacia comunidades más resilientes al cambio global. Una revista independiente de la comunidad internacional de riesgos naturales en español Diciembre 2020 / Núm 1 This is a journal/magazine on technical aspects on "Wildfires and other Natural Risks". This has also position papers, inf...
Conference Paper
Full-text available
Fire has effects on diverse aspects of plant functioning and development, many of them linked to survival. However, the response of native vegetation to this disturbance possibly reveals a plant strategy to tolerate fire linked to the biosynthesis of compounds such as chlorophylls and secondary metabolites. The aim of this study was to evaluate whe...
Presentation
Full-text available
Charla en el Seminario del Día Mundial del Ambiente. Facultad de Ciencias Forestales, UNSE. Argentina
Article
Full-text available
Este artículo de divulgación es un emergente del Simposio Rol ecológico y evolutivo del fuego sobre los ecosistemas argentinos realizado en el marco de las 37º Jornadas Argentinas de Botánica, el 10 de septiembre de 2019, en San Miguel de Tucumán, Argentina. Las personas usualmente conciben los incendios como catástrofes naturales, con efectos neg...
Article
Full-text available
Prosopis ruscifolia is a promising forest species for restoration of saline areas that produces high quality wood and nutraceutical interest fruits. Its germination requirements and optimal storage conditions are unknown. The objectives of the work were 1) to evaluate different methods to stimulate germination, 2) to establish if there is an intera...
Article
Over the last two decades, the Chaco region has experienced accelerated land-conversion processes that have developed into a mosaic of disturbances attributable to fires, forest logging, and livestock grazing in its native forests. In this paper, we describe the species composition and structure of two forests in semi-arid Argentine Chaco. Both for...
Article
Forests have resistance that allows them to resist fires without changing to another state, and resilience that allows them to recover after disturbance. These properties are determined by many structural and functional determinants that interact between them. Despite the importance of structural resistance and functional resilience to wildland fir...
Article
Full-text available
Plant traits—the morphological, anatomical, physiological, biochemical and phenological characteristics of plants—determine how plants respond to environmental factors, affect other trophic levels, and influence ecosystem properties and their benefits and detriments to people. Plant trait data thus represent the basis for a vast area of research sp...
Chapter
The Dry Chaco is mostly known as a forested ecosystem. However it includes natural grasslands, savannas, scrublands, and wetlands. With one of the highest global deforestation rates in the last two decades and only 12% of the area protected, the concern about land-use change in this ecoregion has raised exponentially; but conservation initiatives d...
Book
Full-text available
La actividad forestal en los bosques nativos de Argentina se ha caracterizado por ser altamente extractiva y selectiva, ocasionando una perdida de diversidad asociada a estos recursos. Especies como algarrobo blanco, araucaria o peteribí son relevantes, particularmente en las ecorregiones de Parque Chaqueño y Selva Paranaense, por sus característic...
Article
Full-text available
Los incendios forestales han sido percibidos durante las primeras décadas del siglo pasado como un evento de consecuencias siempre negativas para el ambiente. Esta percepción ha variado desde entonces, con el avance de estudios de ecología de fuego en diferentes ecosistemas del planeta y la consideración de los diversos parámetros que definen el ré...
Article
Full-text available
Los incendios forestales han sido percibidos durante las primeras décadas del siglo pasado como un evento de consecuencias siempre negativas para el ambiente. Esta percepción ha variado desde entonces, con el avance de estudios de ecología de fuego en diferentes ecosistemas del planeta y la consideración de los diversos parámetros que definen el ré...
Article
Full-text available
The objectives of this work were to estimate the ABB (Aerial Bud Bank) size in small individuals of four native woody species and its relationship with structural changes of plants after disturbances. Study area was located in dry forests from Western Chaco region, Argentina. Three tree species: Aspidosperma quebracho-blanco (Apocynaceae), Schinops...
Conference Paper
Full-text available
Roller chopping is a mechanical disturbance widely used in the Chaco region for developing silvopastoral systems. It is viewed with distrust because it is not selective, and may simplify the woody vegetation, unbalancing some ecological processes and causing degradation. The aims of this research were: (a) to explore the possibilities of the Tucker...
Conference Paper
Full-text available
Our purpose was to describe the quantitative attributes of the ‘reference condition’ of the ‘forest’ type of native vegetation of the Chaco, and to compare it using ecological statistical techniques with other three woody communities of the region to assess changes. The reference condition was selected in the INTA EEA Santiago del Estero Experiment...
Chapter
Full-text available
La capacidad de resiliencia de la vegetación nativa, frente al sinergismo entre disturbios plantea la necesidad de un enfoque funcional para fortalecer los planes de manejo forestal, la restauración o rehabilitación de áreas degradas, así como las actividades para mitigación frente al cambio climático. Actualmente, en el marco del Proyecto de Coope...
Article
Full-text available
Shrub encroachment is frequent in grazing lands in the Chaco region, Argentina. Fire is used by cattlemen to reduce the dominance of the shrub stands, improve forage standing biomass and quality, and enhance grazing accessibility. In this research, we assessed the combined effect of roller chopping þ fire on the plant canopy of three native shrub s...
Article
Full-text available
Moisture content of live fuels (LFMC) is one of the main factors determining fuel flammability and, therefore, a key indicator of fire danger. In this study, we modeled the relationship between spectral indices derived from satellite imagery and field estimations of LFMC in the Chaco Serrano subregion; then, we analyzed the relationship between fir...
Conference Paper
Full-text available
El presente estudio propone evaluar la inflamabilidad de especies leñosas nativas de bosques del Chaco semiárido mediante la estimación de parámetros morfológicos y analizar cambios estacionales en la inflamabilidad durante la temporada de fuego, en bosques con diferentes historias de disturbio. Se evaluó grado de ramificación, tiempo de secado de...
Article
Full-text available
Prosopis ruscifolia is a pioneer tree species in flooding or saline areas. The aim of this work was to assess anatomical changes in roots and hypocotyls of P. ruscifolia seedlings induced to saline stress under controlled conditions. Seeds, collected in natural forests of Western Chaco region in Argentina, were sown on paper towels moisturized with...
Article
Full-text available
Prosopis ruscifolia is a pioneer tree species in flooding or saline areas. The aim of this work was to assess anatomical changes in roots and hypocotyls of P. ruscifolia seedlings induced to saline stress under controlled conditions. Seeds, collected in natural forests of Western Chaco region in Argentina, were sown on paper towels moisturized with...
Presentation
Full-text available
Nota de difusión en revista RIA- Revista de Investigaciones Agropecuarias Vol 42, n°1, pp 14-19
Presentation
Full-text available
Nota de difusión en revista RIA- Revista de Investigaciones Agropecuarias Vol 42, n°1, pp 14-19
Presentation
Full-text available
Nota de difusión en revista RIA- Revista de Investigaciones Agropecuarias Vol 42, n°1, pp 14-19
Article
Full-text available
En la región chaqueña argentina, el desafío ya está planteado: lograr una producción ganadera y forestal sostenible en los ecosistemas naturales de la región. Para ello, los especialistas del INTA subrayan la necesidad de revertir los cambios en la vegetación original ocasionada como consecuencia de décadas de sobrepastoreo, exceso de fuego como he...
Chapter
Full-text available
The Chaco region is a vast plain extending over northwestern Argentina, Bolivia and Paraguay. Over the years, the woody component has increased in all vegetation communities of the Chaco. This poses a major problem for grassland productivity because the woody plants compete for resources with grass, impact advanced tree regeneration, hamper livesto...
Conference Paper
Full-text available
Se analizó el agroecosistema de familias de 7 comunidades de la central campesina “Cachi Mayu Centro” de Santiago del Estero, durante los años 2010-2013. Utilizando un diseño exploratorio-descriptivo, se indagó sobre el componente semilla: su procedencia, manejo y frecuencia entre los participantes, quienes compartieron material filogenético y cono...
Article
Full-text available
Fire is a common event in the Chaco region of Argentina. The fuel moisture content (CH, [%]) is a factor defining flammability. Its changes throughout time could be used as an index of fire risk, to understand fire ecology, and for planning the use of prescribed fire. We assessed CH dynamics in three ecological sites (˜fuel models): samples with El...
Chapter
Full-text available
In this chapter, we review some facts related to the ecology, history, and management of fire in the Chaco region of Argentina, South America. The Chaco is a fire prone ecosystem due to (a) the interplay of anticyclones and a low pressure center that results in cold and dry winters as well as rainy and hot summers, and (b) vegetation prone types ma...
Book
Full-text available
Este libro de difusión general aborda la importancia de los frutos de de especies leñosas nativas del Chaco Occidental de Argentina para la dispersión de las especies, el mantenimiento de las comunidades vegetales como fuente de diversidad y de forraje para fauna silvestre.
Conference Paper
Full-text available
Abstract The objectives of this research were to assess the response of seedlings pole-sized individuals of three native hardwood species: Aspidosperma quebracho-blanco Schlecht. Schinopsis lorentzii (Griseb.) Engler and Ziziphus mistol Griseb., to surface fires. We assessed thickness and density bark of the selected species as the main fire resis...
Chapter
Full-text available
The Chaco region is a vast plain that extends into northwestern Argentina and surrounding countries (Figure 1). Chaco is a quichua word meaning „a place for hunting‟ or „a place where I am self-sufficient‟ (Metraux 1946, Berton 2014, personal communication). Its northern limit is the Amazon. At the southeast, it limits with the Pampas, and to the s...
Article
Full-text available
Graphical abstract Mean char height of three native tree species of the Chaco region at two dates of burning during the fire season: early (July–August) and late (September–October), 2008–09. References: Ziziphus mistol (dotted bars), Aspidosperma quebracho-blanco (full bars) and Schinopsis lorentzii (diagonal lines bars). La María’ Experimental Ra...
Article
Full-text available
Fire is a common disturbance in the Chaco region of Argentina. The fuel moisture content (CH, [%]) is a factor defining inflammability and its changes throughout time. CH could be used to understand the fire regime and ecology, planning the use of prescribed fire and as an index of fire risk. In this research we assessed the dynamics of CH of the f...
Article
Full-text available
Fire is one of the main natural disturbances that have shaped most of the world's terrestrial ecosystems. In the Chaco region of Argentina, fire has also been used as a management tool for pastures improvement. Given an ignition source, for a fire to develop certain conditions must occur. Among them, the fuel moisture content (FMC) plays a very imp...
Article
Full-text available
El fuego es un modelador de la mayoría de los ecosistemas vegetales del mundo, entre ellos, los correspondientes a la región chaqueña argentina donde asimismo ha sido usado ampliamente como una herramienta de manejo de la vegetación. Dada una fuente de ignición, para que un fuego pueda prosperar deben existir ciertas condiciones. Entre ellas, el co...
Article
Full-text available
Dinámica de la humedad de los combustibles y su relación con la ecología y el manejo de fuego en la región chaqueña occidental (Argentina) I: conceptos básicos Recibido el 03 de septiembre de 2013 // Aceptado el 30 de mayo de 2014 // Publicado online el 18 de junio de 2014 del combustible (CH) juega un rol fundamental ya que su magnitud influirá en...
Article
Full-text available
Fire is a common disturbance in the Chaco region of Argentina. The fuel moisture content (CH, %) is a factor defining inflammability and its changes throughout time. CH could be used to understand the fire regime and ecology, planning the use of prescribed fire and as an index of fire risk. In this research we assessed the dynamics of CH of the fol...
Article
Full-text available
Vegetation states with low suitability for cattle raising (‘woody states’) are widespread in the Chaco region (NW Argentina). We assessed the success of roller-chopper (RR); roller-chopper with seeding of Panicum maximum cv green panic (RS), and roller chopper followed by prescribed fire (RF) in disrupting a woody state in two separate experiments,...
Article
Full-text available
El comportamiento del fuego es uno de los componentes de la ecologia del fenomeno y su caracterizacion es necesaria para su manejo y control. El objetivo de este trabajo fue caracterizar el comportamiento del fuego en un pastizal ubicado en el sitio ecologico 'media loma' ubicado en el Campo Experimental 'La Maria', INTA EEA Santiago del Estero (28...
Article
Full-text available
e objective of this work was to evaluate seed coat physical treatments and different substrates on germination of Prosopis kuntzei. Physical treatments included seed coat nicking, mechanical scarification, room temperature water soaking and soaking in boiling water followed by cooling to room temperature. Treated and control seeds were sown on pap...
Article
Full-text available
We used dendroecological techniques to date fire scars in woody species growing in a subtropical savanna of the Argentine Chaco dry forests, and to explore the temporal trends of fire with rainfall variability at different temporal scales during the 20th century. Eight sampling sites were located along an ecotone between savanna and a dry forest, a...
Article
Full-text available
SUmmAry This study examined anatomical responses to fire damage of the cam-bium in Schinopsis lorentzii and Aspidosperma quebracho-blanco. Bole cross sections were extracted from specimens with external signs of fire damage. Samples were taken from zones designated normal, discoloured and wound altered. The vessel, fibre, axial and ray paren-chyma...
Presentation
Full-text available
The goal of the conference is REGULATING THE FIRE PROBLEM BY THE WISE USE OF FIRE. This conference is targeted (but not limited) to European and national policy makers and representatives of agencies and organizations for forest and land management and fire protection. Towards Integrated Wildland Fire Management - Outcomes of the European Projects...