Raul Gimenez

Raul Gimenez
Grupo de Estudios Ambientales IMASL/CONICET San Luis, Argentina

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About

18
Publications
5,899
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317
Citations
Additional affiliations
March 2012 - March 2016
Grupo de Estudios Ambientales IMASL/CONICET San Luis, Argentina
Position
  • Doctoral Fellow
May 2005 - March 2012
Universidad de Buenos Aires
Position
  • MSc Fellow

Publications

Publications (18)
Article
The Dry Chaco is a semi-arid ecoregion in South America that hosts one of the largest dry forests in the world, but expansion of dryland agriculture and cattle ranching led to gradual conversion of native vegetation to anthropogenic land cover. The potential impact of these newly established agricultural lands on the surrounding environment is of g...
Article
Full-text available
Land-use change has been the strongest driver of vegetation cover change in the world. In the South American Dry Chaco (~1 M km²; PPT/ET0 < 0.65), native dry forests are experiencing high deforestation rates that tend to continue in the coming years. Here, we used a hydrological model (Hydrus 1-D) to analyze changes in the water balance triggered b...
Chapter
Full-text available
We synthesize research on the magnitude and dynamisms of salt stocks in the Chaco-Pampas. While current soil maps characterize one-fourth of the region’s soils as saline; integrated soil-hydrology-vegetation studies show salinity to be more widespread and dynamic due to the presence of shallow and stagnant groundwater systems. Two salt retention me...
Article
Over the last decades, the rapid replacement of native forests by crops and pastures in the Argentinean semiarid Chaco plains has triggered unprecedented groundwater level raises resulting from deep drainage increases, leading to the first massive waterlogging event on records (~25.000 Ha flooded in 2015 near Bandera, one of the most cultivated clu...
Conference Paper
Machine learning has arisen with advanced data analytics. Many factors influence crop yield, such as soil, amount of water, climate, and genotype. Determining factors that significantly influence yield prediction and identify the most appropriate predictive methods are important in yield management. It is critical to consider and study the combinat...
Article
Full-text available
Soil evaporation is a dominant water flux of flat dry ecosystems, reducing available water for plant transpiration. Vegetation plays a key role at controlling evaporation, especially by altering soil surface micro-meteorological conditions. Here we explored the vegetation cover effect on soil evaporation, differentiating the effects of canopy cover...
Article
Full-text available
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 exist...
Article
Deforestation affects climate and the energy balance of the Earth not only through the release of greenhouse gases but also through shifts in the physical properties of the surface. These physical effects can be strongly dependent not only on the deforestation event but on the land use choices and management that follow it. Here we explored how the...
Article
Full-text available
Vegetation plays an important part in regulating water fluxes in ecosystems, specially in dry regions where a large fraction of precipitation is evapotranspirated. Here, we assessed how the replacement of native dry forests by pastures, with the aim of increasing livestock production, affects water flux partition in the Arid Chaco plains. We charac...
Article
Full-text available
The semiarid Chaco plains present one of the highest rates of forest clearing and agricultural expansion of the world. In other semiarid plains, such massive vegetation replacements initiated a groundwater recharge and salt mobilization process that, after decades, raised regional water tables and salts to the surface, degrading agricultural and na...
Article
Full-text available
Vegetation plays an important part in regulating water fuxes in ecosystems, specially in dry regions where a large fraction of precipitation is evapotranspirated. Here, we assessed how the replacement of native dry forests by pastures, with the aim of increasing livestock production, affects water fux partition in the Arid Chaco plains. We characte...
Article
In this paper we explored how aridity influences the regional deforestation and land-use patterns (i.e. crops/pastures) in South American Dry Chaco. To do this, we contrasted land use during last decade (2001–2012) with a spatially explicit aridity index, which we complemented with a crop water balance model. Land-use classifications were performed...
Conference Paper
The Gran Chaco is South America’s second largest forest after the Amazon, and is one of the fastest developing agricultural frontiers on the planet. The dry forest is being converted for corn and soybean production in an effort to meet growing global demand. This landuse conversion is triggering hydrologic change in the Chaco of northern Argentina....
Article
Like in other semiarid areas of the world, farming systems in semiarid Chaco tend to use water-conservative crop systems to minimize production risks associated to water stress. While this strategy aims to stabilize crop yields and farmers income, the underutilization of water resources in wet years may result in heavy deep drainage water losses wh...
Article
Full-text available
En la Región Pampeana la lluvia, y su elevada variabilidad, es la principal determinante de la producción agropecuaria (Hall et al., 1992) que motoriza la economía de muchos municipios. En los sistemas de producción pampeanos, en los que el riego es aún una práctica poco común, la escasez de lluvias resiente a la producción y propaga sus efectos en...
Article
The lifecycle of the facultative biennial oilseed-crop evening primrose (Oenothera biennis) is a major constraint for its commercial production under different growing conditions, as a variable proportion of plants fails to flower during the first season and remains as vegetative rosettes (biennial behavior). The aim of this work was to understand...

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Projects (2)
Project
Existe una necesidad general de comprender las inundaciones particularmente en el contexto actual de los cambios en el uso del suelo y el clima. Si bien históricamente, las inundaciones han sido percibidas como consecuencias de las influencias climáticas, en las dos últimas décadas ha emergido una imagen más recíproca, en la que los ecosistemas terrestres y las personas que los manejan pueden dejar una profunda huella en el sistema hidrológico (por ejemplo en la descarga en ríos y en niveles freáticos) (Viglizzo et al., 2009). Esto es particularmente importante llanuras sedimentarias como la Chaco-Pampeana donde, por un lado, las pérdidas evaporativas de agua son mucho más importantes que las pérdidas líquidas por lo tanto, cambios pequeños en el balance hídrico -dados por cambios de precipitación o cambios de cobertura de vegetal (partición vapor/líquido) o cambios en la temporalidad/estacionalidad de la cobertura vegetal (cultivos con ciclos distintos)- pueden producir efectos desproporcionalmente mayores en el sistema hidrológico. Por otro lado, se registran profundas alteraciones antrópicas del paisaje, deforestación en la región chaqueña (Houspanossian et al., 2016) y reemplazo de sistemas pastoriles por cultivos en la región pampeana (Viglizzo et al., 2009). Llamando la atención sobre los impactos de estos cambios hidrológicos sobre el rendimiento hídrico y las tasas de recarga freática (Jobbágy et al., 2008; Nosetto et al., 2012).