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| Castellaro G,Giorgio; Aguilar G,Claudio; Vera I,Raul; Morales S,Luis. |
| Grasslands are complex ecosystems and their processes are affected by soil, meteorological, and management variables. In this context, dynamic simulation models are useful to understand these processes and to design grassland use strategies. The aim of this study was to develop and validate a simulation model of perennial pasture growth based on soil and climate variables. A first approach considered that soil fertility levels were adequate; therefore, soil water availability and phytomass level were the main variables affecting pasture growth. The subroutines considered were water balance, pasture growth, and root biomass dynamics. The hypotheses regarding the functioning of the system were formulated as a group of equations which were solved numerically... |
| Tipo: Journal article |
Palavras-chave: Grassland simulation models; Mesophytic grasslands. |
| Ano: 2012 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392012000300013 |
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| Castellaro G,Giorgio; Morales S,Luis; Ahumada,Mario; Barozzi,Azelio. |
| This paper describes a simulation model combining the main components of water balance and growth of perennial grassland steppe in Chilean Patagonia, to estimate long-term annual production (Yr, kg ha-1) and sheep carrying capacity (GC, sheep equivalent [EO] ha-1). The model is based on climate-water balance relationships, where the basic process is evapotranspiration. The model calculates Yr depending on the accumulation of transpiration and the water use efficiency from the time of growth initiation until the grassland accumulates the maximum amount of dry matter (DM). Depending on Yr, the DM requirement of EO, the proper use factor of grassland and a slope correction factor, a range site GC is calculated. Simulations were performed using actual climate... |
| Tipo: Journal article |
Palavras-chave: Grassland simulation models; Grazing capacity; Patagonian steppe range; Capacidad de carga; Modelos de simulación de praderas; Pastizales esteparios de la Patagonia. |
| Ano: 2010 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392010000300009 |
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| Díaz M,Diego; Morales S,Luis; Castellaro G,Giorgio; Neira R,Fernando. |
| Climatic mapping in the Bío Bío and La Araucanía Regions of Chile is primarily in analog form (paper) and delineation of contours, making it unsuitable for digital handling by geographic information systems (GIS). Therefore, in this study, topoclimatic models were created and spatially represented to explain the spatial and temporal variation of monthly mean temperature and precipitation, as a function of variability and singularity of the physiographic characteristics of the Bío Bío and La Araucanía Regions. The physiographic factors considered were latitude, longitude, altitude, aspect and distance to coastline. To elaborate equations, data from thermopluviometric stations of the study area were compiled and systematized. These stations were standardized... |
| Tipo: Journal article |
Palavras-chave: Topoclimatic models; Mean temperature; Mean precipitation; Pluviometric cartographic; GIS; Topoclimáticos; Temperaturas medias; Precipitaciones medias; Cartografía termopluviométrica; SIG. |
| Ano: 2010 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392010000400011 |
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