910 resultados para TOLERANCIA A LA HUMEDAD
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p.93-101
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p.125-132
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p.151-158
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New records of vascular plants from Sierra del Rincón Biosphere Reserve and surroundings (Spain, Madrid province) are provided. It is noteworthy the presence of atlantic flora in this continental area and the different shrubby communities in different sectors with different litology: in areas with gneiss they are dominated by leguminous genisteae; where it is schistous, shale or quartzite they are heathlands.
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Strong and sometimes extreme responses in runoff and soil erosion following wildfires have been reported worldwide. However, in the case of North-Central Portugal, little research had been carried out regarding the hydrologic and erosive impacts of several land management activities in recently burnt areas (such as ground preparation, post-fire logging or post-fire mitigation treatments). This study aims to assess post-fire runoff and soil erosion response on Eucalypt and Maritime pine plantations during the first, second and third years following wildfires. The effect of several pre-fire ground preparation operations (ploughed down-slope, contour ploughed and inclined terraces), post-fire logging activities (on both the eucalypt and pine plantations), as well as the application of hydromulch (a post-fire emergency treatment) on overland flow and soil erosion were compared to burnt but undisturbed and untreated areas. The intensive monitoring of runoff, soil erosion and selected soil properties served to determine the main factors involved in post-fire runoff and soil erosion and their spatial and temporal variation. Soil water repellency deserved special attention, due to its supposed important role for overland flow generation. Repeated rainfall simulation experiments (RSE’s), micro-scale runoff plots and bounded sediment fences were carried out and/or installed immediately after the wildfire on seven burnt slopes. Micro-scale runoff plots results under natural rainfall conditions were also compared to the RSE’s results, which was useful for assessing the representativeness of the data obtained with artificial rainfall. The results showed comparable runoff coefficient (20-60%) but lower sediment losses (125-1000 g m-2) than prior studies in Portugal, but especially outside Portugal. Lower sediment losses were related with the historic intensive land use in the area. In evaluating these losses, however, the shallowness and stoniness of the soils, as well as the high organic matter fraction of the eroded sediments (50%) must not be overlooked. Sediment limited erosion was measured in all the ploughed sites, probably due to the time since ploughing (several years). The disturbance of the soil surface cover due to post-fire logging and wood extraction substantially increased sediment losses at both the pine and eucalypt sites. Hydromulch effectiveness in reducing the runoff (70%) and sediment losses (83%) was attributed to the protective high coverage provided by hydromulch. The hydromulch significantly affected the soil cover and other soil properties and these changes also reduced the soil erosion risk. The rainfall amount was the main factor explaining the variance in runoff. However, a shift from rainfall amount to rainfall intensity was detected when either the surface cover or the infiltration capacity (hydrophilic conditions) increased. Sediment losses were controlled by rainfall intensity and surface cover. The role of soil water repellency on runoff generation was not consistent; the overall repellency levels alone were not enough to assess its hydrological impact. Soil water repellency explained runoff generation in the specific-sites model better than in the overall model. Additionally, soil moisture content was a better predictor for soil water repellency than antecedent rainfall. The natural rainfall results confirmed that RSE’s were able to capture the specific sediment losses and its organic matter content as well as the differences between the ploughed and unploughed sites. Repeated RSE’s also captured the seasonal variations in runoff and sediment losses attributed to soil water repellency. These results have implications for post-fire soil erosion modelling and soil conservation practices in the region, or areas with the same land use, climate and soil characteristics. The measured sediment loss, as well as the increasing frequency of ploughing in recently burnt and unburnt eucalypt stands, suggests ploughing is not an effective as a soil conservation measure. Logging activities with less impact are recommended in order to maintain the forest litter protecting the soil surface. Due to its high effectiveness in reducing runoff and soil erosion, hydromulch is recommended for highly sensitive and vulnerable areas.
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Muestra el examen de origen y naturaleza de álcali en las regiones semiáridas. Determina las relaciones entre el álcali, los suelos y la humedad mejorándolos en las zonas secas.
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Colección de diversas propuestas didácticas a través de juegos matemáticos planteados en estrecha correspondencia con los contenidos curriculares. Los juegos se dirigen especialmente a los alumnos que comienzan la enseñanza secundaria y pretenden la consolidación de conceptos matemáticos y la automatización de algoritmos de cálculo. Presentan, en la mayoría de los casos, un carácter cooperativo dentro del equipo, con lo que se potencia el aprendizaje entre iguales, la tolerancia y la colaboración. Cada uno de los juegos propuestos cuenta con información precisa para su aplicación y con plantillas para que puedan ser reproducidos fácilmente.
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Resumen basado en la publicación
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Seleccionado en la convocatoria: Ayudas a la innovación e investigación educativa en centros docentes de niveles no universitarios, Gobierno de Aragón 2009-10
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Ganador del primer premio de buenas pr??cticas en materia de convivencia, Gobierno de Arag??n 2009-10. Modalidad c
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Seleccionado en la convocatoria: Ayudas a la innovaci??n e investigaci??n educativa en centros docentes de niveles no universitarios, Gobierno de Arag??n 2010-11
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Seleccionado en la convocatoria: Ayudas a la innovación e investigación educativa en centros docentes de niveles no universitarios, Gobierno de Aragón 2008-09
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Resumen tomado de la publicaci??n
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Se reflexiona en torno a los objetivos de la Educaci??n Infantil. Se admite que la Educaci??n Infantil sienta las bases de la futura personalidad de los ni??os, por ello, la adquisici??n de la propia identidad debe partir del principio de igualdad entre ambos sexos, pero la coeducaci??n no se agota en educar en la igualdad sino que afecta a otros valores como el respeto mutuo, la tolerancia o la solidaridad. En el CP Valdellera de Posada de Llanes se trabaja desde una perspectiva globalizadora que intenta prevenir cualquier tipo de discriminaci??n.
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Se realizó un estudio transversal que contó con laparticipación de 51 personas VIH+ 100% adherentes,cuyo objetivo fue evaluar los efectos de unconjunto de variables psicológicas sobre la calidadde vida, en función del estadio clínico de infección.Para la dimensión salud física los resultados fueron:en el estadio clínico A se encontró un efecto de lascompetencias conductuales presentes (F [1, 13]= 13,372; p < 0,001); en el B, de bajos niveles deestrés vinculados con tolerancia a la ambigüedady tolerancia a la frustración (F [2, 17] = 19,648; p< 0,001), y en el C no se encontraron predictores.Para la dimensión salud psicológica los resultadosfueron: en el estadio A hubo un efecto de lascompetencias conductuales presentes (F [1, 13] =4,899; p < 0,05), en el B no hubo efecto de ningunavariable, mientras que en el C se presentó comorespuesta de bajos niveles de estrés, vinculado contolerancia a la ambigüedad (F [1, 14] = 4,906; p <0,05). El presente estudio sugiere que los efectosde diversas variables psicológicas sobre la calidadde vida en sus dimensiones de salud física y psicológica,ejercen un efecto diferenciado en funcióndel estadio clínico de infección. Se discuten algunasimplicaciones de los hallazgos para el diseño deprogramas de intervención interdisciplinaria dirigidosa mejorar tanto la adhesión a la terapéuticamédica, como la calidad de vida en personas VIH+