Mesoclimas de pastizales de la Sierra de la Ventana
This study was conducted to recognize local differences in climate, between the main grassland types in the Sierra de la Ventana, Argentina. We compared 6 sites with different elevation, slope and aspect in a W-E attitudinal transect (400-1100 m asl). Simultaneous hourly data were registered during selected representative days of every season. The climatic variables measured were: air temperature, relative humidity, atmospheric saturation deficit pressure, light intensity, wind velocity, air evaporative capacity, and soil temperature. PCA was applied for seasonal and annual comparison of sites. We concluded that the sites showed sufficient climatic differences to recognize 6 mesoclimates. The greatest dissimilarity occurred between lowland and mountain sites. The former were warm, anisothermic and showed higher diurnal evaporative capacity. Steep SW slopes were similar to the lowland sites in summer, but in the other seasons were cold, isothermic, very humid and received low radiation; they seemed more continental. Mountain summits and high ridges showed extreme climatic conditions: they were colder, windy, and had the highest evaporative air capacity, reduced in winter because of the high cloudiness enclosing them. NE and SW gentle slopes showed intermediate conditions between the upper and lower sites; both sites showed differences that were clearly related to aspect. The temperature gradient observed support the existence of an altitudinal bioclimatic unit, a montane belt located above 750 m asl, unique in the province of Buenos Aires.
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Asociación Argentina de Ecología
1995
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Kristensen, María Julia Frangi, Jorge L. |
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Kristensen, María Julia Frangi, Jorge L. Mesoclimas de pastizales de la Sierra de la Ventana |
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Kristensen, María Julia Frangi, Jorge L. |
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Kristensen, María Julia |
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Mesoclimas de pastizales de la Sierra de la Ventana |
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Mesoclimas de pastizales de la Sierra de la Ventana |
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Mesoclimas de pastizales de la Sierra de la Ventana |
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Mesoclimas de pastizales de la Sierra de la Ventana |
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Mesoclimas de pastizales de la Sierra de la Ventana |
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mesoclimas de pastizales de la sierra de la ventana |
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This study was conducted to recognize local differences in climate, between the main grassland types in the Sierra de la Ventana, Argentina. We compared 6 sites with different elevation, slope and aspect in a W-E attitudinal transect (400-1100 m asl). Simultaneous hourly data were registered during selected representative days of every season. The climatic variables measured were: air temperature, relative humidity, atmospheric saturation deficit pressure, light intensity, wind velocity, air evaporative capacity, and soil temperature. PCA was applied for seasonal and annual comparison of sites. We concluded that the sites showed sufficient climatic differences to recognize 6 mesoclimates. The greatest dissimilarity occurred between lowland and mountain sites. The former were warm, anisothermic and showed higher diurnal evaporative capacity. Steep SW slopes were similar to the lowland sites in summer, but in the other seasons were cold, isothermic, very humid and received low radiation; they seemed more continental. Mountain summits and high ridges showed extreme climatic conditions: they were colder, windy, and had the highest evaporative air capacity, reduced in winter because of the high cloudiness enclosing them. NE and SW gentle slopes showed intermediate conditions between the upper and lower sites; both sites showed differences that were clearly related to aspect. The temperature gradient observed support the existence of an altitudinal bioclimatic unit, a montane belt located above 750 m asl, unique in the province of Buenos Aires. |
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Asociación Argentina de Ecología |
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1995 |
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https://ojs.ecologiaaustral.com.ar/index.php/Ecologia_Austral/article/view/1683 |
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AT kristensenmariajulia mesoclimasdepastizalesdelasierradelaventana AT frangijorgel mesoclimasdepastizalesdelasierradelaventana |
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rev-ecoaus-article-16832021-02-03T02:27:49Z Mesoclimas de pastizales de la Sierra de la Ventana Mesoclimas de pastizales de la Sierra de la Ventana Kristensen, María Julia Frangi, Jorge L. This study was conducted to recognize local differences in climate, between the main grassland types in the Sierra de la Ventana, Argentina. We compared 6 sites with different elevation, slope and aspect in a W-E attitudinal transect (400-1100 m asl). Simultaneous hourly data were registered during selected representative days of every season. The climatic variables measured were: air temperature, relative humidity, atmospheric saturation deficit pressure, light intensity, wind velocity, air evaporative capacity, and soil temperature. PCA was applied for seasonal and annual comparison of sites. We concluded that the sites showed sufficient climatic differences to recognize 6 mesoclimates. The greatest dissimilarity occurred between lowland and mountain sites. The former were warm, anisothermic and showed higher diurnal evaporative capacity. Steep SW slopes were similar to the lowland sites in summer, but in the other seasons were cold, isothermic, very humid and received low radiation; they seemed more continental. Mountain summits and high ridges showed extreme climatic conditions: they were colder, windy, and had the highest evaporative air capacity, reduced in winter because of the high cloudiness enclosing them. NE and SW gentle slopes showed intermediate conditions between the upper and lower sites; both sites showed differences that were clearly related to aspect. The temperature gradient observed support the existence of an altitudinal bioclimatic unit, a montane belt located above 750 m asl, unique in the province of Buenos Aires. El objetivo de este estudio fue reconocer diferencias climáticas, a escala local, entre biotopos edáficos ocupados por pastizales en las Sierras Australes (Buenos Aires, Argentina). Se establecieron 6 sitios de muestreo con distinta exposición y altitud entre 400-1100 m sm. Se efectuaron registros horarios simultáneos de temperatura, humedad relativa, déficit de saturación, capacidad evaporante, intensidad de luz, velocidad del viento y temperatura edáfica durante días elegidos representativos de cada estación. Mediante análisis de componentes principales se establecieron las relaciones mesoclimáticas anual y estacionales entre los sitios. Se concluyó que los sitios presentan diferencias climáticas suficientes para reconocer 6 mesoclimas. La mayor diferencia se observó entre los sitios banales y los propiamente serranos. Las planicies banales fueron las más cálidas, anisotermas y de mayor evaporación diurna; la intraserrana mostró temperaturas menos extremas y mayores precipitaciones que la periserrana. Los faldeos sudoccidentales abruptos fueron frescos y más isotermos, húmedos y umbríos la mayor parte del año; sólo en verano recibieron fuerte insolación y exhibieron una marcada variación diaria de condiciones -que los asemeja a los sitios basales-aparentando un efecto de mayor continentalidad. La parte superior de la sierra mostró características extremas: es fría, ventosa y con una elevada capacidad evaporante del aire, reducida en invierno por la frecuente nubosidad que la cubre. Las divisorias secundarias, de pendientes suaves y moderadas bien asoleadas, al NE y SW presentaron condiciones intermedias a aquellas de los pastizales a mayor y menor altitud. En ellas la exposición determinó diferencias en la marcha diaria de las variables climáticas y en su comportamiento estacional. El gradiente térmico altitudinal permite proponer la existencia de una unidad bioclimática por encima de los 750 m sm: se trata de un piso montano, único en la provincia de Buenos Aires. Asociación Argentina de Ecología 1995-06-01 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artículos application/pdf https://ojs.ecologiaaustral.com.ar/index.php/Ecologia_Austral/article/view/1683 Ecología Austral; Vol. 5 No. 1 (1995); 055-064 Ecología Austral; Vol. 5 Núm. 1 (1995); 055-064 0327-5477 1667-7838 spa https://ojs.ecologiaaustral.com.ar/index.php/Ecologia_Austral/article/view/1683/1014 Derechos de autor 2021 Ecología Austral |