The vegetation of the Puna Belt at laguna de Pozuelos Biosphere Reserve in northwest Argentina |
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Authors: | Stella Maris Bonaventura Rodolfo Tecchi Dorita Vignale |
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Affiliation: | (1) Dto. de Biología, Facultad de Cs. Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón II, Piso 4to., 1428 Buenos Aires, Argentina;(2) Instituto de Biología de la Altura, Universidad Nacional de Jujuy, Bolivia 2335, 4600 San Salvador de Jujuy, Argentina;(3) Facultad de Ciencias Agrarias, Universidad Nacional de Jujuy, Alberdi 47, 4600 San Salvador de Jujuy, Argentina |
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Abstract: | The presence of species and their cover values together with soil and topographic characteristics were recorded at 40 sites along an altitudinal gradient of the Puna Belt at Pozuelos, in the High Andes in northwest Argentina. Classification and ordination of plant assemblages showed that soil and topography were the best predictors of the variation in species distribution. The different plant assemblages which occur along the topographic gradient follow the geographic variation in rainfall in this Andean region. Perennial bushes and grasses colonize the plains and slopes with fine textured soils which retain their water content. In contrast, deciduous bushes and cactuses grow on steep, rocky, dry slopes. Open woods also occur on east-facing steep, rocky slopes which are sheltered from winds. |
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Keywords: | Classification Plant community type Plant distribution Principal Components Analysis Soil type |
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