Polen Y Vegetación En La Patagonia Extraandina Argentina A 45º S

Abstract

Modern pollen dispersal and deposition in relation to vegetation and environmental variables at 45° S was studied in Argentinian Patagonia east of the Andes to build a modern pollen model. serve to identify modern pollen assemblages that are analog of past pollen assemblages. A west-to-east gradient of decreasing precipitation and increasing temperature determines four vegetation units: (1) grass steppe, (2) grass-bush steppe, (3) bush steppe and (4) bush-brush steppe. Pollen samples ordination methods, and correlated to environmental variables. The steppes (a) dominated by the functional type grass, (1) grass steppe, and (2) grass-bush steppe located in the more humid and cooler west end of the region bush-dominated steppes (3) bush steppe and (4) bush-brush steppe occurring in the central and eastern parts of the region, where conditions are drier and identified as halophytic bush gradient. Environmental variables related to vegetation distribution are temperature and interannual precipitation variability associated with the precipitation gradient from the cordillera to and soil salinity in the case of azonal communities.