RT info:eu-repo/semantics/article
T1 A floresta tropical seca, caatinga: As certezas e incertezas das águas
A1 Andrade, Eunice Maia de
A2 Ediciones Universidad de Valladolid
K1 Investigación
AB The brazilian semi-arid is not characterized by a small rainfall depth, but by how uncertain the events are, the frequency of extreme events (droughts and floods), annual evaporation rate (1,500 mm – 3,000 mm) and crystaline base. The rainfall depth of 750 mm/year characterizes it as one of the rainiest semi-arids in the world. Due to the proximity to the equator, altitude and geology, its drainage is almost composed by ephemerous or intermitent rivers. The soil-climate interaction in the evolution process and adaptation to the natural conditions of the place resulted in the appearance of the Caatinga Biome, which has an area of 844000 km2, corresponding to 86% of the Brazillian semi-arid. The caatinga presents high biodiversity and endogenous species adapted to the climactic conditions of the tropical semi-arid. Of the more than 1700 vegetation species (trees and brush) catalogued to the present day, 19% of them are endogenous. The uncertainties of the hydrological regime, together with its geological base, are the reason for the formation of an intense network of artificial reservoirs (2,660 lakes with surface area > 20 ha) for supplying the water needed for multiple uses. This network of reservoirs is what contributed to make this region one of the dry regions with highest demographic density in the world, approximately 27 million inhabitants, which exerts a high pressure on the natural resources. Such a fact leads to the need for studies which focus on understanding the uncertainties of the hydrological processes in the tropical dry forest, the caatinga
SN 2173-8947
YR 2017
FD 2017
LK http://uvadoc.uva.es/handle/10324/23593
UL http://uvadoc.uva.es/handle/10324/23593
LA spa
NO TRIM: revista de investigación multidisciplinar, 2017, N.12, pags.11-20
DS UVaDOC
RD 27-abr-2024