BECAS
DIAZ YÉsica Roxana
capítulos de libros
Título:
Salt Accumulation and Redistribution in the Dry Plains of Southern South America: Lessons from Land Use Changes
Autor/es:
JOBBÁGY, ESTEBAN G.; GIMENEZ, RAUL; MARCHESINI,VICTORIA A.; DIAZ, YÉSICA R.; JAYAWICKREME, DUSHMANTHA H.; NOSETTO MARCELO D.
Libro:
Saline and Alkaline Soils in Latin America
Editorial:
Springer, Cham
Referencias:
Año: 2020; p. 51 - 70
Resumen:
We synthesize research on the magnitude and dynamisms of salt stocks inthe Chaco-Pampas. While current soil maps characterize one-fourth of the region?ssoils as saline; integrated soil-hydrology-vegetation studies show salinity to be morewidespread and dynamic due to the presence of shallow and stagnant groundwatersystems. Two salt retention mechanisms that are turned ?off? or ?on? by land usechanges are proposed: ?arrested drainage? and ?landscape stagnation.? In the Chacoand Espinal, deforestation and cultivation have relaxed arrested drainage, raisingthe groundwater and bringing a diluted salt pool to the surface that damages crops and soils. Over the shallower and fresher water tables of the Pampas, tree plantationstrigger local arrested drainage and in the landscape stagnation context workas virtual lowlands, consuming groundwater and increasing salt pools. While landuse changes highlight the dominant role of vegetation dictating the dynamics of saltpools, key fundamental questions about long-term salt dynamics remain open. Rapidand widespread land use changes offered a unique laboratory to understand salineenvironments showing that they aremore dynamic and sensitive to our interventions,than previously thought.