Consumo de agua del bosque subtropical semideciduo y de plantaciones forestales en el norte de misiones: un estudio comparativo a diferentes escalas

PIEDAD M. CRISTIANO; SABRINA A. RODRIGUEZ; PAULA I. CAMPANELLO; DÉBORA DI FRANCESCANTONIO; MARCELO KOSTLIN; FABIAN G. SCHOLZ; OSCAR A. LEZCANO; NORA MADANES; LAUREANO OLIVA CARRASCO; SANDRA J. BUCCI; CAROLINA TRENTINI; GUILLERMO GOLDSTEIN

PUERTO IGUAZU

Congreso; 4to Congreso Forestal Argentino y Latinoamericano; 2013

During the last three decades the area dedicated to forest plantations in Misiones province has increased from 80000 to 370000 has. However, the impacts of this activity on different spatial and temporal components of the hydrologic cycle have not been evaluated so far. We studied evapotranspiration (ET) at different scales from individual level to native ecosystem and forest plantations. In the field, the water consumption of individuals was estimated using the heat dissipation method. These measures were performed both for a native forest site within the Iguazu National Park and in forest plantations of three species in northern Misiones (Pinus taeda, Araucaria angustifolia and Eucalyptus grandis). In ecosystem level, the ET was monthly and annually characterized using the MODIS-Terra product for the 2000-2011 periods. At the level of individual, the ETMODIS was influenced by the size of the trees regardless of species. At the native ecosystem and plantations level, ETMODIS and canopy conductance (gc) were determined by changes in the air saturation deficit (ASD). In all systems studied, the daily ETMODIS for each month increased with increasing ASD up to 0.8 kPa, a point at which the ETMODIS start to decrease due to likely stomatal control and low values of gc. Forest plantations, regardless of tree density or age had not higher ETMODIS than the native forest.