INVESTIGADORES
MARTINEZ PASTUR Guillermo Jose
congresos y reuniones científicas
Título:
Influence of site quality on macro nutrients concentration Nothofagus antarctica native trees in Southern Patagonia, Argentina
Autor/es:
PERI, P; V GARGAGLIONE; MARTÍNEZ PASTUR G
Lugar:
Brisbane (Australia) 8-13 Agosto
Reunión:
Congreso; XXII IUFRO World Congress; 2005
Institución organizadora:
IUFRO
Resumen:
Knowledge of the nutrients concentration in trees is essential to evaluate the positive and/or negative effects on pasture production in silvopastoral systems and nutrients export from the system by silviculture treatments. The aim of this work was to determine the nutrients percentage concentration for different components (leaves, small branches, whiteness, duramen, bark and roots) of individual Nothofagus antarctica trees grown in two site class (SC) in Southern Patagonia (51º 39´ SL; 72º 01´ WL). Samples of 102 trees were taken from SC IV (height of dominant trees, 7.8 m) and SC V (5.3 m). Total N, P, K, Ca, S and Mg concentrations were determined for each component. The concentration of all nutrients, except Mg, decreased in trees grown at SC V. For example, while the average concentration of K decreased from 3,58 % in SC IV to 1,82 % in SC V, Mg was higher in SC V (1,25 %). It was found an interaction in nutrient concentration between SC and components where leaves showed more sensitive responses (4,37 % in SC IV vs 3,0 % in SC V). In contrast, whiteness and duramen of trees grown at SC V had higher values than SC IV (0.80 % vs 0.56 % and 0.40 % vs 0.33 %, respectively).