INVESTIGADORES
SOLER ESTEBAN Rosina Matilde
congresos y reuniones científicas
Título:
Impact of forest management on Misodendrum and Usnea productivity in Nothofagus forests in Tierra del Fuego.
Autor/es:
SOLER ESTEBAN, ROSINA MATILDE; MARTÍNEZ PASTUR, GUILLERMO; LENCINAS, MARIA VANESSA
Lugar:
San Carlos de Bariloche
Reunión:
Congreso; VI Southern Connection Congress; 2010
Resumen:
Misodendrum (M) is endemic of subantartic forests while Usnea (U) is widely distributed. Both are characteristic of Nothofagus forests in Patagonia, where harvesting could affect those populations. The aim was monthly quantify biomass fall of U and M during 2-3 years in primary-P, secondary-J and managed forests (dispersed-D and aggregated-A retention, and silvopastoral-S) of N. pumilio (lenga) and N. antarctica (ñire) forests. Ten biomass traps were placed in 21 stands and data was analyzed with ANOVAs. In lenga forests, U and M biomass varied among treatments (F=14.9 p<0.01, F= 8.8 p<0.01) and years (F=48.3 p<0.01, F=49.5 p<0.01). Only M showed monthly diferences (F=15.6 p<0.01). Largest biomass of U was in P (31.1 kg.ha-1.year-1) but M was in A (73.8 kg.ha-1.year-1). When biomass production was standardized with basal area, there was greater production of U in P and A than in D, while M was greatest in harvested stands. In ñire forests, only the U biomass varied among treatments (F=20.8 p<0.01) and years (F=27.7 p<0.01), being higher in P and S (40.5 kg.ha-1.year-1). There were monthly variations for U (F= 4.7 p<0.01) and M biomass (F= 12.5 p<0.01). Monthly, the biomass fall was higher at the beginning of growing season in lenga (U: 3.4 kg.ha-1, M: 7.1 kg.ha-1) and ñire forests (U: 5.8 kg.ha-1, M: 51.1 kg.ha-1). Mature forests present more Usnea biomass than harvested or secondary forests; while Misodendrum biomass increase with disturbance degree in N. pumilio stands.