%0 Journal Article
%T Descomposici車n de hojarasca en rodales de Nothofagus pumilio de la regi車n de Magallanes Litter decomposition in Nothofagus pumilio stands in Magallanes Region
%A Manuel Ibarra
%A Juan Caldentey
%A 芍lvaro Promis
%J Bosque (Valdivia)
%D 2011
%I Universidad Austral de Chile
%X En dos rodales de un bosque lenga (Nothofagus pumilio) de la regi車n de Magallanes, uno sin intervenci車n (SI) y otro sometido a una corta de regeneraci車n (CR), se determinaron las tasas de descomposici車n de los restos org芍nicos (hojarasca) para un per赤odo de dos a os. En la estimaci車n de las p谷rdidas de peso y las constantes de descomposici車n se emplearon 36 bolsas de descomposici車n dispuestas sistem芍ticamente en cada rodal, las cuales fueron extra赤das a los 2, 5, 9, 11, 12, 15, 21, 22 y 24 meses despu谷s de instalado el ensayo. Las p谷rdidas de peso de la hojarasca mostraron diferencias importantes entre rodales s車lo al t谷rmino del primer a o; al finalizar el estudio las p谷rdidas de peso fueron semejantes, alcanzando valores cercanos al 60 %. Las constantes de descomposici車n (k), transcurrido el primer a o, presentaron valores de 0,76 en el rodal con CR y de 0,44 en el SI. Al t谷rmino del ensayo estos valores llegaron a 0,44 y 0,46 respectivamente. El modelo cuadr芍tico fue el que mejor se ajust車 (R2 = 0,95) para estimar la masa relativa de la hojarasca respecto al peso inicial en el tiempo (meses) en ambos rodales. Los resultados obtenidos sugieren que los efectos de la intervenci車n silvicultural sobre las tasas de descomposici車n de la hojarasca disminuyen con el transcurso del tiempo. Litter decomposition in two Nothofagus pumilio stands located in Magallanes Region (Chile) was studied during two years. One stand was a primary forest (SI), without silvicultural treatment, and the other had a regenerative felling under a shelterwood system (CR). Weight loss and litter decomposition rates were obtained with the litter-bag method. At each stand, 36 litter-bags were systematically placed on the forest floor. A fraction of the litter-bags was then randomly extracted at months 2, 5, 9, 11, 12, 15, 21, 22 and 24. The weight of the collected litter-bags was measured at each sampling period. Litter weight-loss presented differences between the stands only after 12 months since the litter-bag set up. After 24 months, the litter weight-loss was similar between the stands, reaching 60 % of the initial weight. After one year of the experimental set-up, litter decomposition rates (k) were 0.76 and 0.44 for CR and SI stands, respectively. At the end of the trial, these values changed to 0.44 and 0.46 for CR and SI stands, respectively. The model that best fitted the relative litter mass according to the initial litter weight was the quadratic regression model, using the number of months, when the litter was on the forest ground, as the independent variable (R2 = 0.95 fo
%K Nothofagus pumilio
%K descomposici車n de la hojarasca
%K p谷rdida de peso
%K corta de regeneraci車n
%K bosque virgen
%K Nothofagus pumilio
%K litter decomposition
%K weight loss
%K primary forest
%K regeneration felling
%U http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-92002011000300004