Natural dynamics and thinning response of young lenga (Nothofagus pumilio) trees in secondary forests of Southern Patagonia

For saw-log production, planned thinning in secondary forests may reduce the time to yield products of a desired size and quality. To explore some options, long-term monitoring plots were established in 1996 in two secondary stands of Nothofagus pumilio (19,300 stems ha-1, age 34 years and 18,300 st...

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Autores principales:	Peri,Pablo L, Martínez Pastur,Guillermo, Monelos,Lucas
Lenguaje:	English
Publicado:	Universidad Austral de Chile, Facultad de Ciencias Forestales 2013
Materias:	crown class dynamic mortality rate stability silviculture
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-92002013000300003
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spelling	oai:scielo:S0717-920020130003000032014-01-14Natural dynamics and thinning response of young lenga (Nothofagus pumilio) trees in secondary forests of Southern PatagoniaPeri,Pablo LMartínez Pastur,GuillermoMonelos,Lucas crown class dynamic mortality rate stability silviculture For saw-log production, planned thinning in secondary forests may reduce the time to yield products of a desired size and quality. To explore some options, long-term monitoring plots were established in 1996 in two secondary stands of Nothofagus pumilio (19,300 stems ha-1, age 34 years and 18,300 stems ha-1, age 40 years) in Santa Cruz province, Argentina. The study quantified growth responses to different thinning intensities around crop trees in the understory stratum of a two-aged stand, and growth dynamics in a natural unthinned stand regenerated by strip clearcutting. For the analysis of natural dynamics, growth, mortality and shift of crown classes of all trees were measured annually during 10 years. For thinning, 1,111 crop trees per hectare were selected. Thinning consisted of four intensities: elimination of one (T1), two (T2) and all (Tt) effective competitors, and a control (Tc). Each treatment was replicated ten times in a split plot design, where the main plots in this two-aged stand were three different levels of canopy covered by the remaining overstory seed trees (0, 12 and 33 %). The stand dynamics among unthinned plots revealed that competition-induced mortality occurred at a mean rate of 680 trees ha-1 year-1 (3.5 % of all trees) and mean growth rate of 7.2 m³ ha-1 year-1. Ten-year results from the thinned plots indicated a significant difference in the growth response of crop trees among treatments; being higher for Tt and T2, and under 12 % canopy cover. Thinning also reduced windthrow because it removed only the effective competitors and maintained a high stocking among crop trees. That offered mutual protection within the understory stratum.info:eu-repo/semantics/openAccessUniversidad Austral de Chile, Facultad de Ciencias ForestalesBosque (Valdivia) v.34 n.3 20132013-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-92002013000300003en10.4067/S0717-92002013000300003
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	crown class dynamic mortality rate stability silviculture
spellingShingle	crown class dynamic mortality rate stability silviculture Peri,Pablo L Martínez Pastur,Guillermo Monelos,Lucas Natural dynamics and thinning response of young lenga (Nothofagus pumilio) trees in secondary forests of Southern Patagonia
description	For saw-log production, planned thinning in secondary forests may reduce the time to yield products of a desired size and quality. To explore some options, long-term monitoring plots were established in 1996 in two secondary stands of Nothofagus pumilio (19,300 stems ha-1, age 34 years and 18,300 stems ha-1, age 40 years) in Santa Cruz province, Argentina. The study quantified growth responses to different thinning intensities around crop trees in the understory stratum of a two-aged stand, and growth dynamics in a natural unthinned stand regenerated by strip clearcutting. For the analysis of natural dynamics, growth, mortality and shift of crown classes of all trees were measured annually during 10 years. For thinning, 1,111 crop trees per hectare were selected. Thinning consisted of four intensities: elimination of one (T1), two (T2) and all (Tt) effective competitors, and a control (Tc). Each treatment was replicated ten times in a split plot design, where the main plots in this two-aged stand were three different levels of canopy covered by the remaining overstory seed trees (0, 12 and 33 %). The stand dynamics among unthinned plots revealed that competition-induced mortality occurred at a mean rate of 680 trees ha-1 year-1 (3.5 % of all trees) and mean growth rate of 7.2 m³ ha-1 year-1. Ten-year results from the thinned plots indicated a significant difference in the growth response of crop trees among treatments; being higher for Tt and T2, and under 12 % canopy cover. Thinning also reduced windthrow because it removed only the effective competitors and maintained a high stocking among crop trees. That offered mutual protection within the understory stratum.
author	Peri,Pablo L Martínez Pastur,Guillermo Monelos,Lucas
author_facet	Peri,Pablo L Martínez Pastur,Guillermo Monelos,Lucas
author_sort	Peri,Pablo L
title	Natural dynamics and thinning response of young lenga (Nothofagus pumilio) trees in secondary forests of Southern Patagonia
title_short	Natural dynamics and thinning response of young lenga (Nothofagus pumilio) trees in secondary forests of Southern Patagonia
title_full	Natural dynamics and thinning response of young lenga (Nothofagus pumilio) trees in secondary forests of Southern Patagonia
title_fullStr	Natural dynamics and thinning response of young lenga (Nothofagus pumilio) trees in secondary forests of Southern Patagonia
title_full_unstemmed	Natural dynamics and thinning response of young lenga (Nothofagus pumilio) trees in secondary forests of Southern Patagonia
title_sort	natural dynamics and thinning response of young lenga (nothofagus pumilio) trees in secondary forests of southern patagonia
publisher	Universidad Austral de Chile, Facultad de Ciencias Forestales
publishDate	2013
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-92002013000300003
work_keys_str_mv	AT peripablol naturaldynamicsandthinningresponseofyounglenganothofaguspumiliotreesinsecondaryforestsofsouthernpatagonia AT martinezpasturguillermo naturaldynamicsandthinningresponseofyounglenganothofaguspumiliotreesinsecondaryforestsofsouthernpatagonia AT moneloslucas naturaldynamicsandthinningresponseofyounglenganothofaguspumiliotreesinsecondaryforestsofsouthernpatagonia
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Natural dynamics and thinning response of young lenga (Nothofagus pumilio) trees in secondary forests of Southern Patagonia

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