The effects of a regeneration felling on photosynthetic photon flux density and regeneration growth in a <Emphasis Type="Italic">Nothofagus pumilio</Emphasis> forest |
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Authors: | Juan Caldentey Helmut Mayer Manuel Ibarra Alvaro Promis |
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Institution: | 1.Departamento de Silvicultura,Universidad de Chile,Santiago,Chile;2.Meteorological Institute,Albert-Ludwigs-Universit?ty of Freiburg,Freiburg,Germany;3.Institute of Silviculture,Albert-Ludwigs-Universit?ty of Freiburg,Freiburg,Germany |
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Abstract: | Photosynthetic photon flux density (PPFD) during the growing season and regeneration growth (height and base stem diameter)
were investigated in two natural stands in the Patagonian region of Chile, one without silvicultural management and another
with a regenerative felling under a shelterwood system. PPFD was measured by means of fifteen sensors (quantum Li-190SA) installed
in each stand and distributed within three canopy openness grades. Four regeneration plots (1 m2) were established around each sensor. In each of the plots, the height and base diameter of ten labelled plants within the
upper regeneration layer were measured in the growing seasons 2001–2002 and 2002–2003. In the stand with regeneration felling
total PPFD in the growing season was 2.5–2.9 times higher than in the stand without intervention. In both stands, total PPFD
in the growing season increased by about 420 mmol/m2 when the relative canopy, which was in the range between 30 and 70%, was reduced by 10%. An identical behaviour was observed
for the height and base stem diameter increases reflecting a clear effect of intervention and canopy coverage on the magnitude
of PPFD received by the regeneration and its development. |
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Keywords: | Regeneration felling Photosynthetic photon flux density Regeneration Nothofagus pumilio Chilean Patagonia |
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