NITROGEN FLUXES IN THROUGHFALL AND LITTERFALL IN TWO NOTHOFAGUS FORESTS IN SOUTHERN CHILE

Nitrogen return by leaf litterfall was compared with atmospheric nitrogen deposition for two deciduous Nothofagus stands in southern Chile, located in areas with contrasting land use. The litterfall return of nitrogen in a Nothofagus alpina (Poepp. et Endl.) Oerst. stand at San Pablo de Tregua, in t...

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Autores principales:	Staelens,Jeroen, Godoy,Roberto, Oyarzún,Carlos, Thibo,Karen, Verheyen,Kris
Lenguaje:	English
Publicado:	Facultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción 2005
Materias:	Ammonium atmospheric deposition canopy interactions nitrate nutrient cycling Amonio ciclos de nutrientes depositación atmosférica interacciones del dosel nitrato
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432005000200002
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spelling	oai:scielo:S0717-664320050002000022006-03-22NITROGEN FLUXES IN THROUGHFALL AND LITTERFALL IN TWO NOTHOFAGUS FORESTS IN SOUTHERN CHILEStaelens,JeroenGodoy,RobertoOyarzún,CarlosThibo,KarenVerheyen,Kris Ammonium atmospheric deposition canopy interactions nitrate nutrient cycling Amonio ciclos de nutrientes depositación atmosférica interacciones del dosel nitrato Nitrogen return by leaf litterfall was compared with atmospheric nitrogen deposition for two deciduous Nothofagus stands in southern Chile, located in areas with contrasting land use. The litterfall return of nitrogen in a Nothofagus alpina (Poepp. et Endl.) Oerst. stand at San Pablo de Tregua, in the Cordillera de los Andes, was similar to the litterfall return in a Nothofagus obliqua (Mirb.) Oerst. stand at Paillaco, in the Central Depression. In contrast, the net throughfall and stemflow deposition differed significantly between the two stands. At San Pablo de Tregua, the annual bulk deposition of NH4+ and NO3- was significantly higher than the throughfall and stemflow deposition reaching the forest floor. This demonstrates an uptake of inorganic nitrogen by the aboveground biomass, which was correlated with month-to-month variation in the bulk inorganic nitrogen deposition by precipitation (r² > 0.73). At Paillaco, the canopy uptake of nitrogen was not directly detectable due to an estimated dry deposition input of 4-8 kg inorganic N ha-1 y-1. In both stands, nitrogen return through leaf litterfall (~ 50 kg N ha-1 y-1) was much higher than the atmospheric N deposition load (< 10 kg N ha-1 y-1). The results consequently confirm the low level of atmospheric pollution in the forests of this region. However, the clear difference in net throughfall deposition of inorganic nitrogen between the two stands suggests that the external N input by dry deposition may be considerably higher in the Central depression than in Cordillera de los Andes. More emphasis on monitoring dry atmospheric N deposition is a necessary tool for evaluating the consequences of future emission changesinfo:eu-repo/semantics/openAccessFacultad de Ciencias Naturales y Oceanográficas, Universidad de ConcepciónGayana. Botánica v.62 n.2 20052005-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432005000200002en10.4067/S0717-66432005000200002
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Ammonium atmospheric deposition canopy interactions nitrate nutrient cycling Amonio ciclos de nutrientes depositación atmosférica interacciones del dosel nitrato
spellingShingle	Ammonium atmospheric deposition canopy interactions nitrate nutrient cycling Amonio ciclos de nutrientes depositación atmosférica interacciones del dosel nitrato Staelens,Jeroen Godoy,Roberto Oyarzún,Carlos Thibo,Karen Verheyen,Kris NITROGEN FLUXES IN THROUGHFALL AND LITTERFALL IN TWO NOTHOFAGUS FORESTS IN SOUTHERN CHILE
description	Nitrogen return by leaf litterfall was compared with atmospheric nitrogen deposition for two deciduous Nothofagus stands in southern Chile, located in areas with contrasting land use. The litterfall return of nitrogen in a Nothofagus alpina (Poepp. et Endl.) Oerst. stand at San Pablo de Tregua, in the Cordillera de los Andes, was similar to the litterfall return in a Nothofagus obliqua (Mirb.) Oerst. stand at Paillaco, in the Central Depression. In contrast, the net throughfall and stemflow deposition differed significantly between the two stands. At San Pablo de Tregua, the annual bulk deposition of NH4+ and NO3- was significantly higher than the throughfall and stemflow deposition reaching the forest floor. This demonstrates an uptake of inorganic nitrogen by the aboveground biomass, which was correlated with month-to-month variation in the bulk inorganic nitrogen deposition by precipitation (r² > 0.73). At Paillaco, the canopy uptake of nitrogen was not directly detectable due to an estimated dry deposition input of 4-8 kg inorganic N ha-1 y-1. In both stands, nitrogen return through leaf litterfall (~ 50 kg N ha-1 y-1) was much higher than the atmospheric N deposition load (< 10 kg N ha-1 y-1). The results consequently confirm the low level of atmospheric pollution in the forests of this region. However, the clear difference in net throughfall deposition of inorganic nitrogen between the two stands suggests that the external N input by dry deposition may be considerably higher in the Central depression than in Cordillera de los Andes. More emphasis on monitoring dry atmospheric N deposition is a necessary tool for evaluating the consequences of future emission changes
author	Staelens,Jeroen Godoy,Roberto Oyarzún,Carlos Thibo,Karen Verheyen,Kris
author_facet	Staelens,Jeroen Godoy,Roberto Oyarzún,Carlos Thibo,Karen Verheyen,Kris
author_sort	Staelens,Jeroen
title	NITROGEN FLUXES IN THROUGHFALL AND LITTERFALL IN TWO NOTHOFAGUS FORESTS IN SOUTHERN CHILE
title_short	NITROGEN FLUXES IN THROUGHFALL AND LITTERFALL IN TWO NOTHOFAGUS FORESTS IN SOUTHERN CHILE
title_full	NITROGEN FLUXES IN THROUGHFALL AND LITTERFALL IN TWO NOTHOFAGUS FORESTS IN SOUTHERN CHILE
title_fullStr	NITROGEN FLUXES IN THROUGHFALL AND LITTERFALL IN TWO NOTHOFAGUS FORESTS IN SOUTHERN CHILE
title_full_unstemmed	NITROGEN FLUXES IN THROUGHFALL AND LITTERFALL IN TWO NOTHOFAGUS FORESTS IN SOUTHERN CHILE
title_sort	nitrogen fluxes in throughfall and litterfall in two nothofagus forests in southern chile
publisher	Facultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción
publishDate	2005
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432005000200002
work_keys_str_mv	AT staelensjeroen nitrogenfluxesinthroughfallandlitterfallintwonothofagusforestsinsouthernchile AT godoyroberto nitrogenfluxesinthroughfallandlitterfallintwonothofagusforestsinsouthernchile AT oyarzuncarlos nitrogenfluxesinthroughfallandlitterfallintwonothofagusforestsinsouthernchile AT thibokaren nitrogenfluxesinthroughfallandlitterfallintwonothofagusforestsinsouthernchile AT verheyenkris nitrogenfluxesinthroughfallandlitterfallintwonothofagusforestsinsouthernchile
_version_	1718442221633536000

NITROGEN FLUXES IN THROUGHFALL AND LITTERFALL IN TWO NOTHOFAGUS FORESTS IN SOUTHERN CHILE

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