NITROGEN EXPORT FROM FORESTED AND AGRICULTURAL WATERSHEDS OF SOUTHERN CHILE

Measuring nutrients fluxes in watersheds with different landuse is important for evaluating the effects of conversion of native forests to agricultural land, and for establishing guidelines for land management. Nitrogen (N) concentrations and fluxes were studied over a 12-month period in four waters...

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Autores principales: Oyarzún,Carlos E., Huber,Anton
Lenguaje:English
Publicado: Facultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción 2003
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Acceso en línea:http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432003000100010
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spelling oai:scielo:S0717-664320030001000102004-02-04NITROGEN EXPORT FROM FORESTED AND AGRICULTURAL WATERSHEDS OF SOUTHERN CHILEOyarzún,Carlos E.Huber,Anton Landuse native forest nitrogen fluxes non-point pollution Measuring nutrients fluxes in watersheds with different landuse is important for evaluating the effects of conversion of native forests to agricultural land, and for establishing guidelines for land management. Nitrogen (N) concentrations and fluxes were studied over a 12-month period in four watersheds in the Lake Rupanco basin in the Andean Cordillera and four watersheds located in the Lake Huillinco basin in the Coastal Cordillera of southern Chile. Two watersheds in either lake basins were covered mainly by native rainforests, and the other two had mixed landuse (livestock pastures, subsistence agriculture and shrub-pasture mixtures). In the Lake Rupanco area, the annual transport of NO3-N from forested and agricultural watersheds was 4.9 and 11.0 kg ha-1 yr-1, respectively. Inorganic-N (NO3-N + NH4-N) accounted for 53% and 74% of N transport in forested and agricultural watersheds, respectively. In the Lake Huillinco area, the annual transport of NO3-N was 1.4 and 0.8 kg ha-1 yr-1, respectively, with nitrogen organic forms (DON), prevailing and exported mainly from native forests. The impact of the replacement forests by livestock pasture was clearly reflected in the streamwater NO3-N concentrations and fluxes in the watersheds at the Lake Rupanco basin, probably due to fertilization practicesinfo:eu-repo/semantics/openAccessFacultad de Ciencias Naturales y Oceanográficas, Universidad de ConcepciónGayana. Botánica v.60 n.1 20032003-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432003000100010en10.4067/S0717-66432003000100010
institution Scielo Chile
collection Scielo Chile
language English
topic Landuse
native forest
nitrogen fluxes
non-point pollution
spellingShingle Landuse
native forest
nitrogen fluxes
non-point pollution
Oyarzún,Carlos E.
Huber,Anton
NITROGEN EXPORT FROM FORESTED AND AGRICULTURAL WATERSHEDS OF SOUTHERN CHILE
description Measuring nutrients fluxes in watersheds with different landuse is important for evaluating the effects of conversion of native forests to agricultural land, and for establishing guidelines for land management. Nitrogen (N) concentrations and fluxes were studied over a 12-month period in four watersheds in the Lake Rupanco basin in the Andean Cordillera and four watersheds located in the Lake Huillinco basin in the Coastal Cordillera of southern Chile. Two watersheds in either lake basins were covered mainly by native rainforests, and the other two had mixed landuse (livestock pastures, subsistence agriculture and shrub-pasture mixtures). In the Lake Rupanco area, the annual transport of NO3-N from forested and agricultural watersheds was 4.9 and 11.0 kg ha-1 yr-1, respectively. Inorganic-N (NO3-N + NH4-N) accounted for 53% and 74% of N transport in forested and agricultural watersheds, respectively. In the Lake Huillinco area, the annual transport of NO3-N was 1.4 and 0.8 kg ha-1 yr-1, respectively, with nitrogen organic forms (DON), prevailing and exported mainly from native forests. The impact of the replacement forests by livestock pasture was clearly reflected in the streamwater NO3-N concentrations and fluxes in the watersheds at the Lake Rupanco basin, probably due to fertilization practices
author Oyarzún,Carlos E.
Huber,Anton
author_facet Oyarzún,Carlos E.
Huber,Anton
author_sort Oyarzún,Carlos E.
title NITROGEN EXPORT FROM FORESTED AND AGRICULTURAL WATERSHEDS OF SOUTHERN CHILE
title_short NITROGEN EXPORT FROM FORESTED AND AGRICULTURAL WATERSHEDS OF SOUTHERN CHILE
title_full NITROGEN EXPORT FROM FORESTED AND AGRICULTURAL WATERSHEDS OF SOUTHERN CHILE
title_fullStr NITROGEN EXPORT FROM FORESTED AND AGRICULTURAL WATERSHEDS OF SOUTHERN CHILE
title_full_unstemmed NITROGEN EXPORT FROM FORESTED AND AGRICULTURAL WATERSHEDS OF SOUTHERN CHILE
title_sort nitrogen export from forested and agricultural watersheds of southern chile
publisher Facultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción
publishDate 2003
url http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432003000100010
work_keys_str_mv AT oyarzuncarlose nitrogenexportfromforestedandagriculturalwatershedsofsouthernchile
AT huberanton nitrogenexportfromforestedandagriculturalwatershedsofsouthernchile
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