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Hydrological controls on nutrient exportation from old-growth evergreen rainforests and Eucalyptus nitens plantation in headwater catchments at Southern Chile

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Abstract
Soil cover disturbances have a direct effect on biogeochemistry, potentially enhancing nutrient loss, land degradation and associated changes in ecosystem services and livelihood support. The objective of this study was to assess how canopy affected throughfall chemistry and how hydrology affected stream nutrient load responses in two watersheds dominated by native old-growth evergreen rainforest (NF) and exotic plantation of Eucalyptus nitens (EP), located at the Coastal mountain range of southern Chile (40˚S). We measured nitrogen (NO3-N, NH4-N, Organic-N, Total-N) and total phosphorus (Total-P) at catchment discharge, and δ18O in throughfall precipitation and stream discharge in both catchments, in order to separate throughfall (or new water) contributions during storm events. It was hypothesized that all nutrients showed an increase in concentration as discharge increased (or enhanced hydrological access), in EP; but not in NF. Our results indicated that Organic-N, Total-N and Total-P concentrations were positively related to discharge. However, 3 NO− -N showed a negative correlation with catchment discharge.
Keywords
Hydrological Controls, Headwater Catchments, Nutrient Fluxes, Native Rainforests, Exotic Plantations

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Chicago
Oyarzun, Carlos E, Pedro Alejandro Hervé Fernández, Dries Huygens, Pascal Boeckx, and Niko Verhoest. 2015. “Hydrological Controls on Nutrient Exportation from Old-growth Evergreen Rainforests and Eucalyptus Nitens Plantation in Headwater Catchments at Southern Chile.” Open Journal of Modern Hydrology 5: 19–31.
APA
Oyarzun, C. E., Hervé Fernández, P. A., Huygens, D., Boeckx, P., & Verhoest, N. (2015). Hydrological controls on nutrient exportation from old-growth evergreen rainforests and Eucalyptus nitens plantation in headwater catchments at Southern Chile. OPEN JOURNAL OF MODERN HYDROLOGY, 5, 19–31.
Vancouver
1.
Oyarzun CE, Hervé Fernández PA, Huygens D, Boeckx P, Verhoest N. Hydrological controls on nutrient exportation from old-growth evergreen rainforests and Eucalyptus nitens plantation in headwater catchments at Southern Chile. OPEN JOURNAL OF MODERN HYDROLOGY. 2015;5:19–31.
MLA
Oyarzun, Carlos E, Pedro Alejandro Hervé Fernández, Dries Huygens, et al. “Hydrological Controls on Nutrient Exportation from Old-growth Evergreen Rainforests and Eucalyptus Nitens Plantation in Headwater Catchments at Southern Chile.” OPEN JOURNAL OF MODERN HYDROLOGY 5 (2015): 19–31. Print.
@article{6994381,
  abstract     = {Soil cover disturbances have a direct effect on biogeochemistry, potentially enhancing nutrient loss, land degradation and associated changes in ecosystem services and livelihood support. The objective of this study was to assess how canopy affected throughfall chemistry and how hydrology affected stream nutrient load responses in two watersheds dominated by native old-growth evergreen rainforest (NF) and exotic plantation of Eucalyptus nitens (EP), located at the Coastal mountain range of southern Chile (40\unmatched{02da}S). We measured nitrogen (NO3-N, NH4-N, Organic-N, Total-N) and total phosphorus (Total-P) at catchment discharge, and \ensuremath{\delta}18O in throughfall precipitation and stream discharge in both catchments, in order to separate throughfall (or new water) contributions during storm events. It was hypothesized that all nutrients showed an increase in concentration as discharge increased (or enhanced hydrological access), in EP; but not in NF. Our results indicated that Organic-N, Total-N and Total-P concentrations were positively related to discharge. However, 3 NO\ensuremath{-} -N showed a negative correlation with catchment discharge.},
  author       = {Oyarzun, Carlos E and Herv{\'e} Fern{\'a}ndez, Pedro Alejandro and Huygens, Dries and Boeckx, Pascal and Verhoest, Niko},
  issn         = {2163-0461},
  journal      = {OPEN JOURNAL OF MODERN HYDROLOGY},
  keyword      = {Hydrological Controls,Headwater Catchments,Nutrient Fluxes,Native Rainforests,Exotic Plantations},
  language     = {eng},
  pages        = {19--31},
  title        = {Hydrological controls on nutrient exportation from old-growth evergreen rainforests and Eucalyptus nitens plantation in headwater catchments at Southern Chile},
  url          = {http://dx.doi.org/10.4236/ojmh.2015.52003},
  volume       = {5},
  year         = {2015},
}

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