Abstract
In six small catchments located at the Cordillera de la Costa in southern Chile (40° S), concentrations and fluxes of NO3-N, NH4-N, organic-N, total-N and total-P in bulk precipitation and runoff water were measured. The main objective of this study was to compare nitrogen and phosphorus retention of catchments with varying land cover of native forest and exotic plantations, in order to evaluate possible effects of land use change. Nitrate-N was the dominant fraction (>50%) of nitrogen loss, especially in the catchments dominated by exotic plantations. In the catchment with native forests, NO3 − only contributed with 34% of the nitrogen loss and DON was the main output with 55%. Annual NO3 − export was lower in the catchment with native forest compared to the catchments with exotic plantations where the streamflow output exceed the precipitation input. Average inputs of total-N were 2.6 kg ha−1 year−1 (DIN = 1.4 kg ha−1 year−1, DON = 1.2 kg ha−1 year−1) and outputs were 1.7 kg ha−1 year−1 (DIN = 1.2 kg ha−1 year−1, DON = 0.5 kg ha−1 year−1). Annual retention of total nitrogen fluctuated between 61% in a catchment dominated by native forests to 15% in catchments dominated by exotic plantations of Eucalyptus sp. Nitrogen retention was positively related with native forest coverage. The N retention capacity of the catchments could be both attributed to consequences of clear cutting practices and differences in vegetation cover.
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Oyarzun, C., Aracena, C., Rutherford, P. et al. Effects of Land Use Conversion from Native Forests to Exotic Plantations on Nitrogen and Phosphorus Retention in Catchments of Southern Chile. Water Air Soil Pollut 179, 341–350 (2007). https://doi.org/10.1007/s11270-006-9237-4
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DOI: https://doi.org/10.1007/s11270-006-9237-4