Nitrogen management challenges in major watersheds of South America. Bustamante, M., M., C., Martinelli, L., A., Pérez, T., Rasse, R., Ometto, J., Siqueira Pacheco, F., Machado Lins, S., R., & Marquina, S. Environmental Research Letters, 10(6):065007, 6, 2015. ![Nitrogen management challenges in major watersheds of South America [link]](https://bibbase.org/img/filetypes/link.svg "link")
Website abstract bibtex Urbanization and land use changes alter the nitrogen (N) cycle, with critical consequences for
continental freshwater resources, coastal zones, and human health. Sewage and poor watershed
management lead to impoverishment of inland water resources and degradation of coastal zones.
Here we review the N contents of rivers of the three most important watersheds in South America: the
Amazon, La Plata, and Orinoco basins. To evaluate potential impacts on coastal zones, we also present
data on small- and medium-sized Venezuelan watersheds that drain into the Caribbean Sea and are
impacted by anthropogenic activities. Median concentrations of total dissolved nitrogen (TDN) were
325 μg L−1 and 275 μg L−1 in the Amazon and Orinoco basins, respectively, increasing to nearly
850 μg L−1 in La Plata Basin rivers and 2000 μg L−1 in small northern Venezuelan watersheds. The
median TDN yield of Amazon Basin rivers (approximately 4 kg ha−1 yr−1
) was larger than TDN yields
of undisturbed rivers of the La Plata and Orinoco basins; however, TDN yields of polluted rivers were
much higher than those of the Amazon and Orinoco rivers. Organic matter loads from natural and
anthropogenic sources in rivers of South America strongly influence the N dynamics of this region.
@article{
title = {Nitrogen management challenges in major watersheds of South America},
type = {article},
year = {2015},
identifiers = {[object Object]},
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websites = {http://dx.doi.org/10.1088/1748-9326/10/6/065007,citeulike-article-id:14224379},
month = {6},
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abstract = {Urbanization and land use changes alter the nitrogen (N) cycle, with critical consequences for
continental freshwater resources, coastal zones, and human health. Sewage and poor watershed
management lead to impoverishment of inland water resources and degradation of coastal zones.
Here we review the N contents of rivers of the three most important watersheds in South America: the
Amazon, La Plata, and Orinoco basins. To evaluate potential impacts on coastal zones, we also present
data on small- and medium-sized Venezuelan watersheds that drain into the Caribbean Sea and are
impacted by anthropogenic activities. Median concentrations of total dissolved nitrogen (TDN) were
325 μg L−1 and 275 μg L−1 in the Amazon and Orinoco basins, respectively, increasing to nearly
850 μg L−1 in La Plata Basin rivers and 2000 μg L−1 in small northern Venezuelan watersheds. The
median TDN yield of Amazon Basin rivers (approximately 4 kg ha−1 yr−1
) was larger than TDN yields
of undisturbed rivers of the La Plata and Orinoco basins; however, TDN yields of polluted rivers were
much higher than those of the Amazon and Orinoco rivers. Organic matter loads from natural and
anthropogenic sources in rivers of South America strongly influence the N dynamics of this region.},
bibtype = {article},
author = {Bustamante, M M C and Martinelli, L A and Pérez, T and Rasse, R and Ometto, JPHB and Siqueira Pacheco, F and Machado Lins, S R and Marquina, S},
journal = {Environmental Research Letters},
number = {6}
}
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