@Article{BustamanteMPROPLM:2015:NiMaCh,
author = "Bustamante, Mercedes M. C. and Martinelli, Luiz Antonio and
P{\'e}rez, Tibisay and Rasse, Rafael and Ometto, Jean Pierre
Henry Balbaud and Pacheco, Felipe Siqueira and Lins, Silvia
Rafaela Machado and Marquina, Sorena",
affiliation = "{Universidade de Bras{\'{\i}}lia (UNB)} and {Universidade de
S{\~a}o Paulo (USP)} and {Instituto Venezolano de Investigaciones
Cient{\'{\i}}ficas (IVIC)} and {Instituto Venezolano de
Investigaciones Cient{\'{\i}}ficas (IVIC)} and {Instituto
Nacional de Pesquisas Espaciais (INPE)} and {Instituto Nacional de
Pesquisas Espaciais (INPE)} and {Universidade de S{\~a}o Paulo
(USP)} and {Instituto Venezolano de Investigaciones
Cient{\'{\i}}ficas (IVIC)}",
title = "Nitrogen management challenges in major watersheds of South
America",
journal = "Environmental Research Letters",
year = "2015",
volume = "10",
number = "6",
pages = "Article number 065007",
month = "June",
keywords = "agriculture, nutrient management, wastewater.",
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.",
doi = "10.1088/1748-9326/10/6/065007",
url = "http://dx.doi.org/10.1088/1748-9326/10/6/065007",
issn = "1748-9326",
language = "en",
targetfile = "Bustamante_nitrogen.pdf",
urlaccessdate = "27 abr. 2024"
}