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|Title:||FLUXOS DE N E P ORGÂNICOS E INORGÂNICOS E ÍONS MAJORITÁRIOS NO BAIXO CURSO DO RIO CAMPO BELO, ITATIAIA, RJ|
|Other Titles:||Fluxes of organic N and P and major ions in the lover course of Campo Belo river, Itatiaia, RJ|
|Keywords:||Hidrogeoquímica; Água doce; N orgânico; P orgânico; Rio Campo Belo; Bacia (Itatiaia, RJ); Organic N; Organic P; Hydrogeochemistry; Campo Belo river; Itatiaia, RJ|
|Abstract:||The Campo Belo river is located in the southern flank of the Itatiaia (RJ), drains an 90 km2 watershed, was sampled monthly from September 2003 to August 2004. The three sampling sites were established at the following heights: 510 m (site I), 410 m (site II) and 400 m (site III), Above 600 m height, the watershed is covered by native vegetation (tropical forest). Below 500 m, the watershed is quite influenced by human activities (pastures and urbanization). The water of the Campo Belo river has low conductivity (mean, 14,9 μS cm-1) and is slightly acidic (mean pH, 5,7). The total N content in river water was distributed as follows 12 % de NH4 +, 34 % NO3 -, 34 % PON e 17 % de DON. The total P content in river water was distributed as follows em 3 % de PO4 3-, 55 % de POP e 43 % de DOP. So, organic was the dominat form of N and mainly P in water. Weathering has a trivial influence on the river water. Significant amounts of Na, K, Ca and Mg has origin on the mineral nepheline, pyroxenes and amphiboles predominated in the region. The stream water export of parameters searched showing maximum values during rainfall, reflex weathering and runoff of material deposited on soil. Discharge presented a characteristic seasonal variation, showing a peak in December and January.|
|Appears in Collections:||TEDE sem arquivo|
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