Resposta da capacidade de sorção de fósforo do solo a ocupação urbana em ecossistemas tropicais
Phosphorus (P) is naturally present in soils. Changes in land use can promote additional inputs of P into the soil that lead to saturation of binding sites exceeding the maximum sorption capacity of P in the soil. Besides P input, urban occupation promotes changes in soil attributes that contribute...
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| Formato: | Dissertação |
| Idioma: | pt_BR |
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Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/handle/123456789/45603 |
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| Resumo: | Phosphorus (P) is naturally present in soils. Changes in land use can promote additional
inputs of P into the soil that lead to saturation of binding sites exceeding the maximum
sorption capacity of P in the soil. Besides P input, urban occupation promotes changes in
soil attributes that contribute to intensify soil vulnerability to erosion and P flux from soil
to aquatic ecosystems, aggravating the water crisis, especially in the semiarid region. The
objective of this study was to evaluate the sorption characteristics of P in urban soils and
to verify their relationship with soil attributes. A total of fifty soil samples, twenty-five
of natural and twenty-five of urban soils were selected from different watersheds in the
state. The soil samples were characterized physically and chemically. The P sorption
characteristics were obtained by fitting the Langmuir and Freundlich equations.
Descriptive statistics, Pearson correlation and Principal Component Analysis (PCA) were
used to analyze these data. Urban soils showed lower P sorption capacity. The increase
of P-rem, pH, available P and reduction of clay contents occurred concomitantly with the
increase of phosphorus saturation index and the reduction of soil P sorption capacity in
urban soils, being good indicators of P source soils in watersheds. Lower Smáx, clay
content and Freundlich constant 1/n best distinguished natural from urban soils regarding
P sorption. The results show the reduction of P sorption capacity in soils, increasing its
mobility in watersheds and the risks related to P loads in aquatic ecosystems with urban
expansion worldwide. These data serve as a basis for decision making regarding the
appropriate management of soils in urban expansion areas in watersheds in order to
control the flux of P to aquatic systems. |
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