2007
DOI: 10.1590/s1415-43662007000300011
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Abstract: RESUMODevido aos grandes problemas de eutrofização de lagos e reservatórios, a identificação de áreas fornecedoras de fósforo possui grande importância no planejamento de medidas de controle da poluição hídrica por atividades agrícolas. Neste trabalho, aplicou-se uma metodologia denominada P-Index, para identificar áreas com potencial de fornecimento de fósforo de ecossistemas terrestres para os corpos d'água, cujo método está baseado no cruzamento de planos de informações referentes à disponibilidade de fósfo… Show more

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Cited by 14 publications
(11 citation statements)
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“…The other variables were more correlated with each other and with CP 2 , which demonstrates that the importance of the surface runoff on P index is higher in near stream areas, where the values of contributing distance and soil test P were also high. Also, these results showed that in addition to the three factors (soil loss, distance to streams and soil test P) used by Lopes et al (2007) in the calculation of P index, the additional variables used in this study are relevant in the Posses catchment.…”
Section: P Index For Current Land Usementioning
confidence: 70%
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“…The other variables were more correlated with each other and with CP 2 , which demonstrates that the importance of the surface runoff on P index is higher in near stream areas, where the values of contributing distance and soil test P were also high. Also, these results showed that in addition to the three factors (soil loss, distance to streams and soil test P) used by Lopes et al (2007) in the calculation of P index, the additional variables used in this study are relevant in the Posses catchment.…”
Section: P Index For Current Land Usementioning
confidence: 70%
“…These results may also reflect both the excessive soil tillage that is carried out downslope and the absence of soil conservation practices by landowners, as observed by Lopes et al (2007). Thus, better management practices can be focused on these fields.…”
Section: P Index For Current Land Usementioning
confidence: 96%
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“…Whereas P-thresholds consider only P levels in the soil, the P-index system, developed by Lemunyon and Gilbert (1993), considers data on soil type, soil P content, soil losses, and fertilizer use to estimate the risk of P transfer from a land area to surrounding water bodies. Few studies involving the use of a P-index have been published in Brazil (Lopes et al, 2007;Oliveira et al, 2010), making its calibration difficult. Nevertheless, as in any new method, immediate adoption is difficult because the system is composed of many variables that should be evaluated and tested in the field (SERA17, 2013), and there is still no organized collection of such data in Brazil.…”
Section: Introductionmentioning
confidence: 99%
“…Em trabalho recente desenvolvido no Brasil, Lopes et al (2007) utilizaram o IP conduzido por Lemunyon & Gilbert (1993) com o objetivo de identificar áreas de risco de contaminação de fósforo em bacia hidrográfica porém não existem trabalhos, no País, comparando os índices de P obtidos através da metodologia IP com os dados analiticamente determinados de P no escoamento superficial. Desta forma se propôs, com o presente estudo: 1) estimar o IP obtido de dados contidos em publicações científicas brasileiras, por meio de quatro versões; 2) comparar os dados de IP estimado com os de concentração e perda de P determinados analiticamente e 3) avaliar a influência de diferentes fatores na concentração e perda de P total, solúvel e particulado do escoamento superficial através de dados de publicações científicas brasileiras.…”
Section: Introductionunclassified