caracterização química e granulométrica de solos do golfão maranhense chemical and granulometric caracterization of soils in the golfão maranhense
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2009
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Abstract
A área de estudo corresponde aos campos flúvio-marinhos com risco de inundação e presença de solos hidromórficos da região do Golfão Maranhense. Os solos dessa região apresentam algum impedimento a drenagem, proximidade com o mar (fonte de sais), condições favoráveis a inundação e aos processos de evaporação. Este conjunto de fatores pode elevar as concentrações de sais solúveis e inviabilizar ou reduzir a produtividade. Foram coletadas 38 amostras de solo em 22 pontos com trado holandês a profundidades variáveis, normalmente de 0 a 20 e de 30 a 50 cm. As amostras foram secas ao ar e analisados atributos químicos e granulométricos. Os solos do golfão maranhense apresentam grande variabilidade e predominam os com argila de atividade alta, alta soma de bases e altos teores de hidrogênio e alumínio. Os teores de magnésio são predominantes em relação aos de cálcio. Apesar da maioria dos solos apresentarem textura argilosa a granulometria é bastante variável. Mesmo com altos teores de magnésio e de sódio o grau de floculação das amostras pode ser considerado alto. Os solos do Golfão Maranhense não se encontram salinizados, porém é necessário manejá-los de maneira adequada para não promover sua salinização.
The study area of this study corresponds to fluviomarine fields with flood risk and the presence of hydromorphic soils in the Golfão Maranhense region. The soils of the area present slow drenage, proximity with the sea (salt source) and favorable conditions for flood, and evaporation processes. All these factors may increase the concentration of soluble salts and reduce productivity or make it inviable. We collected 38 soil samples in 22 points at variable depths, normally between 0 to 20 and 30 to 50 cm. The samples were air dried and their chemical and granulometric attributes analyzed. The soil of Golfão Maranhense presents high variability of chemical and granulometric attributes, and is predominant with high exchange capacity, high sum of bases, and high concentration of hydrogen and aluminum. The magnesium concentration predominates in relation to calcium. Even though the majority of soils present clay texture, granulometry is highly variable. Despite the high concentration of magnesium and sodium, the soil flocculation degree is considered high. The soils of Golfão Maranhense are not salinized, but an appropriate management is necessary so not to promote its salinization.
The study area of this study corresponds to fluviomarine fields with flood risk and the presence of hydromorphic soils in the Golfão Maranhense region. The soils of the area present slow drenage, proximity with the sea (salt source) and favorable conditions for flood, and evaporation processes. All these factors may increase the concentration of soluble salts and reduce productivity or make it inviable. We collected 38 soil samples in 22 points at variable depths, normally between 0 to 20 and 30 to 50 cm. The samples were air dried and their chemical and granulometric attributes analyzed. The soil of Golfão Maranhense presents high variability of chemical and granulometric attributes, and is predominant with high exchange capacity, high sum of bases, and high concentration of hydrogen and aluminum. The magnesium concentration predominates in relation to calcium. Even though the majority of soils present clay texture, granulometry is highly variable. Despite the high concentration of magnesium and sodium, the soil flocculation degree is considered high. The soils of Golfão Maranhense are not salinized, but an appropriate management is necessary so not to promote its salinization.
| Reference Key |
valladares2009actacaracterizao
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|---|---|
| Authors | ;Gustavo Souza Valladares |
| Journal | tumour biology : the journal of the international society for oncodevelopmental biology and medicine |
| Year | 2009 |
| DOI |
10.1590/S0044-59672009000400020
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| URL | |
| Keywords | Keywords not found |
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