Liming and the phosphatase activity and mineralization of phosphorus in an andic soil

Trasar-Cepeda, Carmen; Carballas, T.; Gil‐Sotres, F.; Blas, E. de

doi:10.1016/0038-0717(91)90054-n

Cited by 44 publications

(16 citation statements)

References 22 publications

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“…A hidrólise de alguns compostos orgânicos fosfatados, como β-glicerolfosfato, fenilfosfato, β-naftilfosfato, p-nitrofenilfosfato e myo-inositolfosfato, e a atividade de enzimas que catalisam essa reação já foram detectadas em solos (Tabatabai, 1982;Trasar-Cepeda et al, 1991;Findenegg & Nelemans, 1993). Tal hidrólise acarreta a liberação de fosfato inorgânico solúvel que pode ser prontamente absorvido pelas plantas (Findenegg & Nelemans, 1993).…”

Section: Introductionunclassified

Efeito da saturação por bases sobre a atividade de fosfatases em um solo de tabuleiro costeiro cultivado com citros. I. Correlações entre a atividade enzimática e as diferentes características do solo alteradas pela calagem

Fernandes

Anjos

Sobral

et al. 1998

Rev. Bras. Ciênc. Solo

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RESUMONeste trabalho, utilizaram-se amostras de um Podzol cultivado com citros, na Estação Experimental de Umbaúba, Umbaúba-SE (Centro de Pesquisa Agropecuária dos Tabuleiros Costeiros-EMBRAPA), para avaliar a atividade de fosfatases ácidas e alcalinas em solo de tabuleiro costeiro submetido a diferentes porcentagens de saturação por base (32, 45, 68 e 76,6%), bem como as relações entre essas atividades e algumas características do solo. Respostas positivas ao incremento da saturação por bases foram observadas para pH, teor de matéria orgânica, fósforo disponível e atividade de fosfatases ácidas e alcalinas, em seus respectivos valores de pH ótimo de 6,5 e 11,0, ao passo que a biomassa microbiana não foi alterada significativamente por esse fator. Observou-se que a atividade da fosfatase ácida apresentou correlação significativa e positiva com a matéria orgânica e teores de cálcio e de magnésio trocáveis. A resposta das fosfatases alcalinas à saturação foi influenciada pelo pH, pela matéria orgânica, pelos teores de cálcio e de magnésio e pela biomassa microbiana do solo. Nenhuma das duas enzimas apresentou correlação com os teores de fósforo encontrados no solo analisado. No entanto, observou-se inibição da atividade das enzimas, quando a análise foi realizada em uma solução de reação com concentração de 124 µ µ µ µ µg mL -1 de P.Termos de indexação: fosfomonoesterase, enzimas do solo, mineralização, fósforo orgânico, tabuleiro costeiro, matéria orgânica.

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Section: Introductionunclassified

Efeito da saturação por bases sobre a atividade de fosfatases em um solo de tabuleiro costeiro cultivado com citros. I. Correlações entre a atividade enzimática e as diferentes características do solo alteradas pela calagem

Fernandes

Anjos

Sobral

et al. 1998

Rev. Bras. Ciênc. Solo

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“…Therefore, tt is suggested that hmmg at pH lower than 6.5 does not significantly alter microbial nitrification and denltrlfiCatlon capacities of this sod. Likewise, neither does tt effect P mlnerahzatlon [33]. On the other hand, hmlng to pH 6.0 and above had a beneficial effect on bacterial numbers while increasing the pH of this acid soil had a detrimental effect on fungal blomass…”

Section: Discussionmentioning

confidence: 87%

Microbiological response to Ca(OH)₂treatments in a forest soil

Nodar

Acea

Carballas

1992

FEMS Microbiology Letters

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Lime was added to a forest acid soil rich in organic matter. During five weeks of initial incubation at room temperature (until the various limed soil samples reached stabilized pHs of 5.5, 6.0 or 6.5), there were rapid increases in the bacterial population, denitrifiers, and fungal mycelia, particularly in the heaviest limed sample. Conversely, nitrite oxidizers decreased to undetectable numbers regardless of the lime dose applied. At this time soil samples were amended with 5% of fresh soil. During 12 weeks of subsequent incubation at 28°C, the bacterial population was favoured by increasing soil pH; nevertheless, at the end of the incubation the positive effect was only significant at pH 6.0 and 6.5. By contrast fungi were depressed by raising the pH. Nitrifiers and denitrifiers were more numerous in the limed than in the unlimed soils but only in samples at pH 6.5 were the differences significant throughout the incubation period.

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“…In other studies, phosphatase activity did not correlate well with net P mineralization rates (e.g. Dissing Nielsen and Eiland, 1980;Trasar-Cepeda and Carballas, 1991). This lack of correlation could result from poor estimates of net P mineralization rates, and/or interference from soil fauna such as earthworms which release phosphatase to soils.…”

Section: Relations Between Phosphatase Activity and P Mineralizationmentioning

confidence: 88%

A new method for estimating gross phosphorus mineralization and immobilization rates in soils

1992

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Phosphorus availability in soils is controlled by both the sizes of P pools and the transformation rates among these pools. Rates of gross P mineralization and immobilization are poorly known due to the limitations of available analytical techniques. We developed a new method to estimate P transformation rates in three forest soils and one grassland soil representing an Alfisol, an Ultisol, and Andisol, and a Mollisol. Three treatments were applied to each soil in order to separate the processes of mineral P solubilization, organic P mineralization, and solution P immobilization. One set of soils was retained as control, a second set was irradiated with F-rays to stop microbial immobilization, and a third was irradiated and then autoclaved, also stop phosphatase activity. All three sets of samples were then incubated with anion exchange resin bags under aerobic conditions. Differences in resin P among the three treatments were used to estimate gross P mineralization and immobilization rates. Autoclaving did not affect resin-extractable P in any of the soils. Radiation did not alter resin-extractable P in the forest soils but increased resin-extractable P in the grassland soil. This increase was corrected in the calculation of potential P transformation rates. Effects of radiation on phosphatase activity varied with soils but was within 30% of the original values. Rates of P gross mineralization and immobilization ranged from 0.6-3.8 and 0-4.3 mgkg-soil -I d -l, respectively, for the four soils. The net rates of solubilization of mineral P in the grassland soil were 7-10 times higher than the rates in forest soils. Mineralization of organic P contributed from 20-60% of total available P in the acid forest soils compared with 6% in the grassland soil, suggesting that the P mineralization processes are more important in controlling P availability in these forest ecosystems. This new method does not require an assumption of equilibrium among P pools, and is safer and simpler in operation than isotopic techniques.

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Liming and the phosphatase activity and mineralization of phosphorus in an andic soil

Cited by 44 publications

References 22 publications

Efeito da saturação por bases sobre a atividade de fosfatases em um solo de tabuleiro costeiro cultivado com citros. I. Correlações entre a atividade enzimática e as diferentes características do solo alteradas pela calagem

Efeito da saturação por bases sobre a atividade de fosfatases em um solo de tabuleiro costeiro cultivado com citros. I. Correlações entre a atividade enzimática e as diferentes características do solo alteradas pela calagem

Microbiological response to Ca(OH)₂treatments in a forest soil

A new method for estimating gross phosphorus mineralization and immobilization rates in soils

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Liming and the phosphatase activity and mineralization of phosphorus in an andic soil

Cited by 44 publications

References 22 publications

Efeito da saturação por bases sobre a atividade de fosfatases em um solo de tabuleiro costeiro cultivado com citros. I. Correlações entre a atividade enzimática e as diferentes características do solo alteradas pela calagem

Efeito da saturação por bases sobre a atividade de fosfatases em um solo de tabuleiro costeiro cultivado com citros. I. Correlações entre a atividade enzimática e as diferentes características do solo alteradas pela calagem

Microbiological response to Ca(OH)2treatments in a forest soil

A new method for estimating gross phosphorus mineralization and immobilization rates in soils

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Microbiological response to Ca(OH)₂treatments in a forest soil