Formas de fósforo no solo sob leguminosas florestais, floresta secundária e pastagem no Norte Fluminense

Zaia, Francisco Costa; Gama-Rodrigues, Antônio Carlos; Gama-Rodrigues, Emanuela Forestieri

doi:10.1590/s0100-06832008000300027

Cited by 17 publications

(7 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This proportion of Po is within the range found in tropical regions for several soil orders (from low to medium content of organic C) and land-use systems, with average values of total Po from 26% [9,35,36] to 31% [11,19,37]. Oliveira et al [38] found proportions of total Po ranging from 36% to 46% for soils with high contents of organic matter, a conclusion that supports these findings.…”

Section: Distribution Of Organic and Inorganic P Fractionssupporting

confidence: 71%

“…Po is formed by phosphate ions, which are bonded to C moieties and its lability is directly related to the decomposition susceptibility of the organic moiety to which the phosphate is bonded [8]. In natural systems or in soils with little or no P addition, the element availability is directly related to the organic forms cycling [9][10][11]. Thus the soil can be a source of P, while providing stocks of available P to plants or a P sink when part of the added fertilizer is fixed.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Labile and Non-Labile Fractions of Phosphorus and Its Transformations in Soil under Eucalyptus Plantations, Brazil

Costa

Gama-Rodrigues

Gonçalves

et al. 2016

Forests

View full text Add to dashboard Cite

Phosphorus (P) is the main limiting nutritional factor in the cultivation of Eucalyptus in Brazil. Despite this, little is known about the P fractions and dynamics in Eucalyptus soils in tropical regions. The aims of this study were (1) to evaluate the distribution of labile and non-labile fractions of P in soil in 10 sites of Eucalyptus in the state of São Paulo, Brazil and (2) to determine the interactions among the P fractions and to identify which fractions act as sinks or sources for the available P fraction. The P fractions were separated using the Hedley sequential extraction method, and the P transformation processes were evaluated via structural equation modeling. The labile P (resin-Pi + Pi and Po in NaHCO 3 ) varied between 6% and 16%, the moderately labile P (Pi + Po in NaOH) varied between 28% and 40%, the occluded P (Pi + Po in Sonicate + NaOH) varied between 6% and 19%, the P associated with Ca (HCl-Pi) varied between 0.4% and 3% and the residual-P varied between 35% and 47%. The hypothetical structural model of soil P cycle was composed of four P pools (latent variables): the organic pool, occluded pool, inorganic pool, and available pool. The structural model was adequate to identify functional pools of P in soil, and to identify transformation processes of P based on the source-sink relationships. The available P pool was highly dependent on inorganic and occluded pools and the organic pool acted predominantly as a sink of P on available and inorganic pools. The results reinforce the high level of recalcitrance of the organic pool and the fact that Eucalyptus plants must access pools of limited-availability P to meet their nutritional demands.

show abstract

Section: Distribution Of Organic and Inorganic P Fractionssupporting

confidence: 71%

Section: Introductionmentioning

confidence: 99%

Labile and Non-Labile Fractions of Phosphorus and Its Transformations in Soil under Eucalyptus Plantations, Brazil

Costa

Gama-Rodrigues

Gonçalves

et al. 2016

Forests

View full text Add to dashboard Cite

show abstract

“…The introduction of leguminous forest species has been shown to have positive effects on some soil quality parameters in reforestation projects in degraded areas (Franco et al, 1992;Macedo et al, 2008). In previous studies at the same site, introduced leguminous forest species obtained promising results in terms of soil fertility improvement by contributing to the stability of soil microbial biomass and activity (Zaia et al, 2008) and by increasing C and N reserves available for mineralization (Nunes, 2008). In addition, the leguminous species appeared to increase the number of individuals in different functional guilds in the litter-soil system (Manhães, 2008).…”

Section: Introductionmentioning

confidence: 99%

Influence of mineral fertilization on edaphic fauna in Acacia auriculiformis (A. Cunn) plantations

Ribeiro¹,

Gama-Rodrigues²,

Moço³

et al. 2014

Rev. Bras. Ciênc. Solo

View full text Add to dashboard Cite

SUMMARYFertilization and/or the accumulation of organic matter from plant residues can influence the composition of soil and litter community. The goal of this study was to evaluate the effects of P and K fertilization on total faunal and nematode faunal composition and richness in plant litter and soil for 360 days in an area reforested with Acacia auriculiformis (A. Cunn), located in the municipality of Conceição de Macabu in the State of Rio de Janeiro. For each treatment (fertilized and unfertilized plots), samples of litter and soil (to a depth of 5 cm) were collected and transferred into a Berlese-Tüllgren funnels for the extraction of fauna. Mesofauna and macrofauna were quantified, and the major taxa identified. Nematodes were extracted by centrifugal flotation in sucrose solution and identified according to feeding habits. Density (number of individuals m -2 ) of total fauna, microphages, social insects and saprophages varied significantly per treatment and sampling time in both litter and soil. The total number of individuals collected was 5,127, and the total number of nematodes 894. Phosphorus and potassium fertilization resulted in an increase in total fauna density and richness in the litter due to an increased abundance of social insects, saprophages and herbivores. In the soil, fertilization increased the saprophage and predator densities. Saprophages were the predominant taxa in the litter, while social insects (Formicidae) prevailed in the soil. Litter nematode populations were favored by mineral fertilization. Bacteriophages were the predominant nematode group in both litter and soil.Index terms: soil invertebrates, nematode, forest plantations, litter.( A adubação ou o acúmulo de matéria orgânica via resíduos vegetais pode influenciar a composição da comunidade da fauna do solo e da serapilheira. O objetivo deste trabalho foi avaliar os efeitos da adubação mineral com P e K sobre a composição e a riqueza da fauna e da nematofauna da serapilheira e do solo em uma área reflorestada com Acacia auriculiformis (A. Cunn), em um período de 360 dias, no município de Conceição de Macabu, RJ. Em cada tratamento (parcela adubada e não adubada), coletaram-se amostras de serapilheira e de solo (até a profundidade de 5 cm), que foram transferidas para funis de Berlese-Tüllgren para a extração da fauna. Meso e macrofauna foram quantificadas e identificadas em nível de grandes grupos taxonômicos. Os nematoides foram extraídos pelo método de flutuação centrífuga em solução de sacarose e identificados de acordo com seus hábitos alimentares. A densidade (número de indivíduos m -2 ) da fauna total e a de micrófagos, insetos sociais e saprófagos variaram significativamente entre tratamentos e época de coleta, na serapilheira e no solo. O total de indivíduos da fauna foi de 5.127 e de nematoides, 894. Na serapilheira, a adubação com P e K contribuiu para o aumento da densidade e riqueza da fauna total, especificamente de insetos sociais, saprófagos e herbívoros. Já no solo, a adubação promoveu o aumento da densida...

show abstract

“…In general, under tropical soils, there is predominance of Pi forms than Po [45][46][47]. Organic P shows great importance because its majority part is labile and moderate labile P fraction, which acts in supply soil solution with Pi when its concentration decreases through plant uptakes and microorganism immobilization [45,48].…”

Section: Phosphorus Forms In Soilmentioning

confidence: 99%

Phosphorus in Forage Production

Serra¹,

Marchetti²,

Dupas³

et al. 2018

New Perspectives in Forage Crops

View full text Add to dashboard Cite

The aim in developing this work was to summarize information about phosphorus (P) limitation and dynamic in tropical soils for forage grasses production. The major idea is direct information about limited factors affecting P availability, dynamic of P fractionation, P pools, P forms, P use efficiency, and the 4R's Nutrient Stewardship' for P-fertilizer in forage grasses. Organizing these sub-headings in a chapter can result in interesting of how P behaves under tropical soils, in order to take decision to manage P-fertilizer to accomplish forage grasses production with social, economic, and environmental benefits. As the most limiting nutrient in tropical soils, P-fertilizer in forage grasses can be more effective if the best management practices are followed. In order to avoid excess P-fertilizer application in soil or P-fertilizer response with low efficiency, it is important to understand the P dynamic and the factors associated with P adsorption in soil. Even with low amount of P requested to forages species, the P available in soil is quite low, and this knowledge is primordial to direct P-fertilizer. Tropical soils are quite limited in P content, due to the natural formation with parental material poor in P content and highly weathering condition. Thus, in order to improve phosphorus use efficiency, the 4R's must be followed to improve P use efficiency (PUE). It is not easy to improve PUE in highly weathering soil with high buffering capacity; however, all the combination of best management practices for P-fertilizer application can result in better use efficiency. Based on the scarcity of natural P-sources in the whole world, the use of alternative P-sources should be incentivized, and more researches about this issue are need for better understanding.

show abstract

Formas de fósforo no solo sob leguminosas florestais, floresta secundária e pastagem no Norte Fluminense

Cited by 17 publications

References 19 publications

Labile and Non-Labile Fractions of Phosphorus and Its Transformations in Soil under Eucalyptus Plantations, Brazil

Labile and Non-Labile Fractions of Phosphorus and Its Transformations in Soil under Eucalyptus Plantations, Brazil

Influence of mineral fertilization on edaphic fauna in Acacia auriculiformis (A. Cunn) plantations

Phosphorus in Forage Production

Contact Info

Product

Resources

About