Antonio Carlos Gama-Rodrigues

Universidade Estadual do Norte Fluminense · Laboratory of Soils – LSOL

Cacao-based agroforestry systems can sequester much soil carbon (C), but information on soil organic matter (SOM) chemical composition within aggregates still needs to be available. This study aimed to evaluate (1) the impact of forest or pasture conversion to cacao AFS by assessing the chemistry of the Cm fraction, considering this as the primary...

Purpose To test the interconnections between pedogenetic drivers featured by climate, parent material, weathering intensity, soil properties, and their influence on inorganic and organic P compounds (31P NMR) in temperate ecosystems, and validation of the theoretical concept of P pools. Methods Data from the literature on the chronosequences of te...

Structural equation modeling (SEM) with latent variables was used to estimate the interconnections between soil properties and the P cycle in tropical and temperate environments from four case studies. The models were composed of four pools (latent variables): (i) organic P (Diester-P and monoester-P as indicator variables); (ii) inorganic P (ortho...

Cacao agroforestry systems (AFSs) have high potential for carbon (C) accumulation in weathered soils, but the chemical characterization of C compounds remains poorly understood. This information is key to understanding soil organic matter (SOM) dynamics. Thus, the chemical composition of organic matter within density fractions was determined in dif...

Agroforestry systems (AFS) promote a continuous deposition of organic material in the soil via litter and roots. Litter has a diversity of organic compounds with different chemical complexities, and which act as raw materials in forming and maintaining soil organic carbon. The objective of this study was to characterize the chemical composition of...

The development and productivity of the Amazon Forest are limited by the availability of phosphorus (P) in P-impoverished soils. Applying structural equation modeling (SEM) to develop hypothetical models capable of integrating multiple P absorption strategies and its soil cycle enables holistic understanding of the functionality of tropical forest...

Soil aggregates play an important role in reducing soil organic carbon (SOC) and total soil nitrogen (TN) losses, as they function as a physical barrier to the decomposition of soil organic matter (SOM). The SOM protection mechanism can be enhanced by implementing cacao agroforestry systems (cacao-AFSs). The objective of this study was to evaluate...

Brazil is one of the main producers in the agricultural and forestry sector worldwide, with production systems based on high consumption of inputs that contribute to high levels of greenhouse gas (GHG) emissions. This paper presents an analysis of the scenario of national GHG emissions and carbon footprints in the major production systems of agricu...

The chemical fractionation of C by an increasing oxidation gradient, has shown to be a fast and promising methodology to detect changes in C lability. The objectives of the present study presents were: to evaluate the level of lability of soil organic C after conversion of degraded pasture into leguminous trees; evaluate the influence of soil depth...

CONTEXT Cacao-based agroforestry systems is an appropriate technology as it contributes to improving the standard of living of the population of an agricultural region based on land use without causing undesirable environmental changes. Brazil contributes approximately 5% of world cocoa production. The main cocoa producing states are Bahia and Espí...

Organic phosphorus (Po) plays an important role in tropical forest nutrition on strongly-weathered soils. However, of its role in Eucalyptus nutrition little is known. For this purpose, soil P forms were determined by NaOH-Na2EDTA extraction and ³¹P nuclear magnetic resonance spectroscopy (³¹P NMR) at 10 sites of Eucalyptus plantations in Brazil. T...

Reforestation with forest legumes associated with nitrogen-fixing bacteria and arbuscular mycorrhizal fungi has been shown to be a favorable technique for revegetating degraded soils. This study was conducted with soils under forest legume plantations, secondary forest and pasture. Soil protein related to glomalin (SPRG) production and the organic...

Mixed-forest plantations have high potential to be an alternative to conventional monoculture systems to address environmental, social, and economic issues. This forest system can be considered as an adequate technique of climate-smart forestry. In this context, we focus on the Brazilian experience of the potential of mixed-species plantations with...

Litter decomposition restores part of the elements absorbed by the plant back into the soil, acting as a regulator of the biogeochemical cycling of nutrients. This study aimed to evaluate the litter quantity and quality of Eucalyptus grandis in Northern Fluminense region, RJ. Three rotational sequences were studied, the first after 8 years (FR8), t...

The location of organic matter within the aggregate is a key factor for stabilizing and storing soil organic carbon (SOC). In this context, the purpose of this study was to answer the following question: How much is the contribution of aggregate associated-C in total SOC accumulation up to 1 m under different land uses in the Atlantic rainforest zo...

The early natural forest conversion to pasture, rubber tree plantations or agroforestry systems (AFSs) will not negatively affect soil organic carbon (SOC) accumulation due to the lack of soil tillage and the continuous contribution of vegetal residues to the soil, over the years, which would favor C occlusion in soil aggregates. The objectives of...

The quantification and transfer of nutrient stock among compartments in the forest environment is the key to understanding the nutrient cycling process. The aim of this study was to quantify the nutrient stock and dynamics by litter deposition in a Corymbia citriodora settlement in the Mountainous region of the State of Rio de Janeiro. Different pl...

To increase the limited knowledge about phosphorus (P) species in strongly weathered soils of agroforests in tropical regions, the soil organic P was determined in different cacao (Theobroma cacao L.) agroforestry systems from the Atlantic forest region of Brazil, varying in age and phosphate fertilizer application. For this purpose NaOH-EDTA extra...

This study evaluated if the effect of secondary forest (SF) conversion into pasture (PAS) or rubber tree plantation (RT) and cacao + erythrina AFS (C + E) conversion into cacao + rubber tree AFS (C + RT) on the C and N storage in soils and aggregate-size fractions could be compensated by a high amount of organic residues deposited over the years by...

O objetivo deste trabalho foi avaliar as inter-relações entre uso do solo, posição na paisagem (posição na topossequência) e seus efeitos sobre atributos físicos, químicos e microbiológicos em solos sob diferentes sistemas de uso da terra em duas topossequências no Noroeste do Estado do Rio de Janeiro. A primeira topossequência consistiu de vegetaç...

The use of 31P nuclear magnetic resonance spectroscopy in the soil showed that the leguminous trees inoculated with the diazotrophic bacteria and arbuscular mycorrhizal fungi can increase soil P concentrations by cycling and accumulation of organic and inorganic compounds of P. The planting of leguminous trees species for recovering degraded lands...

This poster intends to show the potential of different cacao AFS to stock SOC and the extent of the sequestered C that is occluded in the soil aggregates.

Background The dynamics of phosphorus (P) in the environment is important for regulating nutrient cycles in natural and managed ecosystems and an integral part in assessing biological resilience against environmental change. Organic P (Po) compounds play key roles in biological and ecosystems function in the terrestrial environment being critical t...

The article “Organic phosphorus in the terrestrial environment: a perspective on the state of the art and future priorities”, written by Timothy S George et al., was originally published with incorrect affiliation information for one of the co-authors, E. Klumpp.

This study examined the impact of land use changes on phosphorus (P) transformations in soils of different pedogenesis with little or no addition of P in the humid tropical region. The sequential extraction method was used to determine P fractions, and structural equations modeling was employed to investigate the P cycle in soils under plantations...

The aim of this study was to apply the method of structural equation modeling using latent variables (constructs) with multi-indicators to test hypothesized interaction models among functional groups of fauna and attributes of litter-soil system in cacao agroforests in the south of Bahia, Brazil. The hypothesized structural model was composed of fo...

The aim of this study was used a basic hypothetical structural model with latent variables to analyze the interconnections between the pools of stable P (inorganic P (Pi) and organic P (Po)), labile P (Pi and Po) and available P (Mehlich-1 P) and the pools of organic matter (OM) content and physicochemical properties in tropical soils of differing...

Little is known about the phosphorus (P) fractions and P lability of agroforest soils in tropical regions, particularly those of cacao (Theobroma cacao L.) agroforests. We hypothesized that the effect of P fertilization on the distribution of P fractions in the soil based on the source-sink relationship differs for different cacao agroforestry syst...

Finalist of the Scientific Dissemination Contest in the IV SIMPÓSIO MINEIRO DE CIÊNCIA DO SOLO (2017)

Our hypothesis was that the diversity of species and concentrations of P in Yellow Argissol (Ultisol) can be influenced by different types of cacao agroforestry systems (Theobroma cacao L.) with low input of phosphate fertilizer. The phosphorus forms were determined by solution 31P-NMR spectroscopy. Conclusions: The cacao agroforests exhibited the...

Reforestation has a great potential on soil carbon sequestration resulting from continuous deposition of plant residues above- and belowground. The purpose of this study was to answer the following questions: (1) did reforestation with 35 years old rubber tree plantation and 3 and 5 years old eucalyptus plantations enhance SOC accumulation up to 1...

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 sta...

Use of legume trees can improve soil quality in degraded pastures. The aim of this study was to characterize C and N mineralization kinetics and estimate the potentially mineralizable C and N in soil under Mimosa caesalpiniifolia Benth. and Acacia auriculiformis A. Cunn. ex Benth. secondary forest and pasture in red-yellow latosols in southeast Bra...

Respecification of structural models allows evaluating new hypothesis and enhances understanding of how changes in one pool can affect the other pools in the model. The aim of this study was to evaluate the theoretical concept of P pools (unmeasurable variables—latent) using data from Hedley’s sequential extraction method for a better understanding...

Soil organic matter plays an important role in the regulation of forest productivity. Knowledge of soil organic matter fractions in eucalyptus plantations allows for a better understanding of changes that may occur in the amount and quality of organic carbon along the crop cycle. The aim of this study was to evaluate organic C in different organic...

To compare the internal balances of nutrients and the rates of nutrient cycling across nine cocoa agroforestry systems consisting of various combination of soil types (Latosols and Cambisols), production systems (cabruca and Erythrina glauca-shade) and fertilization regimes in southern Bahia, Brazil. We measured nutrient stocks in litter fall produ...

In this study, we evaluate litter biomass and nutrient inputs, as well as nutrient use efficiency (NUE), in two fragments of dense montane rain forest within the Atlantic Forest Biome in the northern region of the state of Rio de Janeiro, Brazil. The total annual average litter production for the two fragments (designated M1 and M2) was 7.72 and 7....

Phosphorus availability in tropical soils may be regulated by the decomposition and mineralization of the labile organic phosphorus fraction (Po); therefore, studies assessing the actual contribution of Po to soil composition are necessary. The objective of this study was to evaluate the total and labile Po content in diagnostic surface horizons of...

In the tropics, highly weathered soils with high phosphorus (P) fixation capacities predominate, reducing the P availability to plants. For this reason, understanding the cycle of P in the soil is important to develop management strategies that increase P avail-ability to plants, especially in low-input production systems. The aim of this study was...

The aim of this study was to evaluate the production and accumulation of litter, nutrient content, structural components (cellulose and lignin) and secondary metabolites (polyphenols), in two leguminous trees plantations; Acacia auriculiformis and Mimosa caesalpiniifolia with a potential for recovery of degraded pastures. This study was conducted i...

Fertilization 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 auric...

Resumo A matéria orgânica do solo tem importante papel na regulação da sustentabilidade florestal. O conhecimen-to das frações da matéria orgânica do solo em plantações de eucalipto permite uma melhor compreensão das alterações que podem ocorrer na quantidade e qualidade do C orgânico ao longo do ciclo de cultivo. O objetivo deste trabalho foi aval...

Soil organisms comprise a large number of species that play a role in various ecosystem functions and provide valuable ecosystem services that sustain soil quality. The objective of this study was to characterize the meso- and macrofauna in soil and litter with different types of plant cover (Acacia auriculiformis A. Cunn. ex Benth., Mimosa caesalp...

In unfertilized, highly weathered tropical soils, phosphorus (P) availability to plants is dependent on the mineralization of organic P (Po) compounds. The objective of this study was to estimate the mineralization of total and labile Po in soil size fractions of > 2.0, 2.0-0.25 and < 0.25 mm under leguminous forest tree species, pasture and "capoe...

Resumo -Estudos sobre fertilização e nutrição florestal de espécies nativas e exóticas fornecem subsídios para programas de manejo para recuperação de áreas degradadas. O objetivo deste trabalho foi avaliar a produção de biomassa e a eficiência nutricional de plântulas das espécies arbóreas Swietenia macrophylla (mogno), Mimosa caesalpiniaefolia (s...

Large amounts of plant litter deposited in cacao agroforestry systems play a key role in nutrient cycling. Organic matter, nitrogen and phosphorus cycling and microbial biomass were investigated in cacao agroforestry systems on Latosols and Cambisols in Bahia, Brazil. The objective of this study was to characterize the microbial C and N, mineraliza...

O entendimento da participação de reservas orgânicas de N no suprimento de plantações de eucalipto é fundamental para o desenvolvimento de estratégias que maximizem a eficiência no uso de N por essa cultura. O objetivo deste trabalho foi avaliar a distribuição de reservas orgânicas de N em diferentes compartimentos no sistema solo-planta e a contri...

This study was conducted to link soil and litter microbial biomass and activity with soil and litter quality in the surface layer for different pure and mixed stands of native tree species in southeastern Bahia, Brazil. The purpose of the study was to see how strongly the differences among species and stands affect the microbiological attributes of...

Agroforestry systems (AFS) based on cacao (Theobroma cacao L.) may play an important role in capturing carbon (C) aboveground and storing it belowground (soil) through continuous deposition of plant residues. Cacao AFS in Bahia, Brazil, are comprised of cacao planted either with woody species such as Erythrina spp. and Gliricidia spp. or under tree...

This special issue includes a series of manuscripts presented at the second World Congress of Agroforestry held in Nairobi, Kenya, 23–28 August 2009. The studies were performed in various tropical and temperate regions. They cover a wide range of topics on nutrient cycling in different agroforestry types: soil organic matter fractions, biological N...

Agroforestry systems can play a major role in the sequestration of carbon (C) because of their higher input of organic material to the soil. The importance of organic carbon to the physical, chemical, and biological aspects of soil quality is well recognized. However, total organic carbon measurements might not be sensitive indicators of changes in...

Agroforestry systems (AFSs) have an important role in capturing above and below ground soil carbon and play a dominant role in mitigation of atmospheric CO(2). Attempts has been made here to identify soil organic matter fractions in the cacao-AFSs that have different susceptibility to microbial decomposition and further represent the basis of under...

This study was undertaken to investigate the relationship between soil and litter attributes to soil and litter fauna, and further to determine which of these attributes would be most significant in explaining the distribution of faunal communities in cacao agroforestry systems in the south of Bahia, Brazil. Soil and litter samples were collected i...

A estimativa da mineralização de N e de C é essencial no desenvolvimento de práticas que maximizem a eficiência no uso de N, especialmente no caso do eucalipto, que apresenta baixa magnitude de resposta à fertilização nitrogenada. Foram estimadas as taxas de mineralização de N e de C e avaliados os potenciais de mineralização de N e de C de solos s...

A estimativa da mineralização de N e de C é essencial no desenvolvimento de práticas que maximizem a eficiência no uso de N, especialmente no caso do eucalipto, que apresenta baixa magnitude de resposta à fertilização nitrogenada. Foram estimadas as taxas de mineralização de N e de C e avaliados os potenciais de mineralização de N e de C de solos s...

Shaded perennial agroforestry systems contain relatively high quantities of soil carbon (C) resulting from continuous deposition of plant residues; however, the extent to which the C is sequestered in soil will depend on the extent of physical protection of soil organic C (SOC). The main objective of this study was to characterize SOC storage in re...

Nutrient balance in tropical forest allows an evaluation of eventual differences due to management practices and conclusions on forest sustainability. The aim of this study was to evaluate the nutrient concentration in native species and quantify biomass production and C and nutrient balance in tropical montane Atlantic Forest fragments (Dense Mont...

Nutrient balance in tropical forest allows an evaluation of eventual differences due to management practices and conclusions on forest sustainability. The aim of this study was to evaluate the nutrient concentration in native species and quantify biomass production and C and nutrient balance in tropical montane Atlantic Forest fragments (Dense Mont...

Microbial populations are primarily responsible for the decomposition of organic residues, the nutrients cycle, and the flow of energy inside of soil. The present study was undertaken to link soil microbiological and soil biochemical parameters with soil- and litter-quality conditions in the surface layer from 5 sites differing in plant cover, in s...