-Agroecological management is considered a model of sustainable agriculture that off ers social, ... more -Agroecological management is considered a model of sustainable agriculture that off ers social, environmental and economic benefi ts. The hypotheses of this study were that agroecological production systems can promote changes in the physical fractions of soil organic matter (SOM) associated with aggregates of diff erent origins, and that the greater diversity of plant species in the production system may favour an increase in the carbon concentration of these aggregates. The aim of this study was to a) determine the mass of the free light fraction (FLF), intra-aggregate light fraction (ILF) and light organic matter fraction (LOM) of biogenic and physiogenic soil aggregates; and b) quantify the organic carbon content of the three light SOM fractions and the residual particulate SOM fraction. Five production systems were evaluated: AgF-Agroforestry system; CSun-Coff ee grown in full sun; CSha-Coff ee grown in shade; FLE-Flemingia grown in alleys; and NT-No-tillage. The aggregates were separated, identifi ed and classifi ed according to their origin or formation pathway into biogenic (formed by biological processes) or physiogenic aggregates (resulting from chemical and physical actions). From these, the mass and carbon content of the FLF, ILF, LOM and residual particulate fractions were quantifi ed. The greater diversity of plant species found in the AgF system has not yet favoured an increase in the carbon content of the aggregates. The longer setup time and the management practices of the CSun system has led to an increase in the carbon content of the organic fractions of the aggregates (3.44-1.63 g kg-1 for C-LOM; 1.93-1.13 g kg-1 for C-FLF). The lowest overall mean values for LOM and ILF were found mainly in the aggregates of the NT system (1.22-1.67 and 1.55-2.20 g kg-1 , respectively), being associated with the shorter time and greater mobilisation of the arable layer. Biogenic aggregation aff orded the highest overall mean values for LOM, and increased the mass of the light fractions (15.5%-27.8% for FLF; 23.4%-8.0% for ILF) and the carbon in the C-LOM, C-FLF and residual particulate fractions (42.3%, 12.9%, and 35.0%, respectively) in the surface layer, suggesting an improvement in soil quality.
The study of soil quality indicators can indicate the efficiency of forest restoration practices.... more The study of soil quality indicators can indicate the efficiency of forest restoration practices. Litter, soil chemical attributes, and soil fauna can be used for this purpose since these factors are linked to each other in nutrient cycling and respond to changes in land use management. The present study aimed to identify accumulated litter biomass on topsoil, its nutrient concentration, composition of the epigeal fauna community, and topsoil chemical attributes as possible soil quality indicators in restoration areas of Atlantic Forest (T1, T2, and T3) with different levels of native tree seedlings richness (29, 58, and 114 species, respectively), pasture (T4), and native forest (T5, control), by three plots (50 × 50 m) in each area, in the municipality of Linhares, Espírito Santo, Brazil. Samples of accumulated litter on topsoil, topsoil (0–5 cm), and community of epigeal fauna (by pitfall traps) were collected during the dry and rainy seasons. Accumulated litter biomass on the topsoil, concentration of K and Mg in its biomass, abundance of Coleoptera and Pseudoscorpionida, total N and exchangeable K concentrations in the topsoil were the most relevant soil quality indicators, according to the principal component analysis. In both climatic seasons, T5 presented high dissimilarity in relation to the other areas and best soil quality due to its association to higher values of accumulated litter biomass, its nutrient concentration (N, K, Ca, Mg, S), relative frequency or abundance of Coleoptera, Pseudoscorpionida, and Others, concentrations of total organic carbon, total N, available P, exchangeable Ca, extractable acidity, sum of bases, and cation exchange capacity; T1, T2, and T3 were associated to higher values of relative frequency of Formicidae and presented low dissimilarity to each other; T4 was associated to higher values of pH. Therefore, the forest restoration areas have not yet contributed to the general quality of the soil approaching that observed in T5.
Vast areas of the Brazilian Amazon have been deforested for the expansion of livestock and the ag... more Vast areas of the Brazilian Amazon have been deforested for the expansion of livestock and the agricultural frontier, which has resulted in soil exhaustion. It is therefore urgent to reduce deforestation and encourage sustainable land use to promote social and economic development in the region. The aim of this study was to evaluate the impact of different land use systems (an agroforestry system, cassava cultivation, non-degraded pasture, native forest) on the chemical properties of the soil (0-40 cm) in the mesoregion of the Juruá Valley, in the state of Acre, Brazil. Principal component analysis showed the soil in the forested area (reference) has greater values for P, Ca 2+ , Mg 2+ , K + , Na + , sum of bases, and cation exchange capacity; while hierarchical cluster analysis suggested little dissimilarity to the soil in the agroforestry system, and high dissimilarity to the soil in the areas of cassava cultivation and pasture. The results therefore support agroforestry as the most sustainable land use system, compared to cassava cultivation or pasture.
Several tropical woody species are highly responsive to arbuscular mycorrhizal fungi (AMF) and de... more Several tropical woody species are highly responsive to arbuscular mycorrhizal fungi (AMF) and depend on their symbiosis for nutrition and successful establishment in the field. The objective of this study was to evaluate the response of Schinus terebinthifolius, a native species of the Brazilian Atlantic Forest and Caatinga, to inoculation with three AMF species (Dentiscutata heterogama, Gigaspora margarita, and Rhizophagus clarus), either individually or mixed, at different levels of phosphorus fertilization (0, 71, 213, and 650 mg kg−1 of P). We conducted the experiment in 1 kg pots, following a completely randomized design with six replicates per treatment, to evaluate morphological and nutritional traits after 116 days, including stem diameter, plant height, plant biomass, and shoot P content. Our results showed that S. terebinthifolius was highly dependent on mycorrhizae and presented different responses depending on the AMF species. The greatest total biomass accumulation occ...
Forest plantations may minimize the effects of deforestation in the Amazon. However, there are di... more Forest plantations may minimize the effects of deforestation in the Amazon. However, there are differences among species in terms of their influences on soil recovery. The effects of monospecific plantations of Acacia mangium, Dipteryx odorata, Jacaranda copaia, Parkia decussata,and Swietenia macrophylla, and areas of pasture and native forest on the chemical soil attributes of the Brazilian Amazon were evaluated. One bulked soil sample was collected per plot (0.00-0.05, 0.05-0.10, and 0.10-0.30 m; three plots of 128 m2) in each area. No significant differences in most of the soil attributes were observed among the forest plantations. However, soil K+ and P were higher in the Swietenia macrophylla plantations, while higher values of Ca2+, sum of bases, and pH occurred in Jacaranda copaia plantations. In the native forest, the pH, and P content were lower, whereas the soil organic matter (SOM) content, soil organic carbon (SOC) content, cation exchange capacity (CEC), N content, H+Al...
The study of soil quality indicators can indicate the efficiency of forest restoration practices.... more The study of soil quality indicators can indicate the efficiency of forest restoration practices. Litter, soil chemical attributes, and soil fauna can be used for this purpose since these factors are linked to each other in nutrient cycling and respond to changes in land use management. The present study aimed to identify accumulated litter biomass on topsoil, its nutrient concentration, composition of the epigeal fauna community, and topsoil chemical attributes as possible soil quality indicators in restoration areas of Atlantic Forest (T1, T2, and T3) with different levels of native tree seedlings richness (29, 58, and 114 species, respectively), pasture (T4), and native forest (T5, control), by three plots (50 × 50 m) in each area, in the municipality of Linhares, Espírito Santo, Brazil. Samples of accumulated litter on topsoil, topsoil (0–5 cm), and community of epigeal fauna (by pitfall traps) were collected during the dry and rainy seasons. Accumulated litter biomass on the topsoil, concentration of K and Mg in its biomass, abundance of Coleoptera and Pseudoscorpionida, total N and exchangeable K concentrations in the topsoil were the most relevant soil quality indicators, according to the principal component analysis. In both climatic seasons, T5 presented high dissimilarity in relation to the other areas and best soil quality due to its association to higher values of accumulated litter biomass, its nutrient concentration (N, K, Ca, Mg, S), relative frequency or abundance of Coleoptera, Pseudoscorpionida, and Others, concentrations of total organic carbon, total N, available P, exchangeable Ca, extractable acidity, sum of bases, and cation exchange capacity; T1, T2, and T3 were associated to higher values of relative frequency of Formicidae and presented low dissimilarity to each other; T4 was associated to higher values of pH. Therefore, the forest restoration areas have not yet contributed to the general quality of the soil approaching that observed in T5.
The aim of the study was to investigate Pseudobombax aff. petropolitanum (PP) contribution on ann... more The aim of the study was to investigate Pseudobombax aff. petropolitanum (PP) contribution on annual fine litterfall, carbon content, and nutrient concentration, compared to other woody species (OS) on a neotropical inselberg in Espírito Santo state, Brazil. Annual fine litterfall was systematic monthly collected (November 2011-October 2012) by means of 15 littertraps (0.25 m 2) placed in five transects, oven-dried (65 °C, 72 h), weighed, and C content and nutrients concentration (N, P, K, Ca, Mg, S, B, Cu, Fe, Mn, Zn) were estimated. PP performed lower litterfall, C content, and nutrient concentration excepting higher K concentration, compared to OS. The results suggested that PP performed higher nutrient conservation, which indicated its potential in restoring degraded areas observed in the inselberg.
Several tropical woody species are highly responsive to arbuscular mycorrhizal fungi (AMF) and de... more Several tropical woody species are highly responsive to arbuscular mycorrhizal fungi (AMF) and depend on their symbiosis for nutrition and successful establishment in the field. The objective of this study was to evaluate the response of Schinus terebinthifolius, a native species of the Brazilian Atlantic Forest and Caatinga, to inoculation with three AMF species (Dentiscutata heterogama, Gigaspora margarita, and Rhizophagus clarus), either individually or mixed, at different levels of phosphorus fertilization (0, 71, 213, and 650 mg kg-1 of P). We conducted the experiment in 1 kg pots, following a completely randomized design with six replicates per treatment, to evaluate morphological and nutritional traits after 116 days, including stem diameter, plant height, plant biomass, and shoot P content. Our results showed that S. terebinthifolius was highly dependent on mycorrhizae and presented different responses depending on the AMF species. The greatest total biomass accumulation occurred when a mixture of the three AMF species was used, which indicated synergism between the fungi. The highest overall positive response to inoculation were observed at an intermediate P level (213 mg kg-1), and although shoot biomass was reduced at the intermediate P doses, an increase in root biomass compensated for this. These results indicate complementarity as opposed to functional redundancy of the AMF species and highlight the importance of using a mixed inoculum in seedling production of S. terebinthifolius for revegetation programs.
The present study aimed to evaluate the arbuscular mycorrhizal fungi (AMF) ocurrence in two fores... more The present study aimed to evaluate the arbuscular mycorrhizal fungi (AMF) ocurrence in two forest fragments (FF 1 and FF 2) of periodically floodable Restinga, arranged in a gradient of soil water saturation at Marambaia, RJ. Soil samples were collected at a depth of 0-5 cm to evaluate the AMF community and soil atributes. Six AMF species were found, five of them occurred in both areas and Acaulospora scrobiculata were restricted to FF 1. Acaulospora and Glomus were the best-adapted genus to the ecosystem conditions. There was no significant difference between the forest fragments in relation to the species richness. However, spores abundancy was higher in FF 1. Some of these results were influenced by lower values of availability of P, moisture content and temperature in soil at FF 1, in relation to FF 2.
ABSTRACT. Forest plantations may minimize the effects of deforestation in the Amazon. However, th... more ABSTRACT. Forest plantations may minimize the effects of deforestation in the Amazon. However, there are differences among species in terms of their influences on soil recovery. The effects of monospecific plantations of Acacia mangium, Dipteryx odorata, Jacaranda copaia, Parkia decussata,and Swietenia macrophylla, and areas of pasture and native forest on the chemical soil attributes of the Brazilian Amazon were evaluated. One bulked soil sample was collected per plot (0.00-0.05, 0.05-0.10, and 0.10-0.30 m; three plots of 128 m2) in each area. No significant differences in most of the soil attributes were observed among the forest plantations. However, soil K+ and P were higher in the Swietenia macrophylla plantations, while higher values of Ca2+, sum of bases, and pH occurred in Jacaranda copaia plantations. In the native forest, the pH, and P content were lower, whereas the soil organic matter (SOM) content, soil organic carbon (SOC) content, cation exchange capacity (CEC), N con...
In tropical forests, the stage of ecological succession influences the nutrient cycling. This stu... more In tropical forests, the stage of ecological succession influences the nutrient cycling. This study aimed to analyze soil fauna community structure, composition, and leaf litter decomposition in fragments of intermediate-successional and late-successional Submountainous Seasonal Semideciduous Forest (ISF and LSF, respectively). We used a square metal frame to collect 10 samples of the leaf litter layer and surface soil (0.00-0.05 m depth) from each area in the wet and dry seasons. Soil fauna individuals were then extracted using a modified Berlese-Tüllgren funnel. For analysis of leaf litter decomposition, 15 litter bags containing 30 g of senescent leaves were randomly placed on the forest floor of each area in the dry season, and three bags were collected after 60, 90, 120, 150, and 180 days. LSF presented higher value of richness and was more associated with Diptera and Formicidae. There was no clear pattern in evenness and diversity with successional stage. The dissimilarity bet...
The present study aimed to evaluate the occurrence of conflicts between the street arborization a... more The present study aimed to evaluate the occurrence of conflicts between the street arborization and the urban equipments in Taquara, RJ. The quali-quantitative inventory carried in 10% of the sheets in the area showed that there wasn’t any tree in 11,1% of the streets. It was observed the presence of 242 trees elements, wich were distributed in 41 species. The fact that 70,2% of this total presented at least one type of conflict with urban equipments, showed the necessity of developing an appropriate planning of public arborization in the area.
-Agroecological management is considered a model of sustainable agriculture that off ers social, ... more -Agroecological management is considered a model of sustainable agriculture that off ers social, environmental and economic benefi ts. The hypotheses of this study were that agroecological production systems can promote changes in the physical fractions of soil organic matter (SOM) associated with aggregates of diff erent origins, and that the greater diversity of plant species in the production system may favour an increase in the carbon concentration of these aggregates. The aim of this study was to a) determine the mass of the free light fraction (FLF), intra-aggregate light fraction (ILF) and light organic matter fraction (LOM) of biogenic and physiogenic soil aggregates; and b) quantify the organic carbon content of the three light SOM fractions and the residual particulate SOM fraction. Five production systems were evaluated: AgF-Agroforestry system; CSun-Coff ee grown in full sun; CSha-Coff ee grown in shade; FLE-Flemingia grown in alleys; and NT-No-tillage. The aggregates were separated, identifi ed and classifi ed according to their origin or formation pathway into biogenic (formed by biological processes) or physiogenic aggregates (resulting from chemical and physical actions). From these, the mass and carbon content of the FLF, ILF, LOM and residual particulate fractions were quantifi ed. The greater diversity of plant species found in the AgF system has not yet favoured an increase in the carbon content of the aggregates. The longer setup time and the management practices of the CSun system has led to an increase in the carbon content of the organic fractions of the aggregates (3.44-1.63 g kg-1 for C-LOM; 1.93-1.13 g kg-1 for C-FLF). The lowest overall mean values for LOM and ILF were found mainly in the aggregates of the NT system (1.22-1.67 and 1.55-2.20 g kg-1 , respectively), being associated with the shorter time and greater mobilisation of the arable layer. Biogenic aggregation aff orded the highest overall mean values for LOM, and increased the mass of the light fractions (15.5%-27.8% for FLF; 23.4%-8.0% for ILF) and the carbon in the C-LOM, C-FLF and residual particulate fractions (42.3%, 12.9%, and 35.0%, respectively) in the surface layer, suggesting an improvement in soil quality.
The study of soil quality indicators can indicate the efficiency of forest restoration practices.... more The study of soil quality indicators can indicate the efficiency of forest restoration practices. Litter, soil chemical attributes, and soil fauna can be used for this purpose since these factors are linked to each other in nutrient cycling and respond to changes in land use management. The present study aimed to identify accumulated litter biomass on topsoil, its nutrient concentration, composition of the epigeal fauna community, and topsoil chemical attributes as possible soil quality indicators in restoration areas of Atlantic Forest (T1, T2, and T3) with different levels of native tree seedlings richness (29, 58, and 114 species, respectively), pasture (T4), and native forest (T5, control), by three plots (50 × 50 m) in each area, in the municipality of Linhares, Espírito Santo, Brazil. Samples of accumulated litter on topsoil, topsoil (0–5 cm), and community of epigeal fauna (by pitfall traps) were collected during the dry and rainy seasons. Accumulated litter biomass on the topsoil, concentration of K and Mg in its biomass, abundance of Coleoptera and Pseudoscorpionida, total N and exchangeable K concentrations in the topsoil were the most relevant soil quality indicators, according to the principal component analysis. In both climatic seasons, T5 presented high dissimilarity in relation to the other areas and best soil quality due to its association to higher values of accumulated litter biomass, its nutrient concentration (N, K, Ca, Mg, S), relative frequency or abundance of Coleoptera, Pseudoscorpionida, and Others, concentrations of total organic carbon, total N, available P, exchangeable Ca, extractable acidity, sum of bases, and cation exchange capacity; T1, T2, and T3 were associated to higher values of relative frequency of Formicidae and presented low dissimilarity to each other; T4 was associated to higher values of pH. Therefore, the forest restoration areas have not yet contributed to the general quality of the soil approaching that observed in T5.
Vast areas of the Brazilian Amazon have been deforested for the expansion of livestock and the ag... more Vast areas of the Brazilian Amazon have been deforested for the expansion of livestock and the agricultural frontier, which has resulted in soil exhaustion. It is therefore urgent to reduce deforestation and encourage sustainable land use to promote social and economic development in the region. The aim of this study was to evaluate the impact of different land use systems (an agroforestry system, cassava cultivation, non-degraded pasture, native forest) on the chemical properties of the soil (0-40 cm) in the mesoregion of the Juruá Valley, in the state of Acre, Brazil. Principal component analysis showed the soil in the forested area (reference) has greater values for P, Ca 2+ , Mg 2+ , K + , Na + , sum of bases, and cation exchange capacity; while hierarchical cluster analysis suggested little dissimilarity to the soil in the agroforestry system, and high dissimilarity to the soil in the areas of cassava cultivation and pasture. The results therefore support agroforestry as the most sustainable land use system, compared to cassava cultivation or pasture.
Several tropical woody species are highly responsive to arbuscular mycorrhizal fungi (AMF) and de... more Several tropical woody species are highly responsive to arbuscular mycorrhizal fungi (AMF) and depend on their symbiosis for nutrition and successful establishment in the field. The objective of this study was to evaluate the response of Schinus terebinthifolius, a native species of the Brazilian Atlantic Forest and Caatinga, to inoculation with three AMF species (Dentiscutata heterogama, Gigaspora margarita, and Rhizophagus clarus), either individually or mixed, at different levels of phosphorus fertilization (0, 71, 213, and 650 mg kg−1 of P). We conducted the experiment in 1 kg pots, following a completely randomized design with six replicates per treatment, to evaluate morphological and nutritional traits after 116 days, including stem diameter, plant height, plant biomass, and shoot P content. Our results showed that S. terebinthifolius was highly dependent on mycorrhizae and presented different responses depending on the AMF species. The greatest total biomass accumulation occ...
Forest plantations may minimize the effects of deforestation in the Amazon. However, there are di... more Forest plantations may minimize the effects of deforestation in the Amazon. However, there are differences among species in terms of their influences on soil recovery. The effects of monospecific plantations of Acacia mangium, Dipteryx odorata, Jacaranda copaia, Parkia decussata,and Swietenia macrophylla, and areas of pasture and native forest on the chemical soil attributes of the Brazilian Amazon were evaluated. One bulked soil sample was collected per plot (0.00-0.05, 0.05-0.10, and 0.10-0.30 m; three plots of 128 m2) in each area. No significant differences in most of the soil attributes were observed among the forest plantations. However, soil K+ and P were higher in the Swietenia macrophylla plantations, while higher values of Ca2+, sum of bases, and pH occurred in Jacaranda copaia plantations. In the native forest, the pH, and P content were lower, whereas the soil organic matter (SOM) content, soil organic carbon (SOC) content, cation exchange capacity (CEC), N content, H+Al...
The study of soil quality indicators can indicate the efficiency of forest restoration practices.... more The study of soil quality indicators can indicate the efficiency of forest restoration practices. Litter, soil chemical attributes, and soil fauna can be used for this purpose since these factors are linked to each other in nutrient cycling and respond to changes in land use management. The present study aimed to identify accumulated litter biomass on topsoil, its nutrient concentration, composition of the epigeal fauna community, and topsoil chemical attributes as possible soil quality indicators in restoration areas of Atlantic Forest (T1, T2, and T3) with different levels of native tree seedlings richness (29, 58, and 114 species, respectively), pasture (T4), and native forest (T5, control), by three plots (50 × 50 m) in each area, in the municipality of Linhares, Espírito Santo, Brazil. Samples of accumulated litter on topsoil, topsoil (0–5 cm), and community of epigeal fauna (by pitfall traps) were collected during the dry and rainy seasons. Accumulated litter biomass on the topsoil, concentration of K and Mg in its biomass, abundance of Coleoptera and Pseudoscorpionida, total N and exchangeable K concentrations in the topsoil were the most relevant soil quality indicators, according to the principal component analysis. In both climatic seasons, T5 presented high dissimilarity in relation to the other areas and best soil quality due to its association to higher values of accumulated litter biomass, its nutrient concentration (N, K, Ca, Mg, S), relative frequency or abundance of Coleoptera, Pseudoscorpionida, and Others, concentrations of total organic carbon, total N, available P, exchangeable Ca, extractable acidity, sum of bases, and cation exchange capacity; T1, T2, and T3 were associated to higher values of relative frequency of Formicidae and presented low dissimilarity to each other; T4 was associated to higher values of pH. Therefore, the forest restoration areas have not yet contributed to the general quality of the soil approaching that observed in T5.
The aim of the study was to investigate Pseudobombax aff. petropolitanum (PP) contribution on ann... more The aim of the study was to investigate Pseudobombax aff. petropolitanum (PP) contribution on annual fine litterfall, carbon content, and nutrient concentration, compared to other woody species (OS) on a neotropical inselberg in Espírito Santo state, Brazil. Annual fine litterfall was systematic monthly collected (November 2011-October 2012) by means of 15 littertraps (0.25 m 2) placed in five transects, oven-dried (65 °C, 72 h), weighed, and C content and nutrients concentration (N, P, K, Ca, Mg, S, B, Cu, Fe, Mn, Zn) were estimated. PP performed lower litterfall, C content, and nutrient concentration excepting higher K concentration, compared to OS. The results suggested that PP performed higher nutrient conservation, which indicated its potential in restoring degraded areas observed in the inselberg.
Several tropical woody species are highly responsive to arbuscular mycorrhizal fungi (AMF) and de... more Several tropical woody species are highly responsive to arbuscular mycorrhizal fungi (AMF) and depend on their symbiosis for nutrition and successful establishment in the field. The objective of this study was to evaluate the response of Schinus terebinthifolius, a native species of the Brazilian Atlantic Forest and Caatinga, to inoculation with three AMF species (Dentiscutata heterogama, Gigaspora margarita, and Rhizophagus clarus), either individually or mixed, at different levels of phosphorus fertilization (0, 71, 213, and 650 mg kg-1 of P). We conducted the experiment in 1 kg pots, following a completely randomized design with six replicates per treatment, to evaluate morphological and nutritional traits after 116 days, including stem diameter, plant height, plant biomass, and shoot P content. Our results showed that S. terebinthifolius was highly dependent on mycorrhizae and presented different responses depending on the AMF species. The greatest total biomass accumulation occurred when a mixture of the three AMF species was used, which indicated synergism between the fungi. The highest overall positive response to inoculation were observed at an intermediate P level (213 mg kg-1), and although shoot biomass was reduced at the intermediate P doses, an increase in root biomass compensated for this. These results indicate complementarity as opposed to functional redundancy of the AMF species and highlight the importance of using a mixed inoculum in seedling production of S. terebinthifolius for revegetation programs.
The present study aimed to evaluate the arbuscular mycorrhizal fungi (AMF) ocurrence in two fores... more The present study aimed to evaluate the arbuscular mycorrhizal fungi (AMF) ocurrence in two forest fragments (FF 1 and FF 2) of periodically floodable Restinga, arranged in a gradient of soil water saturation at Marambaia, RJ. Soil samples were collected at a depth of 0-5 cm to evaluate the AMF community and soil atributes. Six AMF species were found, five of them occurred in both areas and Acaulospora scrobiculata were restricted to FF 1. Acaulospora and Glomus were the best-adapted genus to the ecosystem conditions. There was no significant difference between the forest fragments in relation to the species richness. However, spores abundancy was higher in FF 1. Some of these results were influenced by lower values of availability of P, moisture content and temperature in soil at FF 1, in relation to FF 2.
ABSTRACT. Forest plantations may minimize the effects of deforestation in the Amazon. However, th... more ABSTRACT. Forest plantations may minimize the effects of deforestation in the Amazon. However, there are differences among species in terms of their influences on soil recovery. The effects of monospecific plantations of Acacia mangium, Dipteryx odorata, Jacaranda copaia, Parkia decussata,and Swietenia macrophylla, and areas of pasture and native forest on the chemical soil attributes of the Brazilian Amazon were evaluated. One bulked soil sample was collected per plot (0.00-0.05, 0.05-0.10, and 0.10-0.30 m; three plots of 128 m2) in each area. No significant differences in most of the soil attributes were observed among the forest plantations. However, soil K+ and P were higher in the Swietenia macrophylla plantations, while higher values of Ca2+, sum of bases, and pH occurred in Jacaranda copaia plantations. In the native forest, the pH, and P content were lower, whereas the soil organic matter (SOM) content, soil organic carbon (SOC) content, cation exchange capacity (CEC), N con...
In tropical forests, the stage of ecological succession influences the nutrient cycling. This stu... more In tropical forests, the stage of ecological succession influences the nutrient cycling. This study aimed to analyze soil fauna community structure, composition, and leaf litter decomposition in fragments of intermediate-successional and late-successional Submountainous Seasonal Semideciduous Forest (ISF and LSF, respectively). We used a square metal frame to collect 10 samples of the leaf litter layer and surface soil (0.00-0.05 m depth) from each area in the wet and dry seasons. Soil fauna individuals were then extracted using a modified Berlese-Tüllgren funnel. For analysis of leaf litter decomposition, 15 litter bags containing 30 g of senescent leaves were randomly placed on the forest floor of each area in the dry season, and three bags were collected after 60, 90, 120, 150, and 180 days. LSF presented higher value of richness and was more associated with Diptera and Formicidae. There was no clear pattern in evenness and diversity with successional stage. The dissimilarity bet...
The present study aimed to evaluate the occurrence of conflicts between the street arborization a... more The present study aimed to evaluate the occurrence of conflicts between the street arborization and the urban equipments in Taquara, RJ. The quali-quantitative inventory carried in 10% of the sheets in the area showed that there wasn’t any tree in 11,1% of the streets. It was observed the presence of 242 trees elements, wich were distributed in 41 species. The fact that 70,2% of this total presented at least one type of conflict with urban equipments, showed the necessity of developing an appropriate planning of public arborization in the area.
Impacto, Excelência e Produtividade das Ciências Agrárias no Brasil 3, 2020
Objetivou-se avaliar a densidade,
riqueza, uniformidade e diversidade da
comunidade da fauna edáf... more Objetivou-se avaliar a densidade, riqueza, uniformidade e diversidade da comunidade da fauna edáfica e atributos químicos da camada superficial do solo (0-5 cm), em um gradiente crescente de impacto antrópico de uso do solo (floresta nativa: FN; cultivo de coqueiro: CO; mandioca: MA), RJ, Rio de Janeiro, Brasil. O delineamento experimental foi inteiramente casualizado, com cinco repetições (parcelas de 20x20m)/área. Os organismos foram extraídos em funis de Berlese-Tüllgren modificados. Maiores valores de densidade de animais, P, K, Mg, pH, soma de bases (SB), e saturação por bases (V%) ocorreram na área de CO. Menores valores de P, Ca, Mg, H+Al, SB, capacidade de troca catiônica efetiva (T) e carbono orgânico (Corg), além de maiores valores de riqueza, uniformidade e diversidade de organismos ocorreram na área de FN. Menor densidade de organismos foi verificada na área de MA. A hipótese de que a comunidade da fauna do solo apresenta maior diversidade na área que recebe impacto antrópico intermediário (CO), na comparação com as áreas com menor (FN) e maior impacto antrópico (MA), não foi corroborada.
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Papers by Rodrigo Camara
riqueza, uniformidade e diversidade da
comunidade da fauna edáfica e atributos químicos da camada superficial do solo (0-5
cm), em um gradiente crescente de impacto
antrópico de uso do solo (floresta nativa: FN;
cultivo de coqueiro: CO; mandioca: MA),
RJ, Rio de Janeiro, Brasil. O delineamento
experimental foi inteiramente casualizado, com
cinco repetições (parcelas de 20x20m)/área.
Os organismos foram extraídos em funis de
Berlese-Tüllgren modificados. Maiores valores
de densidade de animais, P, K, Mg, pH, soma
de bases (SB), e saturação por bases (V%)
ocorreram na área de CO. Menores valores de P,
Ca, Mg, H+Al, SB, capacidade de troca catiônica
efetiva (T) e carbono orgânico (Corg), além de
maiores valores de riqueza, uniformidade e
diversidade de organismos ocorreram na área
de FN. Menor densidade de organismos foi
verificada na área de MA. A hipótese de que
a comunidade da fauna do solo apresenta
maior diversidade na área que recebe impacto
antrópico intermediário (CO), na comparação
com as áreas com menor (FN) e maior impacto
antrópico (MA), não foi corroborada.