scholarly journals Soil Chemical attributes under different management systems in Cerrado-Amazon ecotone

2021 ◽  
Vol 10 (7) ◽  
pp. e36210716045
Author(s):  
Amanda da Silva Reis ◽  
Rubson da Costa Leite ◽  
Guilherme Octávio de Sousa Soares ◽  
José Lucas de Sousa Soares ◽  
Flavia Barreira Gonçalves ◽  
...  
Keyword(s):  
Soil Chemistry ◽  
Management Practices ◽  
Secondary Forest ◽  
Principal Component ◽  
Exchange Capacity ◽  
Management Systems ◽  
Native Forest ◽  
Aluminum Saturation ◽  
Chemical Attributes ◽  
System 1

The Cerrado-Amazonas ecotone occupies 4.85% of the Brazilian territory, with almost 60% of its area deforested. Inadequate soil management practices cause changes in the physical, chemical and biological soil attributes. This study aimed to characterize soil chemistry in different management systems, identifying its efficiency. Ten areas were divided into two soil classes (Ultisol and Entisol               quartzipsamment), each comprising a management system (1 - silvopastoral with 30% shade (SP30), 2 - silvopastoral with 60% shade (SP60), 3 - secondary forest, 4 - native forest, 5 – pasture conventional (CP)). The samples were collected at depths of 0-10, 10-20 and 20-40 cm. The chemical attributes of the soil analyzed were pH, P, K +, Ca2 +, Mg2 +, H + Al3 +, Al3 +, sum of bases (SB), effective cation exchange capacity (CEC), CEC at pH 7, saturation base (V%) and aluminum saturation (m%). The data were submitted to principal component analysis and analysis of variance and Tukey's test (p <0.05). There were minor changes in the attributes analyzed in the Entisol management systems, comparing the other systems with the reference system (native forest); however, SP30 was more suitable, as it increased the pH and the values of essential cations in the soil. In Ultisol, the SP60 and CP systems showed higher averages in the studied attributes, it is inferred that these systems have similar efficiency in land use, positioning them as the best systems studied in this soil class.

scholarly journals ATRIBUTOS QUÍMICOS DE LATOSSOLO VERMELHO SUBMETIDO A DIFERENTES MANEJOS

FLORESTA ◽  
2015 ◽  
Vol 45 (2) ◽  
pp. 229
Author(s):  
Ludmila De Freitas ◽  
José Carlos Casagrande ◽  
Ivanildo Amorim de Oliveira ◽  
Milton Cesar Costa Campos
Keyword(s):  
Organic Matter ◽  
Management Practices ◽  
Chemical Properties ◽  
Exchange Capacity ◽  
Agricultural System ◽  
Native Forest ◽  
Continuous Cropping ◽  
Soil Layers ◽  
Aluminum Saturation ◽  
Potential Acidity

A retirada da vegetação natural para implantação de sistema agrícola pode provocar desequilíbrios no solo, conforme o sistema de manejo empregado. Com o objetivo de estudar as alterações em Latossolo Vermelho Distrófico causadas pelo cultivo contínuo de cana-de-açúcar, selecionaram-se três áreas (mata, cana-de-açúcar e reflorestada) adjacentes, no município de Guariba (SP). Em cada área, foram coletadas, aleatoriamente, quatro amostras, nas camadas de 0,0-0,10 m e 0,10-0,20 m. Foram avaliados os atributos químicos pH, matéria orgânica (MO), fósforo (P), potássio (K), cálcio (Ca), magnésio (Mg), alumínio (Al) e acidez potencial (H+Al), e calculados os valores de soma de bases (SB), capacidade de troca de cátions (CTC), saturação por alumínio (m%) e saturação por bases (V%). As análises de agrupamentos e componentes principais permitiram identificar a formação de três grupos, formados por mata nativa, área reflorestada e área com cana-de-açúcar. Os resultados indicam que o uso intensivo do solo alterou os seus atributos químicos. As técnicas de análises multivariadas mostraram que os principais atributos relacionados com os ambientes foram: na mata nativa, a MO, H+Al, m% e Al; na área com cana-de-açúcar, Mg, Ca, V%, SB e CTC. Enquanto que o ambiente reflorestado ficou entre os ambientes mata nativa e cana-de-açúcar.Palavras-chave: Mata nativa; cana-de-açúcar; área reflorestada. AbstractChemical properties of an oxisol under different management practices. The removal of natural vegetation for establishing an agricultural system may lead to soil imbalances according to management system used. Three adjacent areas were selected in Guariba, SP, Brazil, for the purpose of studying changes in a Latossolo Vermelho Distrófico (oxisol) caused by continuous cropping of sugarcane. In each area, four samples were collected in the 0.0-0.10 m and 0.10-0.20 m soil layers. The following chemical properties were evaluated: pH, organic matter (OM), phosphorus (P), potassium (K), calcium (Ca), magnesium (Mg), aluminum (Al), potential acidity (H+Al), and aluminum saturation (m%); and the values of the sum of bases (SB), cation exchange capacity (CEC), and base saturation (V%). Cluster analyses and principal components allowed identification the formation of three groups, made up of native forest, reforested area, and the area planted to sugarcane. Results indicate that intensive use of the soil altered its chemical properties. Multivariate analysis techniques showed that the main properties related to the environment in the native forest area were organic matter, potential acidity, aluminum saturation, and aluminum. In the sugarcane area the properties were Mg, Ca, V%, BS, SB, and CEC. The reforested area was in an intermediate position between the native forest and sugarcane environments.Keywords: Native forest; sugarcane; reforested area.

scholarly journals Effect of three different agronomic conditions on biochemical profile and diversity in the rhizosphere of banana plantations infected with Fusarium oxysporum Race 1

2021 ◽  
Vol 27 (2) ◽  
Author(s):  
Katherine Sánchez-Zúñiga ◽  
◽  
Ana Tapia-Fernández ◽  
William Eduardo Rivera-Méndez ◽  
◽  
...  
Keyword(s):  
Microbial Communities ◽  
Management Practices ◽  
Soil Health ◽  
Chemical Properties ◽  
Principal Component ◽  
Exchange Capacity ◽  
High Fertility ◽  
Fertility Level ◽  
Biochemical Profile ◽  
Agronomic Conditions

Soil microorganisms play an important role as a link in the transfer of nutrients from the rhizosphere. The physical and chemical properties of soil, the metabolic profiles of microbial communities and different crop management practices can enhance our understanding of hizospheric interactions. This study aimed to establish differences in microbial communities associated with banana crops and the biochemical profile in farms under different agronomic conditions. Seven farms with different levels of intervention, management, and fusariosis severity were analyzed. The biochemical profile of the microbial community was determined using EcoPlates and the main substrates consumed by the microbial communities were identified through multivariate principal component analysis (PCA). Seven microorganisms were selected as indicators of nutrient cycles, pathogenicity and soil health. Also, soil chemical indicators were determined through a complete mineral analysis. For the physiological profile of soil microbial populations, it was observed that farms with the same management tend to be metabolically very similar. In the PCA, two principal components explained 90 % of the variance in the data. It was also determined that the genus Bacillus is predominant in all farms and that farm 4 (medium intervention) presented the most favorable values in all factors analyzed. The effective cation exchange capacity values are highlighted in the chemical analyses, which determined that all farms have a high fertility level. The metabolic profile, diversity and richness of each of the different farms were affected by the type of agronomic management used.

Assessing soil-quality indices for subtropical rice-based cropping systems in India

Soil Research ◽  
2016 ◽  
Vol 54 (1) ◽  
pp. 20 ◽  
Author(s):  
Nirmalendu Basak ◽  
Ashim Datta ◽  
Tarik Mitran ◽  
Satadeep Singha Roy ◽  
Bholanath Saha ◽  
...  
Keyword(s):  
Soil Quality ◽  
Cropping Systems ◽  
Principal Component ◽  
Exchange Capacity ◽  
Microbial Biomass C ◽  
Organic C ◽  
Soil Attributes ◽  
Labile C ◽  
Chemical Attributes ◽  
Minimum Dataset

Rice-based cropping systems are the foundation of food security in countries of Southeast Asia, but productivity of such systems has declined with deterioration in soil quality. These systems are different from other arable systems because rice is grown under submergence, and this may require a different set of key soil attributes for maintenances of quality and productivity. A minimum dataset was screened for assessing quality of soils belonging to three Soil Orders (Inceptisols, Entisols and Alfisols) by using statistical and mathematical models and 27 physical, chemical and biological attributes. Surface soils were collected from farmers’ fields under long-term cultivation of rice–potato–sesame cropping systems. Most of the attributes varied significantly among the Soil Orders used. Four or five key attributes were screened for each Soil Order through principal component and discriminate analysis, and these explained nearly 80% and 90% of the total variation in each Soil Order dataset. The attributes were dehydrogenase activity (DHA), available K, cation exchange capacity (CEC) and pHCa for Inceptisols; organic C, pHCa, bulk density, nitrogen mineralisation (Nmin) and β-glucosidase for Entisols; and DHA, very labile C, Nmin and microbial biomass C for Alfisols. Representation of the screened attributes was validated against the equivalent rice yield of the studied system. Among the selected key soil attributes, DHA and CEC for Inceptisols, organic C for Entisols, and Nmin and very labile C for Alfisols were most strongly correlated with system yield (R2 = 0.45, 0.77 and 0.78). Results also showed that biological and chemical attributes were most sensitive for indicating the differences in soil quality and have a strong influence on system yield, whereas soil physical attributes largely varied but did not predict system yield.

scholarly journals Chemical attributes of traditional agriculture and Caatinga managed at different depths in an Inceptisol

2017 ◽  
Vol 21 (1) ◽  
pp. 50-55
Author(s):  
Osvaldo N. de Sousa Neto ◽  
Nildo da S. Dias ◽  
Raniere B. de Lira ◽  
Eulene F. da Silva ◽  
Ana L. L. Ferreira ◽  
...  
Keyword(s):  
Sustainable Management ◽  
Conventional Tillage ◽  
The Other ◽  
Traditional Agriculture ◽  
Native Forest ◽  
Exchangeable Bases ◽  
Caatinga Biome ◽  
Different Depths ◽  
Chemical Attributes ◽  
System 1

ABSTRACT The objective of this work was to evaluate changes in the chemical attributes of an Inceptisol in two areas of sustainable management of the Caatinga Biome and a conventional tillage, compared with the native forest. The areas were managed in the following way: in areas under sustainable management, the Caatinga was thinned in a savanna system (1), and in the other area, the Caatinga was thinned in strips (2); the area under conventional tillage was burned, plowed and harrowed (3), and the native forest (4). The following chemical attributes were analyzed: pH, electrical conductivity, Ca2+, Mg2+, H + Al, P, Na+, K+ and soil organic matter (SOM), calculating CEC and base saturation. The treatments were evaluated using multivariate analysis, at different depths up to 0.52 m. In the Caatinga areas thinned in a savanna system and in strips, the greater availability of exchangeable bases and SOM occurs close to the depth of 0.20 m and, in the area with traditional agriculture, it is limited to 0.10 m. In the area thinned in a savanna system, sodium showed a negative correlation with the other elements.

scholarly journals Interação dos atributos químicos do solo em área com floresta natural e com plantio de laranja (Citrus sinensis L Osb.)

2021 ◽  
Vol 14 (6) ◽  
pp. 3331
Author(s):  
Luis Henrique Rodrigues Mendonça ◽  
Milton César Costa Campos ◽  
Raquel Manhuary de Araújo ◽  
Elilson Gomes de Brito Filho ◽  
Alan Ferreira Leite de Lima ◽  
...  
Keyword(s):  
Spatial Variability ◽  
Citrus Sinensis ◽  
Management Practices ◽  
Natural Forest ◽  
Available Phosphorus ◽  
Multivariate Techniques ◽  
Native Forest ◽  
Chemical Attributes ◽  
Phosphorus And Potassium ◽  
Diagnostic Horizon

Na região amazônica é comum a conversão de ambiente natural para o de cultivo, com isso o solo permanece em constantes modificações. As atividades agrícolas podem incrementar a heterogeneidade do solo provocando alterações nos atributos químicos do solo, decorrente principalmente das atividades de manejo e cultivo. Essas mudanças são mensuráveis e contribuem para caracterizar, avaliar e acompanhar as alterações ocorrida utilizando ferramentas estatísticas. Assim o estudo da variabilidade espacial dos atributos químicos dos solos é particularmente importante especialmente em áreas onde o solo está submetido a diferentes manejos, visando reduzir os efeitos da variabilidade na produção das culturas em função de determinadas práticas de manejo. Dessa forma, este trabalho tem por objetivo avaliar a variabilidade espacial dos atributos químicos em área de floresta natural e com cultivo de laranja em Colorado do Oeste, Rondônia. Foram selecionadas duas áreas de estudo, a primeira sendo a área de floresta nativa e a segunda sob cultivo de laranja em de Colorado do Oeste, Rondônia. Em cada área foi delimitada uma malha com 1.260 m² (42 x 30 m), com 48 pontos e espaçamento regular entre pontos de 6 m. Nos pontos de cruzamento da malha foram coletadas amostras em três profundidades (0,00-0,05; 0,05-0,10 e 0,10-0,20 m), correspondente ao horizonte diagnóstico do solo, perfazendo uma somatória de 144 amostras por área, logo, um total de 288. Serão determinados dos atributos químicos de pH em água, acidez potencial, alumínio trocável, fósforo e potássio disponível, e carbono orgânico. Com a obtenção dos dados, estes foram avaliados por meio de estatística descrita com teste de médias e a realização da análise multivariada. Houve diferença entre as duas áreas, a substituição da vegetação nativa por sistema de cultivo, ocasionou alterações nos atributos químicos do solo. O uso das técnicas multivariadas mostrou-se eficiente na distinção dos ambientes estudados.     Interaction of the chemical attributes of the soil in an area with natural forest and with planting of orange (Citrus sinensis L. Osb.) A B S T R A C TIn the Amazon region it is common to convert from a natural environment to that of cultivation, with this the soil remains in constant modifications. Agricultural activities can increase the heterogeneity of the soil causing changes in the chemical attributes of the soil, mainly due to management and cultivation activities. These changes are measurable and contribute to characterize, evaluate and monitor the changes that have occurred using statistical tools. Thus, the study of the spatial variability of the chemical attributes of soils is particularly important, especially in areas where the soil is subjected to different managements, in order to reduce the effects of variability in the production of crops due to certain management practices. Thus, this work aims to evaluate the spatial variability of chemical attributes in an area of natural forest and with orange cultivation in Colorado do Oeste, Rondônia. Two study areas were selected, the first being the native forest area and the second under orange cultivation in Colorado do Oeste, Rondônia. In each area, a mesh of 1,260 m² (42 x 30 m) was delimited, with 48 points and regular spacing between points of 6 m. At the crossing points of the grid, samples were collected at three depths (0.00-0.05; 0.05-0.10 and 0.10-0.20 m), corresponding to the soil diagnostic horizon, making a sum of 144 samples per area, therefore, a total of 288. The chemical attributes of pH in water, potential acidity, exchangeable aluminum, available phosphorus and potassium, and organic carbon will be determined. Once the data were obtained, they were evaluated using statistics described with the means test and the multivariate analysis. There was a difference between the two areas, the replacement of native vegetation by a cultivation system, caused changes in the chemical attributes of the soil. The use of multivariate techniques proved to be efficient in distinguishing the studied environments.Keywords: Amazon soils, Use and management, Soil occupation.

scholarly journals Correction of Soil Acidity in an Organic System of Shadowed Coffee

2021 ◽  
pp. 1-8
Author(s):  
Victor Casimiro Piscoya ◽  
Cristiane Maria Gonçalves Crespo ◽  
Renisson Neponuceno de Araújo Filho ◽  
Julyane Silva Mendes Policarpo ◽  
Nayane Laisa de Lima Cavalcanti ◽  
...  
Keyword(s):  
Exchange Capacity ◽  
Climatic Conditions ◽  
Soil Samples ◽  
Natural Fertility ◽  
Native Forest ◽  
Organic System ◽  
Nutritional Conditions ◽  
Increase Productivity ◽  
Aluminum Saturation ◽  
Ecological Complex

Through sustainable agriculture it is possible to explore the coffee culture in consortium with native forests in more rugged reliefs, as coffee is a permanent crop in addition to the climatic conditions offered by the swamps that favor its development. Given the above, the present work proposes, based on the acidity results, to quantify  the need for correctives in the soil to obtain a better nutritional use offered by agroforestry cultivation of organic coffee in the shade with favorable results to increase productivity and, consequently, the farmer's profit. The research was carried out at the Várzea da Onça farm, in the Yaguara Ecological Complex, located in the municipality of Taquaritinga do Norte, Borborema plateau, in the Agreste Pernambuco mesoregion. Altitude, it is necessary to adopt appropriate management techniques that guarantee production, soil conservation and biodiversity, proposing soil correction to guarantee the ideal nutritional conditions for coffee growth. For this purpose, soil samples were collected in the Top (T), Hillside (E) and Pedimento (P) ranges at depths of 0-20, 20-40 and 40-60 cm when planting shaded coffee and soil samples from Native Forest (MN) preserved and legally protected from the Brejo de Taquaritinga. Active, exchangeable and potential acidity were analyzed, as well as the sum of bases, the potential and effective cation exchange capacity, base saturation and aluminum saturation. The results obtained were subjected to analysis of variance and the means were tested at 5% by the Tukey test. A potential of the system was found with low to very low natural fertility, with a strongly acidic reaction. Thus, adequate soil management and correction techniques are necessary for the crop to absorb all the nutrients made available by the organic matter present on the surface, concluding that all slopes require liming, the slope of Hillside and Mata Nativa they also need plastering for the culture to develop properly.

scholarly journals Characterization, classification and analysis of the main properties of the Southwestern Goias soil

2016 ◽  
Vol 37 (3) ◽  
pp. 1135 ◽  
Author(s):  
Kathleen Lourenço Fernandes ◽  
Adriana Aparecida Ribon ◽  
José Marques Junior ◽  
Angélica Santos Rabelo de Souza Bahia ◽  
João Tavares Filho
Keyword(s):  
Management Practices ◽  
Principal Component ◽  
Soil Classification ◽  
Component Analysis ◽  
Minor Amount ◽  
Native Forest ◽  
Field Methods ◽  
Physical Chemical ◽  
Main Component Analysis ◽  
Main Component

Characterization of the soil and the grouping of its properties through main component analysis can assist in the classification and observation of the consequences of the conversion of native forest areas in pastures. Such data can aid in management practices. Considering the lack of studies in Cerrado soils of south-western Goias, developed metagranites of Jurubatuba suite, the objective was to classify and study the physical, chemical and mineralogical soil (under native forest and pasture) Southwest of Goias. Soil sampling and classification followed the Field Methods Manual and the Brazilian System of Soil Classification, respectively. The physical, chemical and mineralogical soil were studied, as well as main component analysis made for these attributes. The profile 1 under native forest was classified as “Cambissolo Háplico Tb eutrófico latossólico”. The profile 2 under degraded pasture was rated “Latossolo Amarelo eutrófico típico”. In addition, the profile 3 under rotated pasture was rated as “Latossolo Vermelho eutrófico chernossólico”. It was observed that the “Latossolos” have higher bulk density and soil penetration resistance, indicating greater soil compaction. They showed high amounts of iron oxides and minor amount of nutrients such as calcium and magnesium. The principal component analysis allowed the grouping of profiles into two groups. Group 1 brought together the properties related to “Latossolos”, and the second was related to “Cambissolo” properties. Thus, the principal components analysis aids the understanding of soil properties and the grouping of soils with similar characteristics, the level of order and management.

scholarly journals Portable X-ray fluorescence (pXRF) spectrometry applied to the prediction of chemical attributes in Inceptisols under different land uses

2018 ◽  
Vol 42 (5) ◽  
pp. 501-512 ◽  
Author(s):  
Anita Fernanda dos Santos Teixeira ◽  
David C. Weindorf ◽  
Sérgio Henrique Godinho Silva ◽  
Luiz Roberto Guimarães Guilherme ◽  
Nilton Curi
Keyword(s):  
Soil Fertility ◽  
Management Practices ◽  
Prediction Models ◽  
Chemical Elements ◽  
Base Saturation ◽  
Native Forest ◽  
Land Uses ◽  
X Ray ◽  
Elemental Contents ◽  
Chemical Attributes

ABSTRACT Portable X-ray fluorescence (pXRF) spectrometry has been increasingly adopted for varying studies worldwide. This work aimed at characterizing effects of soil management on the content of chemical elements detected by pXRF in managed and unmanaged areas of Inceptisols, and evaluating the potential of using pXRF data to generate prediction models for soil fertility attributes, evaluating the effect of land uses on such models. Samples were collected in A, B, and C horizons of soils under native forest, native Cerrado, coffee crops with 1 and 5 years of implantation and eucalyptus. Soil fertility attributes were determined through laboratory analyses, whereas, elemental contents were obtained through pXRF analysis. PXRF data were used for modeling (regressions) and validation of soil fertility attributes and necessity of lime (NL) application, with or without distinction between managed and unmanaged areas. Management practices on coffee crops increased the levels of Sr, CaO, P2O5, Cu, and Zn. CaO content was efficient for prediction of exchangeable Ca2+ contents (R2 = 0.91), pH (R2 = 0.88), base saturation (R2 = 0.89) in managed areas. General models presented adequate results to predict exchangeable Ca2+ (R2 = 0.92), pH (R2 = 0.85), and base saturation (R2 = 0.90). Models for unmanaged areas were less effective. PXRF detected modifications in elemental contents caused by management practices and provided reliable predictions of soil fertility attributes.

scholarly journals Soil Chemical Attributes under Crop-Livestock-Forest Integration System and in Different Land Uses in Mata dos Cocais Region

2018 ◽  
Vol 10 (4) ◽  
pp. 370
Author(s):  
Victor Roberto Ribeiro Reis ◽  
Diana Signor Deon ◽  
Luciano Cavalcante Muniz ◽  
Uelson Serra Garcia ◽  
Ilka South de Lima Cantanhêde ◽  
...  
Keyword(s):  
Exchange Capacity ◽  
Base Saturation ◽  
Native Vegetation ◽  
Native Forest ◽  
Land Uses ◽  
Integration System ◽  
Degraded Pasture ◽  
Soil Cation Exchange Capacity ◽  
Chemical Attributes ◽  
Potential Acidity

The sustainability of ecosystems is closely linked with the assessment of soil properties that estimate their quality. This work proposes to evaluate soil chemical attributes as a function of the implantation of a crop-livestock-forest integration system (ICLF) in the region of Mata dos Cocais in the state of Maranhão, Northeast Brazil. The four different land uses evaluated were native vegetation with babassu, capoeira vegetation, degraded pasture and area under ICLF system (with marandu grass, maize and eucalyptus consortium). The samples were collected up to one meter deep, comprising seven layers: 0.00-0.10, 0.10-0.20, 0.20-0.30, 0.30-0.40, 0.40-0.60, 0.60-0.80 and 0.80-1.0 m. The chemical attributes evaluated were pH, Ca, Mg, Al, P, K and Na, potential acidity, base sum, base saturation and soil cation exchange capacity (CEC). The levels of P, in the 0.00-0.10 m layer, were higher in the ICLF system than those of the native forest with babassu. The levels of K in the ICLF system and degraded pasture were higher than the other land uses up to a depth of 0.40 m, ranging from 0.92 cmolc dm-3 to 0.62 cmolc dm-3 and 1.04 cmolc dm-3 and 0.67 cmolc dm-3, respectively. Base saturation was higher in soils under ICLF system and degraded pasture than those observed in native forest and capoeira vegetation. There was an effect in chemical attributes of the soil such as a function of land use and, in general, the highest values were found in areas with degraded pasture and ICLF.

scholarly journals Soil attributes under agroecosystems and forest vegetation in the coastal tablelands of northestern Brazil

2012 ◽  
Vol 36 (6) ◽  
pp. 649-664 ◽  
Author(s):  
João Bosco Vasconcellos Gomes ◽  
Marcelo Ferreira Fernandes ◽  
Antonio Carlos Barreto ◽  
José Coelho de Araújo Filho ◽  
Nilton Curi
Keyword(s):  
Exchange Capacity ◽  
Northeastern Brazil ◽  
Microbial Biomass C ◽  
Multivariate Techniques ◽  
Native Forest ◽  
Strongly Correlated ◽  
Organic C ◽  
Soil Attributes ◽  
Chemical Attributes ◽  
Physical And Chemical

This study evaluated the changes occurred in a set of soil attributes, particularly those related to the dynamics of soil organic carbon (SOC), as a function of the replacement of native forest for agricultural ecosystems of regional importance in the coastal tablelands of Northeastern Brazil (orange, coconut, eucalyptus and sugarcane). Six commercial sites under these agroecosystems were compared to neighboring areas of native forest in five areas along this region (Coruripe, Umbaúba, Acajutiba, Cruz das Almas and Nova Viçosa). Soil samples were taken from 0-5 and 5-20 cm depth and analyzed for particle size distribution, bulk density, organic C (OC), particulate organic matter, C in soil solution, microbial biomass C, total cation exchange capacity and water stable aggregates. Linear correlation and multivariate techniques were used for data analysis. The values of base saturation and Al saturation for the 0-20 cm depth layer were also calculated. In all the studied areas, soils under native forest presented better status of physical and chemical attributes than their agroecosystem counterparts, especially in the 0-5 cm layer. For both layers, OC content was the attribute most strongly correlated with the overall changes in all attributes. Unexpectedly, the OC content showed no significant correlation with the sum of silt and clay contents. The set of variables investigated in this study is sensitive to differentiate the quality of soils under perennial and semi-perennial land uses from their counterparts under natural vegetation in the landscapes of the coastal tablelands of Northeastern Brazil.

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