scholarly journals Fertilidade do solo como indicador do efeito de borda em fragmento florestal, Vitória da Conquista, Bahia

2016 ◽  
Vol 11 (4) ◽  
pp. 185
Author(s):  
Danilo Brito Novais ◽  
Joilson Silva Ferreira ◽  
Patrícia Anjos Bittencourt Barreto
Keyword(s):  
Organic Matter ◽  
Organic Carbon ◽  
Soil Fertility ◽  
Edge Effect ◽  
Base Saturation ◽  
Forest Fragment ◽  
Chemical Attributes ◽  
The One ◽  
Composite Samples

Com a expansão da agricultura as florestas têm sido fragmentadas, modificando a dinâmica dos seus processos refletindo na fertilidade do solo. Esse estudo teve como objetivo avaliar o efeito de borda na fertilidade do solo em um fragmento florestal na região Sudoeste da Bahia. Para isso a área foi dividida em faixas verticais iniciando 50 metros após a borda, adentrando até 300 metros no fragmento. Em cada uma das faixas foram tomadas 3 amostras compostas nas profundidades de 0-5, 5-10, 10-20 cm. Analisando os atributos químico e calculando a soma de bases, CTC a pH7 e a saturação por bases (V%). Também foram quantificados os teores de carbono orgânico (COT) nas áreas de estudo. Foram observadas diferenças na fertilidade do solo da borda para o interior do fragmento.  Verificou-se que os atributos Ca2+, H++Al3+, S, T, COT foram os mais sensíveis em relação ao efeito de borda. A área semi-interna (SI) distando 150-200 metros, de maneira geral foi a que apresentou os maiores valores de fertilidade do solo, possivelmente devido aos maiores teores de matéria orgânica acumulada.  Soil fertility as edge effect indicator in a forest fragment, Vitória da Conquista, BahiaAbstract: With the expansion of agriculture forests have been fragmented, changing the dynamics of their processes reflecting soil fertility. This study aimed to evaluate the edge effect on soil fertility in a forest fragment in the Southwest Bahia region. For this area was divided into vertical strips starting 50 meters after the border, entering up to 300 meters in the fragment. In each of the tracks were taken 3 composite samples at depths of 0-5, 5-10, 10-20 cm. Analyzing the chemical attributes and calculating the sum of bases, CTC at pH 7 and base saturation (V%). Also the organic carbon levels were quantified (COT) in the study areas. Differences were observed at the edge of soil fertility into the fragment. It was found that attributes, Ca2+, H++Al3+, S, T, COT were the most sensitive in relation to the edge effect. The semi-internal area (SI) 150-200 meters distant in general was the one with the highest soil fertility values, possibly due to higher levels of accumulated organic matter.

scholarly journals EDGE EFFECT ON CHEMICAL ATTRIBUTES OF SOIL IN A SEASONAL FOREST

2019 ◽  
Vol 43 (1) ◽  
Author(s):  
Patrícia Anjos Bittencourt Barreto-Garcia ◽  
Rafael Nogueira Scoriza ◽  
Alessandro de Paula
Keyword(s):  
Organic Matter ◽  
Edge Effect ◽  
Deciduous Forest ◽  
Superficial Layer ◽  
Soil Samples ◽  
Forest Fragments ◽  
Forest Fragment ◽  
Chemical Attributes ◽  
Pasture Area ◽  
Potential Acidity

ABSTRACT The magnitude of changes in soil attributes can be used to identify the effects of natural or anthropogenic interference on forest fragments. The objective of this work was to evaluate the chemical attributes of the soil as indicators of the edge effect at a Seasonal Semi-deciduous Forest fragment in the Southwest of Bahia, Brazil. Four sampling ranges were defined in the forest fragment (Range 1: 0-10m; Range 2: 40-50 m; Range 3: 80-90 m; and Range 4: 400-410 m from the edge). A degraded native pasture area was used as the reference. Soil samples were collected at depths of 0-5, 5-10 and 10-20 cm. The samples were analyzed for pH and organic matter, P, K, Ca, Mg and Al. The superficial layer of the soil was sensitive to the changes imposed by the fragmentation, reflecting modifications in some of its chemical attributes up to a distance of 90 m from the edge towards the interior of the fragment, with more severe effects in the first 10 meters. Soil organic matter, potential acidity, CEC and pH were the most affected attributes, evidencing a gradient of variation in the edge-interior direction.

scholarly journals Chemical and physical fractions of soil organic matter under various management regimes in Roraima, Brazil

2017 ◽  
Vol 38 (4Supl1) ◽  
pp. 2419
Author(s):  
Marden Daniel Espinoza Guardiola ◽  
José Frutuoso Vale Júnior ◽  
Edmilson Evangelista da Silva ◽  
Celeste Queiroz Rossi ◽  
Marcos Gervasio Pereira
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Organic Carbon ◽  
Chemical Elements ◽  
The Other ◽  
Management Systems ◽  
Natural Fertility ◽  
Chemical Attributes ◽  
Pasture Area ◽  
Physical And Chemical

The crop-livestock integration (CLI) and crop-livestock-forest integration (CLFI) management systems, have been shown to be viable approaches for increasing carbon sequestration in soils, resulting in the improvement of physical and chemical soil attributes. The objective of this study was to evaluate the chemical attributes and organic matter in soils under Natural Forest (NF) converted to different uses and managed differently: rotational pasture area (PAST), crop-livestock integration (CLI), and crop-livestock-forest integration (CLIF). The research was conducted at the São Paulo farm, in Iracema, located in the south-central region of the state of Roraima, Brazil. The studied soil type was classified as Ultisol. Soil samples were taken by opening ditches and examining layers at 0.1-m depth intervals from surface to 0.60-m depth. Total organic carbon (TOC), chemical and granulometric fractionation of soil organic matter (SOM), oxidizable fractions, and light organic matter in water were analyzed. Our results showed low levels of the analyzed chemical elements, a characteristic of a soil with low natural fertility. This matches conditions inherent in source material, weathered by high rainfall, a warm and humid climate, and flat topographic relief. In the 0-0.1 m layer, the PAST and CLI systems had the highest TOC contents relative to the other systems studied. At other depths, there were no statistical differences among TOC levels. The highest concentration of C in the particulate fraction (POC) was noted in the surface layer in all management systems. The pasture system had the highest concentration POC in the top 0.10 m. Our results also showed that the upper 0.10 m of soil in NF contained the lowest content of organic carbon associated with mineral (MOC) relative to the managed agrosystems. In addition, humin provided the largest contribution to SOM in all evaluated management systems. The crop-livestock integration (CLI) and crop-livestock integration forest (CLIF) systems, emerged as a strong alternative to carbon incorporation and subsequently the improvement of physical and chemical soil attributes. The objective of this work to evaluate the chemical attributes and organic matter in soils under Natural forest (NF) converted into different use and management systems: pasture (PAST), crop-livestock Integration (CLI) and crop-livestock Integration forest (CLIF). The research was conducted at São Paulo farm in Iracema, located in the Center-South region of the State of Roraima, Brazil. The soil studied was classified as Argissolo Amarelo Distrófico. The samples were taken by the opening of trenches in layers of 0-0.10, 0.10- 0.20, 0.20- 0.40, and 0.40-0.60 m depth. Total organic carbon (TOC), chemical and granulometric fractionation of soil organic matter (SOM), oxidizable fractions and organic matter in water were analyzed. The results showed low levels of the analyzed chemical elements which characterizes soils with low natural fertility, which matches the conditions of the source material, high rainfall and regional temperature, as well as the flat local relief. In the 0-0.1 m layer, the PAST and CLI systems had the highest TOC contents when compared to the other systems studied, in the other depths there were no statistical differences between the TOC levels. The highest amount of C in the particulate fraction (COp) was verified in the surface layer in all evaluated management systems. The pasture area was the system with the greatest contribution of COp to the depth of 0-0.0 m. In relation to the carbon content associated with minerals (COam), the results showed that the depth of 0-0.05 m NF area presented the lowest levels when compared to the other systems. Regarding the humic substances, there was a larger contribution of humin in all evaluated systems.

scholarly journals Short-Term Changes in Fertility Attributes and Soil Organic Matter Caused by the Addition of EM Bokashis in Two Tropical Soils

2015 ◽  
Vol 2015 ◽  
pp. 1-9
Author(s):  
Carlos Eduardo Pacheco Lima ◽  
Mariana Rodrigues Fontenelle ◽  
Luciana Rodrigues Borba Silva ◽  
Daiane Costa Soares ◽  
Antônio Williams Moita ◽  
...  
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Organic Carbon ◽  
Total Organic Carbon ◽  
Poultry Manure ◽  
Principal Component ◽  
Tropical Soils ◽  
Randomized Design ◽  
Completely Randomized Design ◽  
Chemical Attributes

The present work aimed to evaluate the behavior of ten fertility attributes of soil organic matter physical fractions and total organic carbon upon addition of three EM Bokashis to a Rhodic Ferralsol (FRr) and a Dystric Cambisol (CMd). An experiment was carried out in greenhouse in which the soils were placed into plastic trays and cultivated with tomato. A completely randomized design was used with four repetitions and factorial scheme of 2 × 3 + 2, consisting of two soils (FRr and CMd), three EM Bokashis (Poultry Manure Bokashi (BPM); CNPH Bokashi (BC); and Cattle Manure Bokashi (BCM)), and two controls (both soils without addition of Bokashi). The following fertility attributes were evaluated: pH, Ca2+, Mg2+, K+, Na+, P, SB, H + Al, CEC, andV. Particulate organic carbon (POC) and mineral-associated organic carbon (MOC) and total organic carbon (TOC) were also investigated. Finally, the Principal Component Analysis was conducted in order to identify possible patterns related to soils when fertilized with EM Bokashi. The addition of EM Bokashi increased the soil fertility and contents of POC. Different EM Bokashi presents distinguished effects on each soil. The PCA suggests that BPM presents higher capacity to modify the analyzed chemical attributes.

scholarly journals Soil fertility, organic carbon and fractions of the organic matter at different distances from eucalyptus stumps

2009 ◽  
Vol 33 (3) ◽  
pp. 571-579 ◽  
Author(s):  
Geraldo Erli Faria ◽  
Nairam Félix de Barros ◽  
Roberto Ferreira Novais ◽  
Ivo Ribeiro Silva
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Organic Carbon ◽  
Soil Layer ◽  
Chemical Properties ◽  
Soil Surface ◽  
Light Fraction ◽  
Forest Residues ◽  
Chemical Attributes ◽  
Topsoil Layer

Knowledge on variations in vertical, horizontal and temporal characteristics of the soil chemical properties under eucalyptus stumps left in the soil is of fundamental importance for the management of subsequent crops. The objective of this work was to evaluate the effect of eucalyptus stumps (ES) left after cutting on the spatial variability of chemical characteristics in a dystrophic Yellow Argisol in the eastern coastal plain region of Brazil. For this purpose, ES left for 31 and 54 months were selected in two experimental areas with similar characteristics, to assess the decomposition effects of the stumps on soil chemical attributes. Soil samples were collected directly around these ES, and at distances of 30, 60, 90, 120 and 150 cm away from them, in the layers 0-10, 10-20 and 20-40 cm along the row of ES, which is in-between the rows of eucalyptus trees of a new plantation, grown at a spacing of 3 x 3 m. The soil was sampled in five replications in plots of 900 m² each and the samples analyzed for pH, available P and K (Mehlich-1), exchangeable Al, Ca and Mg, total organic carbon (TOC) and C content in humic substances (HS) and in the free light fraction. The pH values and P, K, Ca2+, Mg2+ and Al3+ contents varied between the soil layers with increasing distance from the 31 and 54-monthold stumps. The highest pH, P, K, Ca2+ and Mg2+ values and the lowest Al3+ content were found in the surface soil layer. The TOC of the various fractions of soil organic matter decreased with increasing distance from the 31 and 54-month-old ES in the 0-10 and 10-20 cm layers, indicating that the root (and stump) cycling and rhizodeposition contribute to maintain soil organic matter. The C contents of the free light fraction, of the HS and TOC fractions were higher in the topsoil layer under the ES left for 31 months due to the higher clay levels of this layer, than in those found under the 54-month-old stumps. However, highest C levels of the different fractions of soil organic matter in the topsoil layer reflect the deposition and maintenance of forest residues on the soil surface, mainly after forest harvest.

scholarly journals Soil organic matter fractions, chemical attributes and aggregation under forestry and agricultural systems

2018 ◽  
Vol 8 (3) ◽  
pp. 459-468
Author(s):  
Cristiane Figueira da Silva ◽  
Marcos Gervasio Pereira ◽  
Júlio César Fernandes Feitosa ◽  
Ariovaldo Machado Fonseca Júnior ◽  
João Henrique Gaia-Gomes ◽  
...  
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Organic Carbon ◽  
Humic Substances ◽  
Secondary Forest ◽  
Agricultural Systems ◽  
Mean Weight Diameter ◽  
P Content ◽  
Chemical Attributes ◽  
Organic Matter Fractions

The aim of this work was to evaluate the influence of the conversion of forest systems to agricultural systems in the organic matter compartments, aggregation and soil chemical attributes, in the Atlantic Forest. The evaluated systems were: annual crop (ACr); perennial agriculture (PAg); pasture; and secondary forest early (SFES), medium (SFMS), and advanced stage (SFAS). Soil samples were collected at the layer of 0-5 cm depth and quantified the total organic carbon (TOC), C of humic substances, oxidizable C, granulometric fractions of soil organic matter (SOM), soil chemical attributes, soil aggregation and glomalin-related soil protein (GRSP-total and GRSP-easily extractable) in different aggregate classes. It was observed a reduction of the TOC, particulate organic carbon (POC), humic substances and oxidizable C in the PAg and ACr areas comparing to pasture and forest systems. Moreover, the pH values increased whereas P content decreased in comparison with SFAS. As for aggregation, the PAg and the ACr decreased by around 35% and 20% the mean weight diameter of aggregates, respectively, compared to the average values found in the forestry systems, and 34% and 45%, respectively in relation to pasture. In general, GRSP-total were reduced by agriculture. Thus, it appears that the agriculture which has been practiced is altering negatively the soil chemical, physical and biological attributes.

scholarly journals SAMPLING OF CHEMICAL ATTRIBUTES IN FOREST SOILS

FLORESTA ◽  
2019 ◽  
Vol 49 (2) ◽  
pp. 305
Author(s):  
Bruno Oliveira Lafetá ◽  
Tamires Mousslech Andrade Penido ◽  
Nivaldo De Souza Martins ◽  
Márcio Leles Romarco de Oliveira ◽  
Danielle Piuzana Mucida ◽  
...  
Keyword(s):  
Organic Matter ◽  
Chemical Analysis ◽  
Forest Soils ◽  
Soil Sampling ◽  
Analysis Techniques ◽  
Minimum Number ◽  
Sample Error ◽  
Chemical Attributes ◽  
Sampling Procedures ◽  
Composite Samples

Information about sample adequacy that represents soil chemical attributes distribution are fundamental for a better rationalization of the use of correctives and fertilizers. The objective was to evaluate the variability of these attributes and to size the minimum number of composite samples to represent the fertility of forest soils. The total area planted was 9,101ha, constituted of 265 commercial eucalypt stands. The 687 soil composite samples obtained were for chemical analysis. It was evaluated the performance of two exploratory analysis techniques and six sampling procedures. The attributes P, K, Ca, Mg and S presented higher coefficient of variation (>35%). In contrast, the distributions of Al, organic matter and, mainly, pH were the most homogeneous. The sample error was smaller as the amount of composite samples increased. The representative of all chemical attributes (sample error of 5%) was achieved with a minimum of 309 (one each 29ha, 1:29) and 295 (1:31) composite samples from sampling procedures simple casual and stratified by altitude class, respectively. Both procedures were promising for soil sampling, especially, when applying the boxplot for identification and removal of outliers.

Effects of mineral and organic fertilizers on soil organic carbon fractions in agricultural chestnut soil

2018 ◽  
Vol 22 (03) ◽  
pp. 103-108
Author(s):  
Enkhtuya D ◽  
Tuul D ◽  
Munkhtsetseg T
Keyword(s):  
Land Use ◽  
Organic Matter ◽  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Soil Fertility ◽  
Active Form ◽  
Chestnut Soil ◽  
Organic Fertilizers ◽  
Stable Form ◽  
Organic C

Soil organic matter can be analyzed on the basis of the different fractions. Changes in the levels of organic matter, caused by land use, can be better understood by alterations in the different fractions. Therefore in order to discover tendency of soil fertility sustainability it is significant to research on stable and labile form fractions of soil organic carbon by advanced methodology and modern technique. Our research work aimedto evaluate the effect of mineral and organic fertilizers on the labile and stable organic carbon of the chestnut soil in Mongolia. The soils samples used in this study we collected from variants of mineral (N60P40K40), organic (biohumus 1t / hec.) Fertilizer and their combination of the Long-term fertilizers experiments of Plant and Agriculture Institute Changes in soil organic C by land use for agricultural purposes occurred mainly in the fraction of particulate organic matter (> 20 μm). The clay and silt fractions were quatified with a Mastersizer S after distruction organic substances and carbonates using H2O2 and HCI and the sand fraction was determined by wet sieving. According to our research, the stable form of organic carbon in chestnut soil is 39, 0-40,1% of the total fine particle size and 59, 9-61,0% of the active form fraction. On the other hand, variants with fertilizer tend to have increased stabile composition of soil organic carbon. It indicates that soil fertility protection and increased stability are possible in the country’s agricultural technology if use mineral and organic fertilizers.

scholarly journals PENGARUH PEMBERIAN BAHAN ORGANIK KIRINYU ( Chromolaena Odorata )TERHADAP PERTUMBUHAN DAN HASIL SAWI (Brasica Juncea ) DI KAWASAN AGROECOTOURISM

AGRICA ◽  
2020 ◽  
Vol 4 (1) ◽  
pp. 1-8
Author(s):  
Agustinus JP Ana saga ◽  
Murdaningsih Murdaningsih
Keyword(s):  
Organic Matter ◽  
Organic Carbon ◽  
Soil Fertility ◽  
Leaf Area ◽  
Plant Height ◽  
Block Design ◽  
Organic Matter Content ◽  
Chromolaena Odorata ◽  
Randomized Block Design ◽  
Wet Weight

This study aimed to explore the effect of Siam weed (Chromolaena odorata)  green manure application on the growth and development of mustard (Brassica juncea) in Kelimutu National Park, Indonesia.  The study was carried out between September and November 2010 in Ende district on the island of Flores, Indonesia, at an altitude of 1500 to 1730 meters above sea level. This study used a randomized block design with four treatments: K0: No Siam weed application, K1: 5 tons/ha Siam weed (2.8kg/plot), K2: 10 tons/ha Siam weed (5.6kg/plots), K3: 15 tons/ha Siam weed (8.4kg/plot), K4: 20 tons/ha Siam weed (11.2kg/plot). Researchers observed plant characteristics (plant height, leaf area, wet weight and number of leaves) and soil fertility indicators (Organic carbon).  Plant organic matter was ground and subsequently analyzed for nutrients using a randomized block design along with lab analysis for soil fertility. The results of this study showed that the application of Siam weed organic matter had no significant effect on mustard plant height, leaf number, leaf area, or wet weight. However, it was found that organic matter application did have a significant effect on soil fertility indicators (organic carbon), and caused an increase in soil organic matter content.

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 Chemical and physical fractions of soil organic matter under various management regimes in Roraima, Brazil

2017 ◽  
Vol 38 (4Supl1) ◽  
pp. 2419
Author(s):  
Marden Daniel Espinoza Guardiola ◽  
José Frutuoso Vale Júnior ◽  
Edmilson Evangelista da Silva ◽  
Celeste Queiroz Rossi ◽  
Marcos Gervasio Pereira
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Organic Carbon ◽  
Chemical Elements ◽  
The Other ◽  
Management Systems ◽  
Natural Fertility ◽  
Chemical Attributes ◽  
Pasture Area ◽  
Physical And Chemical

The crop-livestock integration (CLI) and crop-livestock-forest integration (CLFI) management systems, have been shown to be viable approaches for increasing carbon sequestration in soils, resulting in the improvement of physical and chemical soil attributes. The objective of this study was to evaluate the chemical attributes and organic matter in soils under Natural Forest (NF) converted to different uses and managed differently: rotational pasture area (PAST), crop-livestock integration (CLI), and crop-livestock-forest integration (CLIF). The research was conducted at the São Paulo farm, in Iracema, located in the south-central region of the state of Roraima, Brazil. The studied soil type was classified as Ultisol. Soil samples were taken by opening ditches and examining layers at 0.1-m depth intervals from surface to 0.60-m depth. Total organic carbon (TOC), chemical and granulometric fractionation of soil organic matter (SOM), oxidizable fractions, and light organic matter in water were analyzed. Our results showed low levels of the analyzed chemical elements, a characteristic of a soil with low natural fertility. This matches conditions inherent in source material, weathered by high rainfall, a warm and humid climate, and flat topographic relief. In the 0-0.1 m layer, the PAST and CLI systems had the highest TOC contents relative to the other systems studied. At other depths, there were no statistical differences among TOC levels. The highest concentration of C in the particulate fraction (POC) was noted in the surface layer in all management systems. The pasture system had the highest concentration POC in the top 0.10 m. Our results also showed that the upper 0.10 m of soil in NF contained the lowest content of organic carbon associated with mineral (MOC) relative to the managed agrosystems. In addition, humin provided the largest contribution to SOM in all evaluated management systems. The crop-livestock integration (CLI) and crop-livestock integration forest (CLIF) systems, emerged as a strong alternative to carbon incorporation and subsequently the improvement of physical and chemical soil attributes. The objective of this work to evaluate the chemical attributes and organic matter in soils under Natural forest (NF) converted into different use and management systems: pasture (PAST), crop-livestock Integration (CLI) and crop-livestock Integration forest (CLIF). The research was conducted at São Paulo farm in Iracema, located in the Center-South region of the State of Roraima, Brazil. The soil studied was classified as Argissolo Amarelo Distrófico. The samples were taken by the opening of trenches in layers of 0-0.10, 0.10- 0.20, 0.20- 0.40, and 0.40-0.60 m depth. Total organic carbon (TOC), chemical and granulometric fractionation of soil organic matter (SOM), oxidizable fractions and organic matter in water were analyzed. The results showed low levels of the analyzed chemical elements which characterizes soils with low natural fertility, which matches the conditions of the source material, high rainfall and regional temperature, as well as the flat local relief. In the 0-0.1 m layer, the PAST and CLI systems had the highest TOC contents when compared to the other systems studied, in the other depths there were no statistical differences between the TOC levels. The highest amount of C in the particulate fraction (COp) was verified in the surface layer in all evaluated management systems. The pasture area was the system with the greatest contribution of COp to the depth of 0-0.0 m. In relation to the carbon content associated with minerals (COam), the results showed that the depth of 0-0.05 m NF area presented the lowest levels when compared to the other systems. Regarding the humic substances, there was a larger contribution of humin in all evaluated systems.

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