Texture and organic carbon relations described by a profile pedotransfer function for Brazilian Cerrado soils

Zinn, Yuri Lopes; Lal, Rattan; Resck, D. V. S.

doi:10.1016/j.geoderma.2005.02.010

Cited by 140 publications

(86 citation statements)

References 18 publications

(25 reference statements)

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“…This positive relationship between the clay content and the OC concentration was demonstrated by Zinn et al (2005). Moreover, in the soils with the highest clay content, clay flocculation and stable aggregate formation are favored.…”

Section: Soil Nutrient Concentrations At Different Distances From Thementioning

confidence: 78%

“…On the other hand, Christensen (1992) stated that due to the reduced specific surface and surface charge density of sands, this particle has little or no highly connected organic matter. It is also poor in organo-mineral complexes, which results in a greater amount of readily available OC to microorganisms, resulting in a lower OC concentration in soils with higher sand contents (Zinn et al, 2005).…”

Section: Soil Nutrient Concentrations At Different Distances From Thementioning

confidence: 99%

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

Faria

Barros²,

Novais³

et al. 2009

Rev. Bras. Ciênc. Solo

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SUMMARYKnowledge 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 m 2 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, Ca 2+ , Mg 2+ and Al 3+ contents varied between the soil layers with increasing distance from the 31 and 54-monthold stumps. The highest pH, P, K, Ca 2+ and Mg 2+ values and the lowest Al 3+ 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.Index terms: nutrients, humic substances, spatial variability. RESUMO: FERTILIDADE DO SOLO, CARBONO ORGÂNICO E FRAÇÕES DA MATÉRIA ORGÂNICA EM DIFERENTES DISTÂNCIAS DA CEPA DE EUCALIPTOO conhecimento das variações vertical, horizontal e temporal de características químicas do solo sob cepas remanescentes de eucalipto é de fundamental importância para o manejo de cultivos subsequentes. O objetivo deste trabalho foi avaliar o efeito de cepas remanescentes de eucalipto (CRE) na variabilidade espacial de características químicas em um Argissolo Amarelo distrófico típico localizado na região litorânea do Espírito Santo. Para isso, foram selecionadas CRE com 31 e 54 meses de idade, em duas áreas experimentais com características semelhantes, a fim de avaliar os efeitos da decomposição delas sobre características químicas do solo. Dessa forma, amostras de solo foram coletadas ao redor dessas CRE e nas distância...

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Section: Soil Nutrient Concentrations At Different Distances From Thementioning

confidence: 78%

Section: Soil Nutrient Concentrations At Different Distances From Thementioning

confidence: 99%

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

Faria

Barros²,

Novais³

et al. 2009

Rev. Bras. Ciênc. Solo

View full text Add to dashboard Cite

show abstract

“…For this reason, for a number of soil properties and in a certain physiographic and bioclimatic environment, soil units by definition are not the fundamental criteria for spatialization. A new hierarchical classification for soil units must be established for each of these soil properties that wisely uses soil variables to define soil units (Zinn et al, 2005). A good profile database should provide a statistical description of each level of this new classification and allow for an extensive analysis of the correlations with regard to the property of interest (Goidts and van Wesemael, 2007 …”

Section: Discussionmentioning

confidence: 99%

Landscape and soil regionalization in southern Brazilian Amazon and contiguous areas: methodology and relevance for ecological studies

Volkoff

Mello²,

Maia

et al. 2012

Sci. agric. (Piracicaba, Braz.)

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Soils of a large tropical area with differentiated landscapes cannot be treated uniformly for ecological applications. We intend to develop a framework based on physiography that can be used in regional applications. The study region occupies more than 1.1 million km 2 and is located at the junction of the savanna region of Central Brazil and the Amazon forest.It includes a portion of the high sedimentary Central Brazil plateau and large areas of mostly peneplained crystalline shield on the border of the wide inner-Amazon low sedimentary plain.A first broad subdivision was made into landscape regions followed by a more detailed subdivision into soil regions. Mapping information was extracted from soil survey maps at scales of 1:250000-1:500000. Soil units were integrated within a homogenized legend using a set of selected attributes such as taxonomic term, the texture of the B horizon and the associated vegetation. For each region, a detailed inventory of the soil units with their area distribution was elaborated. Ten landscape regions and twenty-four soil regions were recognized and delineated.Soil cover of a region is normally characterized by a cluster composed of many soil units. Soil diversity is comparable in the landscape and the soil regions. Composition of the soil cover is quantitatively expressed in terms of area extension of the soil units. Such geographic divisions characterized by grouping soil units and their spatial estimates must be used for regional ecological applications.

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“…Conversely, no-tillage (NT), combined with large crop residues left on soil, has been shown to be an effective agricultural practice for C sequestration and mitigation of GHG emissions (West and Post, 2002;Carvalho et al, 2009). However, in addition to management practices, SOM dynamics are markedly dependent on site-specific factors such as soil type, climate, and antecedent (original) stocks (Zinn et al, 2005a;Dieckow et al, 2009). …”

Section: Introductionmentioning

confidence: 99%

Changes in Soil Organic Carbon and Nitrogen Stocks in Long-Term Experiments in Southern Brazil Simulated with Century 4.5

Weber

Mielniczuk

Tornquist

2016

Rev. Bras. Ciênc. Solo

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ABSTRACT:The Century model has successfully simulated soil organic matter dynamics in many agroecosystems. However, initial applications in southern Brazil produced mixed results. The objective of this study was to calibrate and validate Century 4.5 to simulate soil carbon (C) and nitrogen (N) dynamics under diverse soil management practices in subtropical Brazil. Soil C and N data from two long-term experiments established on a degraded Acrisol in the early 1980s were used. Treatments were conventional or no-tillage; grass or grass/legume cropping systems; and corn with or without mineral N fertilizer. The calibration process iteratively modified model parameters to match simulated values of C additions and Soil Organic Carbon (SOC) and Soil Organic Nitrogen (SON) stocks to field data measured throughout the 25 years of the experiments. Improved fit between measured and observed data was obtained after key parameter changes. Soil C and N stocks were simulated accurately after these modifications were implemented. Other experimental treatments were used to validate the model. Century successfully simulated increases in C and N stocks under no-tillage cropping systems including legumes. However, the model overestimated Soil Organic Matter (SOM) decomposition in treatments with low N availability, like oat/corn without N fertilizer. Overall, Century version 4.5 showed adequate performance in simulating C and N trajectories of contrasting cropping systems commonly found in southern Brazil. The few discrepancies between measured and modeled SOC stocks do not preclude using Century in regional-scale applications to assess impacts of agricultural practices on soil C and N in southern Brazil.

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Texture and organic carbon relations described by a profile pedotransfer function for Brazilian Cerrado soils

Cited by 140 publications

References 18 publications

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

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

Landscape and soil regionalization in southern Brazilian Amazon and contiguous areas: methodology and relevance for ecological studies

Changes in Soil Organic Carbon and Nitrogen Stocks in Long-Term Experiments in Southern Brazil Simulated with Century 4.5

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