Comparaçao de métodos de determinação do carbono orgânico em solos cultivados com eucalipto

Gatto, Alcides; Barros, Nairam Félix de; Novais, Roberto Ferreira; Silva, Ivo Ribeiro; Mendonça, Eduardo de Sá; Villani, Ecila Mercês de Albuquerque

doi:10.1590/s0100-06832009000300026

Cited by 29 publications

(20 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Among the physical indicators, soil texture, aggregation, moisture, porosity, and bulk density (BD) have been used in studies, and among the chemical indicators, TC and TN, mineral nutrients, organic matter, and cation exchange capacity, among others, are well established (Cardoso et al 2013). The soil organic carbon affects important functional processes in soil, such as the storage of nutrients (mainly N), water holding capacity, and stability of aggregates (Gatto et al 2009). It is also a key component of soil fertility, especially under tropical conditions, which must be considered in assessments of soil health (Cardoso et al 2013).…”

Section: Soil Analysismentioning

confidence: 99%

Impact of forest disturbances on soil properties: a case study in Mon State, Myanmar

Bol

Tokuchi

2018

Tropics

View full text Add to dashboard Cite

Communities in Myanmar rely heavily on forests for various uses, but there have been few studies on disturbance to tropical evergreen forests in the country. There is a growing need to evaluate the responses after disturbances relating to soil condition to inform sustainable forest management practices to all regulating agencies. This study assessed the impact of forest disturbances on soil properties in a tropical evergreen forest ecosystem in Myanmar. Soil samples were collected from the sites with three different types of forest disturbance, namely 1) shifting cultivation (≥15 years post-abandonment), 2) landslide (20 years post-landslide), 3) selective logging ( 30 years post-logging), and 4) old growth forest (no recorded history of disturbance over the last 80 years), to determine the effects of forest disturbances on soil carbon (C), nitrogen (N), available phosphorus (AP), pH, and bulk density (BD). Soil C, N, and AP concentrations were significantly higher in old growth forest soils than in the other disturbed forests, while BD was lowest in old growth forest soils. There were no significant differences in soil properties between soil depths, except in BD. Selective logging area soils had the lowest C, N, and pH values, and AP may be severely depleted in areas of shifting cultivation. Our results confirm that forest disturbances can alter soil properties and that the impacts differ among forest disturbance types. Forest areas were slashed and burned for cultivation, cleared by landslides, and selectively logged during harvesting time, and after abandonment, the soil conditions determined the recovery pattern of the forest. According to our results, a logging cycle of more than 30 years is essential to mitigate the influences of logging on soil nutrients.

show abstract

Section: Soil Analysismentioning

confidence: 99%

Impact of forest disturbances on soil properties: a case study in Mon State, Myanmar

Bol

Tokuchi

2018

Tropics

View full text Add to dashboard Cite

show abstract

“…Soil analyses from the upper 5 cm of a clayey Oxisol of Central Brazil (Cerrado biome) cropped to different maize rotations were provided by Coser [49], while those from Segnini [117] also corresponded to Oxisols but from the Northern São Paulo state. In a third study [118], soil total C data came from different soils planted to eucalyptus from eastern Minas Gerais, including Oxisols. Finally, a dataset from Fernandes [119] comprehended seventeen top soil samples, including eleven Oxisols, four Inceptisols, one Spodosol, and one Histosol from different locations in Brazil.…”

Section: Laboratory Analysis-walkley-black Titration Methods (Wb) Versmentioning

confidence: 99%

Review of Soil Organic Carbon Measurement Protocols: A US and Brazil Comparison and Recommendation

et al. 2017

View full text Add to dashboard Cite

Soil organic carbon (SOC) change influences the life-cycle assessment (LCA) calculations for globally traded bio-based products. Broad agreement on the importance of SOC measurement stands in contrast with inconsistent measurement methods. This paper focuses on published SOC research on lands managed for maize (Zea mays L.) in the U.S. and sugarcane (Saccharum officinarum L.) in Brazil. A literature review found that reported SOC measurement protocols reflect different sampling strategies, measurement techniques, and laboratory analysis methods. Variability in sampling techniques (pits versus core samples), depths, increments for analysis, and analytical procedures (wet oxidation versus dry combustion) can influence reported SOC values. To improve consistency and comparability in future SOC studies, the authors recommend that: (a) the methods applied for each step in SOC studies be documented; (b) a defined protocol for soil pits or coring be applied; (c) samples be analyzed at 10 cm intervals for the full rooting depth and at 20 cm intervals below rooting until reaching 100 cm; (d) stratified sampling schemes be applied where possible to reflect variability across study sites; (e) standard laboratory techniques be used to differentiate among labile and stable SOC fractions; and (f) more long-term, diachronic approaches be used to assess SOC change. We conclude with suggestions for future research to further improve the comparability of SOC measurements across sites and nations.

show abstract

“…The methods used for chemical and physical analysis of organic soils have been called into question in other studies (Pereira et al, 2006;Gatto et al, 2009). Most procedures are calibrated to mineral soils, hindering interpretation of results.…”

Section: Model Evaluation: Error Parametersmentioning

confidence: 99%

“…Carbon content in soils that make up the database was determined by different methods, such as combustion in a muffle furnace, titration with dichromate (Walkley and Black, 1934;Yeomans and Bremner, 1988), and automatic elemental analyzers (CHN), which commonly increases variation in C content among the samples (Pereira et al, 2006;Gatto et al, 2009). These variations may have affected the validation parameters of the equations produced.…”

Section: Model Evaluation: Error Parametersmentioning

confidence: 99%

Bulk Density Prediction for Histosols and Soil Horizons with High Organic Matter Content

Beutler

Pereira

Tassinari

et al. 2017

Rev. Bras. Ciênc. Solo

View full text Add to dashboard Cite

Bulk density (Bd) can easily be predicted from other data using pedotransfer functions (PTF). The present study developed two PTFs (PTF1 and PTF2) for Bd prediction in Brazilian organic soils and horizons and compared their performance with nine previously published equations. Samples of 280 organic soil horizons used to develop PTFs and containing at least 80 g kg -1 total carbon content (TOC) were obtained from different regions of Brazil. The multiple linear stepwise regression technique was applied to validate all the equations using an independent data set. Data were transformed using Box-Cox to meet the assumptions of the regression models. For validation of PTF1 and PTF2, the coefficient of determination (R 2 ) was 0.47 and 0.37, mean error -0.04 and 0.10, and root mean square error 0.22 and 0.26, respectively. The best performance was obtained for the PTF1, PTF2, Hollis, and Honeysett equations. The PTF1 equation is recommended when clay content data are available, but considering that they are scarce for organic soils, the PTF2, Hollis, and Honeysett equations are the most suitable because they use TOC as a predictor variable. Considering the particular characteristics of organic soils and the environmental context in which they are formed, the equations developed showed good accuracy in predicting Bd compared with already existing equations.

show abstract

Comparaçao de métodos de determinação do carbono orgânico em solos cultivados com eucalipto

Cited by 29 publications

References 5 publications

Impact of forest disturbances on soil properties: a case study in Mon State, Myanmar

Impact of forest disturbances on soil properties: a case study in Mon State, Myanmar

Review of Soil Organic Carbon Measurement Protocols: A US and Brazil Comparison and Recommendation

Bulk Density Prediction for Histosols and Soil Horizons with High Organic Matter Content

Contact Info

Product

Resources

About