The relationship between pasture degradation and soil properties in the Brazilian amazon: a case study

Müller, Marcelo Marques Lopes; Guimarães, M. F.; Desjardins, Thierry; Mitja, Danielle

doi:10.1016/j.agee.2003.12.003

Cited by 53 publications

(35 citation statements)

References 13 publications

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“…Corroborating with these results, Muller et al (2004) did not find any difference in the SOC in pasture at different levels of degradation in an Ultisol in the Amazon region. Therefore, no relations of SOC were established with managements practices, pasture age and/or degree of degradation.…”

Section: Resultssupporting

confidence: 63%

Can Soil Organic Carbon Pools Indicate the Degradation Levels of Pastures in the Atlantic Forest Biome?

Donagemma

Andrade²,

Passos³

et al. 2013

JAS

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In Brazil, a large part of the Atlantic Forest was deforested in pastures, which were developed on the basis of natural fertility and organic matter content of the new deforested soil. However, as time went by the organic matter content in these areas have been decreasing causing soil degradation. The objective of this study was to evaluate the organic matter as a quality indicator of Ultisols in different levels of pasture degradation in the region of Governador Valadares-MG. Four sites of pastures were chosen at different levels of degradation, observed visually, two capoeiras in different stages of natural recovery and forest site (reference). Soil samples were collected at three depths (0.00-0.05, 0.05-0.10 and 10-0.20 m) in two seasons of the year (rainy and dry seasons) in the middle third of the landform with three replicates. The following attributes were determined: soil organic C, free light fraction, particulate organic matter, particulate organic C, mineral-associated organic C and dissolved organic matter. The experimental results showed that the soil organic matter appeared efficient in discriminating soil quality between degraded forest/pasture, as well as between degraded capoeira/pasture. But, it was not sensitive to discriminate within levels of degraded pastures. Among the organic matter pools studied, the most sensitive soil quality indicators were: particulate organic matter and dissolved organic matter, in the following degraded order verified from these indicators: forest < capoeira 1 = capoeira 2 < pastures (1, 2, 3 and 4).

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Section: Resultssupporting

confidence: 63%

Can Soil Organic Carbon Pools Indicate the Degradation Levels of Pastures in the Atlantic Forest Biome?

Donagemma

Andrade²,

Passos³

et al. 2013

JAS

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“…Sabe-se que a castanheira-do-brasil pode atingir até 60 m de altura e dap de até 3 m, porém, há registro de indivíduos com até 5,25 m de dap . De acordo com Phillips et al (2009;, outros fatores que contribuem para as altas taxas de mortalidade de castanheira-do-brasil em áreas de pastagens são: estresse ambiental causado pelas condições climáticas mais extremas, resultantes do desmatamento e fogo repetido; condições edafológicas adversas pelo aumento da compactação do solo e perda de nutrientes (MÜLLER et al, 2004;MARTÍNEZ;ZINCK, 2004) e falta de dossel florestal no entorno das castanheiras-do-brasil, o que torna os indivíduos mais susceptíveis ao tombamento pela ação do vento e das tempestades (SCOLES et al, 2016).…”

Section: Nº De Indivíduos Classe Diamétrica (Dap Cm)unclassified

Caracterização morfométrica de árvores solitárias de Bertholletia excelsa H.B.K. no sudeste de Roraima

Dionísio

Condé

Gomes

et al. 2017

AGRO@MBIENTE ON-LINE

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Para manejar espécies florestais nativas, é necessário conhecer tanto as características quanto a dinâmica das árvores ao longo do tempo, bem como suas relações morfométricas a fim de aperfeiçoar as técnicas silviculturais. Assim, objetivou-se com o presente trabalho avaliar as características morfométricas de árvores solitárias de castanheira-do-brasil (Bertholletia excelsa H.B.K), nos municípios de São João da Baliza e Caroebe, RR. O inventário avaliou 49 indivíduos com diâmetro a altura do peito (dap) ≥10 cm. Foram avaliadas as seguintes variáveis morfométricas: diâmetro à altura do peito, tomado a 1,30 m a partir do nível do solo; altura total (ht), altura comercial do fuste (hc), diâmetro de copa (dc), comprimento de copa (cc), proporção de copa (pc), área de copa (ac), grau de esbeltez (ge), índice de saliência (is), índice de abrangência (ia) e formal de copa (fc). Para o estudo das relações interdimensionais, as variáveis morfométricas foram relacionadas com o dap, mediante análise de regressão. Foi observado que 32,9% dos indivíduos apresentaram ht média de 16,05 m e dap de 49,75 cm; com ac, cc e pc de 12,61 m², 8,18 m e 51,29 m, respectivamente. Os resultados mostraram relações estatísticas significativas entre o dap e as variáveis ht, cc, pc, is, fc e ac. O comprimento, a proporção de copa e o diâmetro de copa apresentaram grande faixa de variação. O formal de copa revelou que as castanheira-do-brasil apresentam copas mais alongadas. É possível ajustar modelos matemáticos significativos em função do dap. São necessárias medidas mais eficientes para garantir a proteção integral desses indivíduos isolados.

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“…Ci. Solo, 36:1724-1732 systems may be related to the formation of biopores and the steady incorporation of organic matter from the decomposition of roots and leaves (Muller et al, 2001(Muller et al, , 2004. Similarly, the loosening of soil particles during tillage operations is significant at this depth (Arkin & Taylor, 1981).…”

Section: Resultsmentioning

confidence: 99%

“…H: Homogeneous, *and **: F test significant at 5 and 1 % level, respectively; ns: not significant. recovery of the Cambisol structure due to formation of biopores and organic matter incorporation from decomposing roots associated with these land use systems (Muller et al, 2001(Muller et al, , 2004.…”

Section: Resultsmentioning

confidence: 99%

Structural sustainability of cambisol under different land use system

Martins¹,

Dias²,

Ajayi

et al. 2012

Rev. Bras. Ciênc. Solo

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SUMMARYIncongruous management techniques have been associated with some significant loss of agricultural land to degradation in many parts of the world. Land degradation results in the alteration of physical, chemical and biological properties of the soil, thereby posing a serious threat to sustainable agricultural development. In this study, our objective is to evaluate the changes in a Cambisol structure under six land use systems using the load bearing capacity model. Sampling was conducted in Amazonas Region, Brazil, in the following land use: a) young secondary forest; b) old secondary forest; c) forest; d) pasture; e) cropping, and f) agroforestry. To obtain the load bearing capacity models the undisturbed soil samples were collected in those land use systems and subjected to the uniaxial compression test. These models were used to evaluate which land use system preserved or degraded the Cambisol structure. The results of the bulk density and total porosity of the soil samples were not adequate to quantify structural degradation in Cambisol. Using the forest topsoil level (0-0.03 m) as a reference, it was observed that pasture land use system was most severe in the degradation of the soil structure while the structure were most preserved under old secondary forest, cropping system and forest. At the subsoil level (0.10-0.13 m depth), the soil structure was most degraded in the cropping land use system while it was most preserved in young secondary forest and pasture. At the 0.20-0.23 m depth, soil structure degradation was most severe in the old secondary forest system and well preserved in young secondary forest, cropping and agroforestry.Index terms: structure degradation, bulk density, precompression stress, Amazonas.(

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The relationship between pasture degradation and soil properties in the Brazilian amazon: a case study

Cited by 53 publications

References 13 publications

Can Soil Organic Carbon Pools Indicate the Degradation Levels of Pastures in the Atlantic Forest Biome?

Can Soil Organic Carbon Pools Indicate the Degradation Levels of Pastures in the Atlantic Forest Biome?

Caracterização morfométrica de árvores solitárias de Bertholletia excelsa H.B.K. no sudeste de Roraima

Structural sustainability of cambisol under different land use system

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