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Registro Completo |
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Biblioteca(s): |
Embrapa Semiárido; Embrapa Unidades Centrais. |
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Data corrente: |
09/07/1996 |
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Data da última atualização: |
07/10/2003 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
REDDY, S. J. |
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Título: |
Climatic fluctuations and homogenization of northeast Brazil using precipitation data. |
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Ano de publicação: |
1984 |
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Fonte/Imprenta: |
Pesquisa Agropecuaria Brasileira, Brasilia, v.19, n.5, p. 529-543, maio 1984. |
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Idioma: |
Inglês |
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Conteúdo: |
In order to assess the cyclic variations in the precipitation series and to homogenize the precipitation regimes of the Northeast Brazil 70-years annual precipitation data of 105-locations were subjected to power spectrum analysis. In terms of some cycles the regions above and below 8oS lat. differ significantly. Also regions between 4-8oS lat. are different in some respects from regions above 4oS lat. This is true with respect to coefficient of variation of annual precipitation. The agreement in general is good with few exceptions. the some predicted curve is also used to compare with the observed precipitation auto-regression of Fortaleza data of 1849 to 1981 revealed the presence of four cycles, namely 52, 26, 13 and 6.5 years. The integrated curve of these four cycles is compared with the observed precipitation. The agreemetn in general is good with few exceptions. The some predicted curve is also used to compare with the observed precipitation at few other locations. The agreement is good only for feew regions coefficient of variation of annual precipitation presented a non-homogenity over regions above 8oS lat. compared to regions below 8oS lat. This is also true even with the observed cycles. This type of discrepancy is attributed to the non-homogeneity in the data series, which is also substantiated with few examples. This study demonstrates that the basic precipitation data must be corrected for homogeneity before they are actually used in the agricultural productivity estimates or planning strategies using regression approach. MenosIn order to assess the cyclic variations in the precipitation series and to homogenize the precipitation regimes of the Northeast Brazil 70-years annual precipitation data of 105-locations were subjected to power spectrum analysis. In terms of some cycles the regions above and below 8oS lat. differ significantly. Also regions between 4-8oS lat. are different in some respects from regions above 4oS lat. This is true with respect to coefficient of variation of annual precipitation. The agreement in general is good with few exceptions. the some predicted curve is also used to compare with the observed precipitation auto-regression of Fortaleza data of 1849 to 1981 revealed the presence of four cycles, namely 52, 26, 13 and 6.5 years. The integrated curve of these four cycles is compared with the observed precipitation. The agreemetn in general is good with few exceptions. The some predicted curve is also used to compare with the observed precipitation at few other locations. The agreement is good only for feew regions coefficient of variation of annual precipitation presented a non-homogenity over regions above 8oS lat. compared to regions below 8oS lat. This is also true even with the observed cycles. This type of discrepancy is attributed to the non-homogeneity in the data series, which is also substantiated with few examples. This study demonstrates that the basic precipitation data must be corrected for homogeneity before they are actually used in the agricultural productiv... Mostrar Tudo |
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Palavras-Chave: |
Ciclos; Climatic; Cycles; Flutuacao; Nordeste; Northeast; Poder de espectro; Power; Precipitação; Precipitacao pluviometrica; Recursos naturais; Regime; Spectrum. |
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Thesagro: |
Análise; Clima; Homogeneização. |
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Thesaurus Nal: |
climate; homogenization. |
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Categoria do assunto: |
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P Recursos Naturais, Ciências Ambientais e da Terra |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/143577/1/7902-1.pdf
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Marc: |
LEADER 02443naa a2200337 a 4500
001 1104728
005 2003-10-07
008 1984 bl uuuu u00u1 u #d
100 1 $aREDDY, S. J.
245 $aClimatic fluctuations and homogenization of northeast Brazil using precipitation data.
260 $c1984
520 $aIn order to assess the cyclic variations in the precipitation series and to homogenize the precipitation regimes of the Northeast Brazil 70-years annual precipitation data of 105-locations were subjected to power spectrum analysis. In terms of some cycles the regions above and below 8oS lat. differ significantly. Also regions between 4-8oS lat. are different in some respects from regions above 4oS lat. This is true with respect to coefficient of variation of annual precipitation. The agreement in general is good with few exceptions. the some predicted curve is also used to compare with the observed precipitation auto-regression of Fortaleza data of 1849 to 1981 revealed the presence of four cycles, namely 52, 26, 13 and 6.5 years. The integrated curve of these four cycles is compared with the observed precipitation. The agreemetn in general is good with few exceptions. The some predicted curve is also used to compare with the observed precipitation at few other locations. The agreement is good only for feew regions coefficient of variation of annual precipitation presented a non-homogenity over regions above 8oS lat. compared to regions below 8oS lat. This is also true even with the observed cycles. This type of discrepancy is attributed to the non-homogeneity in the data series, which is also substantiated with few examples. This study demonstrates that the basic precipitation data must be corrected for homogeneity before they are actually used in the agricultural productivity estimates or planning strategies using regression approach.
650 $aclimate
650 $ahomogenization
650 $aAnálise
650 $aClima
650 $aHomogeneização
653 $aCiclos
653 $aClimatic
653 $aCycles
653 $aFlutuacao
653 $aNordeste
653 $aNortheast
653 $aPoder de espectro
653 $aPower
653 $aPrecipitação
653 $aPrecipitacao pluviometrica
653 $aRecursos naturais
653 $aRegime
653 $aSpectrum
773 $tPesquisa Agropecuaria Brasileira, Brasilia$gv.19, n.5, p. 529-543, maio 1984.
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Registro original: |
Embrapa Unidades Centrais (AI-SEDE) |
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Tipo/Formato |
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Registro |
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Voltar
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Registro Completo
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Biblioteca(s): |
Embrapa Solos. |
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Data corrente: |
29/08/2022 |
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Data da última atualização: |
29/08/2022 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
A - 1 |
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Autoria: |
PESSOA, L. G. M.; FREIRE, M. B. G. dos S.; GREEN, C. H. M.; MIRANDA, M. F. A.; ARAUJO FILHO, J. C. de; PESSOA, W. R. L. S. |
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Afiliação: |
LUIZ G. M. PESSOA, UNIVERSIDADE FEDERAL RURAL DE PERNAMBUCO; MARIA B. G. DOS S. FREIRE, UNIVERSIDADE FEDERAL RURAL DE PERNAMBUCO; COLLEEN H. M. GREEN, NATIONAL OPERATIONS CENTER; MÁRCIO F. A. MIRANDA, INSTITUTO FEDERAL DE PERNAMBUCO; JOSE COELHO DE ARAUJO FILHO, CNPS; WAGNER R. L. S. PESSOA, UNIVERSIDADE ESTADUAL DO PIAUÍ. |
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Título: |
Assessment of soil salinity status under different land-use conditions in the semiarid region of Northeastern Brazil. |
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Ano de publicação: |
2022 |
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Fonte/Imprenta: |
Ecological Indicators, v. 141, 109139, Aug. 2022. |
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DOI: |
https://doi.org/10.1016/j.ecolind.2022.109139 |
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Idioma: |
Inglês |
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Conteúdo: |
Soil salinization and sodification, caused by inadequate land management, is one of the main threats to the semiarid agroecosystems. It is essential to investigate saline levels under different land-use conditions to maintain the sustainability of agricultural production. The main objective of this study was to diagnose the salinity status of the soil in different land-use conditions in the semiarid region of Northeast Brazil. Soil samples were collected in the surface layer (0-5 cm) of three different land-use conditions: areas of low salinity (native vegetation - Caatinga), areas of different saline levels (cultivated areas), and areas of very high salinity (desertified by salinity), and compared regarding the chemical attributes of the soils by descriptive and multivariate analysis. The results showed that sodium and chloride were the predominant soluble ions in cultivated and desertified areas due to saline waters commonly used in the study region. Increases in electrical conductivity values of 1219 and 23207% were observed for cultivated and desertified areas, respectively, compared to areas of native vegetation. The principal component analysis contributed to identifying parameters responsible for the variation in soil salinity, and the second factor identified that percentage of exchangeable sodium, electrical conductivity, and exchangeable and soluble sodium plays an essential role in soil desertification. However, calcium, magnesium, sodium, and chloride ions correlated positively with variables that degrade soils - EC, ESP, and SAR. We also found that in desertified areas, in addition to chloride, sulfate is also present in expressive levels, and due to the strong associations with calcium, magnesium, and sodium, our study suggests that in addition to the free forms of these ions, the forms of chlorides and sulfates of calcium, magnesium, and sodium also effectively contribute to the degradation of the areas. The combination of multivariate analysis × geochemistry × laboratory techniques was a valuable tool to identify and monitor saline levels in converting uncultivated to cultivated areas and from cultivated areas to desertified areas. MenosSoil salinization and sodification, caused by inadequate land management, is one of the main threats to the semiarid agroecosystems. It is essential to investigate saline levels under different land-use conditions to maintain the sustainability of agricultural production. The main objective of this study was to diagnose the salinity status of the soil in different land-use conditions in the semiarid region of Northeast Brazil. Soil samples were collected in the surface layer (0-5 cm) of three different land-use conditions: areas of low salinity (native vegetation - Caatinga), areas of different saline levels (cultivated areas), and areas of very high salinity (desertified by salinity), and compared regarding the chemical attributes of the soils by descriptive and multivariate analysis. The results showed that sodium and chloride were the predominant soluble ions in cultivated and desertified areas due to saline waters commonly used in the study region. Increases in electrical conductivity values of 1219 and 23207% were observed for cultivated and desertified areas, respectively, compared to areas of native vegetation. The principal component analysis contributed to identifying parameters responsible for the variation in soil salinity, and the second factor identified that percentage of exchangeable sodium, electrical conductivity, and exchangeable and soluble sodium plays an essential role in soil desertification. However, calcium, magnesium, sodium, and chloride ions correl... Mostrar Tudo |
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Thesagro: |
Deterioração do Solo; Gestão; Mudança Climática; Solo; Solo Salino; Solo Sódico. |
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Thesaurus NAL: |
Climate change; Saline soils; Sodic soils; Soil degradation; Soil management. |
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Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/doc/1145823/1/Assessment-of-soil-salinity-status-2022.pdf
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Marc: |
LEADER 03181naa a2200325 a 4500
001 2145823
005 2022-08-29
008 2022 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1016/j.ecolind.2022.109139$2DOI
100 1 $aPESSOA, L. G. M.
245 $aAssessment of soil salinity status under different land-use conditions in the semiarid region of Northeastern Brazil.$h[electronic resource]
260 $c2022
520 $aSoil salinization and sodification, caused by inadequate land management, is one of the main threats to the semiarid agroecosystems. It is essential to investigate saline levels under different land-use conditions to maintain the sustainability of agricultural production. The main objective of this study was to diagnose the salinity status of the soil in different land-use conditions in the semiarid region of Northeast Brazil. Soil samples were collected in the surface layer (0-5 cm) of three different land-use conditions: areas of low salinity (native vegetation - Caatinga), areas of different saline levels (cultivated areas), and areas of very high salinity (desertified by salinity), and compared regarding the chemical attributes of the soils by descriptive and multivariate analysis. The results showed that sodium and chloride were the predominant soluble ions in cultivated and desertified areas due to saline waters commonly used in the study region. Increases in electrical conductivity values of 1219 and 23207% were observed for cultivated and desertified areas, respectively, compared to areas of native vegetation. The principal component analysis contributed to identifying parameters responsible for the variation in soil salinity, and the second factor identified that percentage of exchangeable sodium, electrical conductivity, and exchangeable and soluble sodium plays an essential role in soil desertification. However, calcium, magnesium, sodium, and chloride ions correlated positively with variables that degrade soils - EC, ESP, and SAR. We also found that in desertified areas, in addition to chloride, sulfate is also present in expressive levels, and due to the strong associations with calcium, magnesium, and sodium, our study suggests that in addition to the free forms of these ions, the forms of chlorides and sulfates of calcium, magnesium, and sodium also effectively contribute to the degradation of the areas. The combination of multivariate analysis × geochemistry × laboratory techniques was a valuable tool to identify and monitor saline levels in converting uncultivated to cultivated areas and from cultivated areas to desertified areas.
650 $aClimate change
650 $aSaline soils
650 $aSodic soils
650 $aSoil degradation
650 $aSoil management
650 $aDeterioração do Solo
650 $aGestão
650 $aMudança Climática
650 $aSolo
650 $aSolo Salino
650 $aSolo Sódico
700 1 $aFREIRE, M. B. G. dos S.
700 1 $aGREEN, C. H. M.
700 1 $aMIRANDA, M. F. A.
700 1 $aARAUJO FILHO, J. C. de
700 1 $aPESSOA, W. R. L. S.
773 $tEcological Indicators$gv. 141, 109139, Aug. 2022.
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Registro original: |
Embrapa Solos (CNPS) |
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