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Registro Completo |
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Biblioteca(s): |
Embrapa Solos. |
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Data corrente: |
04/01/2021 |
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Data da última atualização: |
18/02/2021 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
NEVES, L. V. de M. W.; FRACETTO, F. J. C.; FRACETTO, G. G. M.; ARAUJO FILHO, J. C. de; ARAUJO, J. K. S.; SANTOS, J. C. B. dos; MENDES JÚNIOR, J. P.; SOUZA JÚNIOR, V. D. de. |
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Afiliação: |
LAÉRCIO VIEIRA DE MELO WANDERLEY NEVES, UFRPE; FELIPE JOSÉ CURY FRACETTO, UFRPE; GISELLE GOMES MONTEIRO FRACETTO, UFRPE; JOSE COELHO DE ARAUJO FILHO, CNPS; JANE KELLY SILVA ARAUJO, UFRPE; JEAN CHEYSON BARROS DOS SANTOS, UFRPE; JOSÉ PETRÔNIO MENDES JÚNIOR, UFRPE; VALDOMIRO SEVERINO DE SOUZA JÚNIOR, UFRPE. |
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Título: |
Microbial abundance and C and N stocks in tropical degraded Planosols from semiarid northeastern Brazil. |
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Ano de publicação: |
2021 |
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Fonte/Imprenta: |
Catena, v. 196, 104931, Jan. 2021. |
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DOI: |
https://doi.org/10.1016/j.catena.2020.104931 |
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Idioma: |
Inglês |
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Conteúdo: |
Improper management and exploitation of the natural resources of the semiarid Planosols have triggered irreparable degradation processes in which vegetation can no longer reestablish itself naturally. We investigated preserved and degraded Planosols from Pernambuco State, Brazil, to determine total C and N stocks and quantify the functional and total microorganisms. We hypothesized that the degraded Planosol would have: i-significant reductions in C and N stocks, microbial biomass and activity in relation to the soil with preserved vegetation; ii-significant decreases in the proportion of total diazotrophic bacteria and archaea, ammonia-oxidizing bacteria, iron-reducing and -oxidizing bacteria and in alkaline phosphatase producers along the pedogenetic horizons. Thus, microbial biomass, soil basal respiration and metabolic and microbial quotients were obtained. Furthermore, total and functional gene copies were quantified by quantitative polymerase chain reaction (qPCR), and the functionality of biological nitrogen fixation (BNF) was determined using an acetylene reduction assay. In degraded Planosols, the activity from the present diazotrophs has been responsible for maintaining soil N stocks (i.e. soil N stocks without significant differences between the evaluated Planosols), but the soil C stocks were halved. Biomass and microbial activity did not show significant differences between two Planosols and there was no apparent metabolic stress from the identified microbiota. We found a significant proportion of structural and functional microorganisms in both Planosols. There were many archaea predominating in the Bt pedogenetic horizon in both Planosols, and a high proportion of microorganismal alkaline phosphatase was also found. We highlight the need for studies on BNF efficiency, especially focusing on archaea and free-living bacteria, as they are performing this important biological function, even in totally degraded semiarid soils. MenosImproper management and exploitation of the natural resources of the semiarid Planosols have triggered irreparable degradation processes in which vegetation can no longer reestablish itself naturally. We investigated preserved and degraded Planosols from Pernambuco State, Brazil, to determine total C and N stocks and quantify the functional and total microorganisms. We hypothesized that the degraded Planosol would have: i-significant reductions in C and N stocks, microbial biomass and activity in relation to the soil with preserved vegetation; ii-significant decreases in the proportion of total diazotrophic bacteria and archaea, ammonia-oxidizing bacteria, iron-reducing and -oxidizing bacteria and in alkaline phosphatase producers along the pedogenetic horizons. Thus, microbial biomass, soil basal respiration and metabolic and microbial quotients were obtained. Furthermore, total and functional gene copies were quantified by quantitative polymerase chain reaction (qPCR), and the functionality of biological nitrogen fixation (BNF) was determined using an acetylene reduction assay. In degraded Planosols, the activity from the present diazotrophs has been responsible for maintaining soil N stocks (i.e. soil N stocks without significant differences between the evaluated Planosols), but the soil C stocks were halved. Biomass and microbial activity did not show significant differences between two Planosols and there was no apparent metabolic stress from the identified microbiota. ... Mostrar Tudo |
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Palavras-Chave: |
Genes Funcionais. |
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Thesagro: |
Biomassa; Horizonte; Solo. |
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Thesaurus Nal: |
Archaea; Microbial biomass; Soil horizons. |
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Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
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Marc: |
LEADER 02879naa a2200301 a 4500
001 2128963
005 2021-02-18
008 2021 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1016/j.catena.2020.104931$2DOI
100 1 $aNEVES, L. V. de M. W.
245 $aMicrobial abundance and C and N stocks in tropical degraded Planosols from semiarid northeastern Brazil.$h[electronic resource]
260 $c2021
520 $aImproper management and exploitation of the natural resources of the semiarid Planosols have triggered irreparable degradation processes in which vegetation can no longer reestablish itself naturally. We investigated preserved and degraded Planosols from Pernambuco State, Brazil, to determine total C and N stocks and quantify the functional and total microorganisms. We hypothesized that the degraded Planosol would have: i-significant reductions in C and N stocks, microbial biomass and activity in relation to the soil with preserved vegetation; ii-significant decreases in the proportion of total diazotrophic bacteria and archaea, ammonia-oxidizing bacteria, iron-reducing and -oxidizing bacteria and in alkaline phosphatase producers along the pedogenetic horizons. Thus, microbial biomass, soil basal respiration and metabolic and microbial quotients were obtained. Furthermore, total and functional gene copies were quantified by quantitative polymerase chain reaction (qPCR), and the functionality of biological nitrogen fixation (BNF) was determined using an acetylene reduction assay. In degraded Planosols, the activity from the present diazotrophs has been responsible for maintaining soil N stocks (i.e. soil N stocks without significant differences between the evaluated Planosols), but the soil C stocks were halved. Biomass and microbial activity did not show significant differences between two Planosols and there was no apparent metabolic stress from the identified microbiota. We found a significant proportion of structural and functional microorganisms in both Planosols. There were many archaea predominating in the Bt pedogenetic horizon in both Planosols, and a high proportion of microorganismal alkaline phosphatase was also found. We highlight the need for studies on BNF efficiency, especially focusing on archaea and free-living bacteria, as they are performing this important biological function, even in totally degraded semiarid soils.
650 $aArchaea
650 $aMicrobial biomass
650 $aSoil horizons
650 $aBiomassa
650 $aHorizonte
650 $aSolo
653 $aGenes Funcionais
700 1 $aFRACETTO, F. J. C.
700 1 $aFRACETTO, G. G. M.
700 1 $aARAUJO FILHO, J. C. de
700 1 $aARAUJO, J. K. S.
700 1 $aSANTOS, J. C. B. dos
700 1 $aMENDES JÚNIOR, J. P.
700 1 $aSOUZA JÚNIOR, V. D. de
773 $tCatena$gv. 196, 104931, Jan. 2021.
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