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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Differences in N2O Fluxes and Denitrification Gene Abundance in the Wet and Dry Seasons Through Soil and Plant Residue Characteristics of Tropical Tree Crops

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Autor(es):
Nishisaka, Caroline Sayuri [1] ; Youngerman, Connor [2] ; Meredith, Laura K. [2] ; do Carmo, Janaina Braga [1, 3] ; Navarrete, Acacio Aparecido [1, 3]
Número total de Autores: 5
Afiliação do(s) autor(es):
[1] Univ Fed Sao Carlos, Grad Program Biotechnol & Environm Monitoring PPG, Sorocaba - Brazil
[2] Univ Arizona, Sch Nat Resources & Environm, Tucson, AZ - USA
[3] Univ Fed Sao Carlos, Dept Environm Sci, Sorocaba - Brazil
Número total de Afiliações: 3
Tipo de documento: Artigo de Revisão
Fonte: FRONTIERS IN ENVIRONMENTAL SCIENCE; v. 7, FEB 5 2019.
Citações Web of Science: 0
Resumo

The conversion of forest to agricultural soils is a widespread activity in tropical systems, and its link to nitrous oxide (N2O) fluxes and nitrogen cycling gene abundance is relevant to understand environmental drivers that may interact with climate change. A current challenge to estimating N2O emissions from land use conversion is an incomplete understanding of crop-specific impacts on denitrifier communities and the N2O fluxes driven by differences in the above-and below-ground inputs with crop type. To address this knowledge gap in tree crops, we evaluated N2O fluxes and denitrification gene abundance and their relationships with soil and plant residue characteristics in citrus and eucalyptus plantations in the field and in soil incubations. We found that the accumulated N2O fluxes from soil were lower for the two agricultural field sites than those for their adjacent forest sites in dry and wet seasons. The N2O fluxes were higher in the wet season, and this seasonal difference persisted even when the soils collected from both seasons were incubated under the same moisture and temperature conditions in the lab for 30 days. Increased N2O fluxes in the wet season were accompanied by an increase in soil nirK and nosZ gene abundance, the dissolved organic carbon (DOC) concentration, and the total soil carbon (C) and nitrogen (N) content. In turn, the abundance of denitrifiers, as indicated by nirK, nirS, and nosZ gene copy numbers, showed a low but significant positive correlation with soil bulk density. Our results suggest that soil moisture, leaf litter, and crop residues influence the seasonal differences in both N2O fluxes and abundance of denitrifiers in citrus-and eucalyptus-cultivated soils, likely through effects on soil physicochemical characteristics. These findings highlight the overwhelming role of environmental drivers that can make investigating microbial drivers difficult in the field and open the possibility for a better understanding of N cycling processes in tropical soils based on paired field-and incubation-based experimentation. (AU)

Processo FAPESP: 17/17441-0 - Vinculando fatores físico-químicos do solo e genes desnitrificantes microbianos aos fluxos de óxido nitroso em áreas florestais afetadas com Eucalyptus e Citrus no Sudeste do Brasil
Beneficiário:Caroline Sayuri Nishisaka
Linha de fomento: Bolsas no Exterior - Estágio de Pesquisa - Mestrado
Processo FAPESP: 12/50694-6 - Emissão de gases do efeito estufa durante o manejo da vinhaça e da palha em áreas cultivadas com cana de açúcar: ampliação da infraestrutura analítica
Beneficiário:Janaina Braga Do Carmo
Linha de fomento: Auxílio à Pesquisa - Regular
Processo FAPESP: 16/16687-3 - Dinâmica da produção e consumo de metano pela microbiota ativa em áreas inundáveis da Amazônia
Beneficiário:Acacio Aparecido Navarrete
Linha de fomento: Auxílio à Pesquisa - Programa de Pesquisa sobre Mudanças Climáticas Globais - Jovens Pesquisadores
Processo FAPESP: 16/15289-4 - Impactos da mudança do uso e cobertura do solo na emissão de óxido nitroso e na abundância de bactérias desnitrificantes no solo
Beneficiário:Caroline Sayuri Nishisaka
Linha de fomento: Bolsas no Brasil - Mestrado