Season and No-Till Rice Crop Intensification Affect Soil Microbial Populations Involved in CH4 and N2O Emissions

Dublin Core

Título

Season and No-Till Rice Crop Intensification Affect Soil Microbial Populations Involved in CH4 and N2O Emissions

Tema

SUELOS
CULTIVOS INTENSIVOS
METANO
EFECTO INVERNADERO
METANOGENESIS
ROTACION DE CULTIVOS
ROTACION DE SUELOS
MANEJO DEL SUELO
OXIDO NITROSO
MICROBIOS
BIBLIOGRAFIA NACIONAL QUIMICA
2022

Abstract

Rice is an important source of methane (CH4) and other crops may be sources of nitrous oxide (N2O), both of which are powerful greenhouse gases. In Uruguay, irrigated rice rotates with perennial pastures and allows high productivity and low environmental impact. A long-term experiment with contrasting rice rotation intensification alternatives, including rice–soybean and continuous rice, was recently carried out in an Argialboll located in a temperate region of South America. To know if rotation systems influence soil microbial activity involved in CH4 and N2O emissions, the abundance and potential rate for gas production or consumption of microbial populations were measured during the rice crop season. CH4 was only emitted when rice was flooded and N2O emission was not detected. All rotational soils showed the highest rate for methanogenesis at tillering (30 days after rice emergence), while for methanotrophy, the maximum rate was reached at flowering. The abundance of related genes also followed a seasonal pattern with highest densities of mcrA genes being observed at rice flowering whereas pmoA genes were more abundant in dry soils after rice harvest, regardless of the rotation system. Differences were foundmainly at tillering when soils with two consecutive summers under rice showed higher amounts ofmcrA and pmoA gene copies. The potential denitrification rate was highest at the tillering stage, but the abundance of nirK and nirS genes was highest in winter. Regarding ammoniumoxidation, bacterial amoA abundance was higher in winter while the archaeal amoA gene was similar throughout the year. A strong influence of the rice growth stage was registered for most of the parameters measured in rice paddy soils in this no-till rice intensification experiment. However, differences among rotations begin to be observed mainly at tillering when the abundance of populations of the methane and nitrous oxide cycles seemed to respond to the rice intensification.

Autor

Oreggioni, Daniela
Tarlera, Silvana
Terra, José A.
Irisarri, María del Pilar

Fuente

Frontiers in Soil Sciencev. 2, 2022. -- e832600

Fecha

2022

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Formato

PDF

Idioma

Inglés

Tipo

Artículo

Identificador

10.3389/fsoil.2022.832600

Document Item Type Metadata

Original Format

PDF
Fecha de agregación
June 1, 2022
Colección
Bibliografía Nacional Química
Tipo de Elemento
Document
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Citación
Fernández Scavino, Ana, “Season and No-Till Rice Crop Intensification Affect Soil Microbial Populations Involved in CH4 and N2O Emissions,” RIQUIM - Repositorio Institucional de la Facultad de Química - UdelaR, accessed August 11, 2022, http://riquim.fq.edu.uy/items/show/6517.
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