Variabilidade temporal da emissão de CO2 e do influxo de O2 no solo em diferentes tipos de cobertura
Carregando...
Arquivos
Data
2020-07-29
Autores
Lucena, Wanderson Benerval de
Título da Revista
ISSN da Revista
Título de Volume
Editor
Universidade Estadual Paulista (Unesp)
Resumo
O sistema solo-planta-microrganismos-atmosfera possui uma dinâmica complexa. Apesar dos esforços, ainda não se sabe de maneira clara a relação de emissão de CO2 do solo e outros gases de efeito estufa a partir do influxo de O2 no sistema solo. Outra dificultadade é a quantidade de estudos que expliquem a dinâmica de gases do solo, considerando absorção de O2. A proposta foi investigar os padrões temporais de emissão de CO2 (FCO2) em função da captura de O2 no solo (FO2), da umidade (Usolo) e temperatura do solo (Tsolo) e suas relações com a cobertura do solo e as condições climáticas locais. Durante um período de 62 dias, em 2019, foram avaliados o FCO2, FO2, umidade e temperatura do solo, além dos dados meteorológicos. Observou-se correlação linear positiva entre a emissão de CO2 e a captura de O2 do solo. Essas correlações aconteceram em áreas de cobertura morta e vegetal, respectivamente, r= 0,45 (p<0,05) e r=0,44 (p<0,05). A análise de variância da variabilidade temporal foi significativa. Demostrando que os fatores tempo e cobertura interferem na dinâmica da FCO2 (F=2,1379; p<0,0001), FO2 (F= 1,9124; p=0,003), Usolo (F=5,30; p<0,0001), Tsolo (F=10,51; p<0,0001). Conclui-se que a variabilidade temporal da emissão de CO2 e captura de O2 do solo está associada as condições de cobertura, umidade do solo e atmosféricas da região. A cobertura do solo proporciona controle térmico e a manutenção da umidade do solo. No tempo, essa condição de umidade favorecida pela cobertura do solo e foi controladora dos processos de emissão de CO2 e captura de O2 no solo.
The soil-plant-microorganisms-atmosphere system has a complex dynamic. Despite efforts, the relationship between CO2 emission from soil and other greenhouse gases from the influx of O2 into the soil system is not yet clearly known. Another difficulty is the number of studies that explain the dynamics of soil gases, considering O2 absorption. The proposal was to investigate the temporal patterns of CO2 emission (FCO2) as a function of soil O2 capture (FO2), soil moisture (Usolo) and temperature (Tsolo) and their relationship with soil cover and climatic conditions locations. Over a period of 62 days in 2019. FCO2, FO2, soil moisture and temperature were evaluated, in addition to meteorological data. A positive linear correlation was observed between CO2 emission and O2 uptake from the soil. These correlations occurred in areas of mulch and vegetation, respectively, r = 0.45 (p <0.05) and r = 0.44 (p <0.05). The analysis of variance of temporal variability was significant. Demonstrating that the time and coverage factors interfere in the dynamics of FCO2 (F = 2.1379; p <0.0001), FO2 (F = 1.9124; p = 0.003), Usolo (F = 5.30; p <0,0001), Tsolo (F = 10.51; p <0.0001). Based on the results, it’s concluded. The temporal variability of CO2 emissions and O2 uptake from the soil is associated with the region's coverage, soil moisture and atmospheric conditions. The soil cover provided thermal control and the maintenance of soil moisture. Over time, this moisture condition favored by the soil cover and was the controller of the processes of CO2 emission and capture of O2 from the soil.
The soil-plant-microorganisms-atmosphere system has a complex dynamic. Despite efforts, the relationship between CO2 emission from soil and other greenhouse gases from the influx of O2 into the soil system is not yet clearly known. Another difficulty is the number of studies that explain the dynamics of soil gases, considering O2 absorption. The proposal was to investigate the temporal patterns of CO2 emission (FCO2) as a function of soil O2 capture (FO2), soil moisture (Usolo) and temperature (Tsolo) and their relationship with soil cover and climatic conditions locations. Over a period of 62 days in 2019. FCO2, FO2, soil moisture and temperature were evaluated, in addition to meteorological data. A positive linear correlation was observed between CO2 emission and O2 uptake from the soil. These correlations occurred in areas of mulch and vegetation, respectively, r = 0.45 (p <0.05) and r = 0.44 (p <0.05). The analysis of variance of temporal variability was significant. Demonstrating that the time and coverage factors interfere in the dynamics of FCO2 (F = 2.1379; p <0.0001), FO2 (F = 1.9124; p = 0.003), Usolo (F = 5.30; p <0,0001), Tsolo (F = 10.51; p <0.0001). Based on the results, it’s concluded. The temporal variability of CO2 emissions and O2 uptake from the soil is associated with the region's coverage, soil moisture and atmospheric conditions. The soil cover provided thermal control and the maintenance of soil moisture. Over time, this moisture condition favored by the soil cover and was the controller of the processes of CO2 emission and capture of O2 from the soil.
Descrição
Palavras-chave
Respiração do solo, Relação solo-atmosfera, Solo nu