xCO2 temporal variability above Brazilian agroecosystems: A remote sensing approach.

Autor: Morais Filho LFF; School of Agricultural and Veterinary Studies, São Paulo State University (FCAV-UNESP), Via de Acesso Prof. Paulo Donato Castellane S/n, 14884-900, Jaboticabal, São Paulo, Brazil. Electronic address: xfernandomorais@live.com., Meneses KC; School of Agricultural and Veterinary Studies, São Paulo State University (FCAV-UNESP), Via de Acesso Prof. Paulo Donato Castellane S/n, 14884-900, Jaboticabal, São Paulo, Brazil. Electronic address: kamila.meneses31@outlook.com., Santos GAA; School of Agricultural and Veterinary Studies, São Paulo State University (FCAV-UNESP), Via de Acesso Prof. Paulo Donato Castellane S/n, 14884-900, Jaboticabal, São Paulo, Brazil. Electronic address: gustavo_anndre@hotmail.com., Bicalho EDS; School of Agricultural and Veterinary Studies, São Paulo State University (FCAV-UNESP), Via de Acesso Prof. Paulo Donato Castellane S/n, 14884-900, Jaboticabal, São Paulo, Brazil. Electronic address: bicalho.elton@gmail.com., Rolim GS; School of Agricultural and Veterinary Studies, São Paulo State University (FCAV-UNESP), Via de Acesso Prof. Paulo Donato Castellane S/n, 14884-900, Jaboticabal, São Paulo, Brazil. Electronic address: glauco.rolim@unesp.br., La Scala N Jr; School of Agricultural and Veterinary Studies, São Paulo State University (FCAV-UNESP), Via de Acesso Prof. Paulo Donato Castellane S/n, 14884-900, Jaboticabal, São Paulo, Brazil. Electronic address: la.scala@unesp.br.
Jazyk: angličtina
Zdroj: Journal of environmental management [J Environ Manage] 2021 Jun 15; Vol. 288, pp. 112433. Date of Electronic Publication: 2021 Apr 07.
DOI: 10.1016/j.jenvman.2021.112433
Abstrakt: Agriculture and soil management practices are closely related to CO 2 emissions in crop fields. These practices directly interfere on the carbon dynamics between the land and atmosphere. In this study, we investigated the temporal variability of the column-averaged dry-air mole fraction of atmospheric CO 2 (xCO 2 ), solar-induced chlorophyll fluorescence (SIF), and the normalized difference vegetation index (NDVI) in areas with the main agroecosystems in southern-central Brazil as a way to understand if and how crops cycle and agricultural management could be associated with the temporal variability of NDVI, SIF and xCO 2 . The study was carried out in areas corresponding to the three agroecosystems': sugarcane (Pradópolis, State of São Paulo, Brazil), cropland with soybean-corn succession (Santo Antônio do Paraíso, State of Paraná, Brazil), and grassland (Águas Claras, State of Mato Grosso do Sul, Brazil). Air temperature, precipitation, NDVI, and SIF and xCO 2 were retrieved from NASA-POWER, NASA-GIOVANNI, SATVeg-EMBRAPA, and OCO-2, respectively, during a two-year study. Trends were removed from the NDVI, SIF, and xCO 2 time series applying the regression method. A negative correlation between SIF and xCO 2 was found in sugarcane and cropland areas, but in grasslands, no correlation showed up. Higher SIF values were observed in grassland (2.24 W m-2 sr-1 μm-1), and lower xCO 2 values were observed above grains, which varied from 396.8 to 404.2 ppm. Both xCO 2 and SIF followed more a seasonal pattern in sugarcane and annual crops, but over pasture this presented an unusual pattern related to higher precipitation events. Our results indicate a potential use of SIF and xCO 2 which could help identifying potential sources and sinks of the main additional greenhouse gas over agricultural areas.
(Copyright © 2021 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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