Multiscale spatial variability of CO2 emissions and correlations with physico-chemical soil properties |
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Authors: | Suzanne E. Allaire Sébastien F. Lange Jonathan A. Lafond Bernard Pelletier Athyna N. Cambouris Pierre Dutilleul |
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Affiliation: | 1. Horticultural Research Center, Université Laval, 2480 Hochelaga, G1V 0A6, Québec, QC, Canada;2. Water, earth and environment center, National Institute of Scientific Research, Université du Québec, 490 de la Couronne, G1K 9A9, Québec, QC, Canada;3. Department of Natural Resource Sciences, McGill University, McDonald Campus, H9X 3V9, Ste-Anne-de-Bellevue, QC, Canada;4. Pedology and Agricultural Precision laboratories, Agriculture and Agri-Food Canada, 979 Ave de Bourgogne, G1W 2L4, Québec, QC, Canada;5. Department of Plant Science, McGill University, Macdonald Campus, H9X 3V9, Ste-Anne-de-Bellevue, QC, Canada |
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Abstract: | Spatial variability of greenhouse gas (GHG) emissions from agricultural lands is not well known although it has a great impact on the accuracy of GHG budget.The objectives of this study were to assess the spatial variability of CO2 emission fluxes (CO2-flux) and correlate these emissions with soil physico-chemical properties at two spatial scales and at different depths using a new geostatistical approach (coregionalization analysis with a drift, CRAD) that performs multiscale spatial analysis.Two agricultural sites with sandy and loamy soils were instrumented at 108 geo-referred sampling points and at two depths during spring 2007 where soil surface CO2-flux and soil physico-chemical parameters were measured. The CO2-flux presented spatial patterns characterized by different scales (i.e., non-spatial, small spatial and large spatial scale components), each describing a different fraction of its variability. About a quarter of CO2-flux variability at the first site and one fifth at the other site was attributed to the non-spatial component. Strongest correlations were obtained between CO2-flux and soil temperature, water saturation (Sw), elevation, electrical conductivity, soil bulk density, and the C/N ratio, but with differences between sites. Correlations were much stronger at large scale. Analyzing correlations between CO2-flux and soil properties without discriminating for scales can miss important scale-dependent processes controlling soil gas emissions. Scales at which these processes vary should therefore be taken into account. |
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