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Climate 2015, 3(3), 689-696; doi:10.3390/cli3030689

Soil Water Potential Control of the Relationship between Moisture and Greenhouse Gas Fluxes in Corn-Soybean Field

Department of Agriculture and Environmental Sciences, Lincoln University, Jefferson City, MO 65102-0029, USA
Institut Facultaire des Sciences Agronomiques (IFA) de Yangambi, BP 28 Yangambi, Republique Democratique du Congo
Author to whom correspondence should be addressed.
Academic Editors: Nir Y. Krakauer, Tarendra Lakhankar, Soni M. Pradhanang, Vishnu Pandey and Madan Lall Shrestha
Received: 11 March 2015 / Accepted: 11 August 2015 / Published: 19 August 2015
(This article belongs to the Special Issue Climate Change and Development in South Asia)
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Soil water potential (Ψ) controls the dynamics of water in soils and can therefore affect greenhouse gas fluxes. We examined the relationship between soil moisture content (θ) at five different levels of water potential (Ψ = 0, −0.05, −0.1, −0.33 and −15 bar) and greenhouse gas (carbon dioxide, CO2; nitrous oxide, N2O and methane, CH4) fluxes. The study was conducted in 2011 in a silt loam soil at Freeman farm of Lincoln University. Soil samples were collected at two depths: 0–10 and 10–20 cm and their bulk densities were measured. Samples were later saturated then brought into a pressure plate for measurements of Ψ and θ. Soil air samples for greenhouse gas flux analyses were collected using static and vented chambers, 30 cm in height and 20 cm in diameter. Determination of CO2, CH4 and N2O concentrations from soil air samples were done using a Shimadzu Gas Chromatograph (GC-14). Results showed that there were significant correlations between greenhouse gas fluxes and θ held at various Ψ in the 0–10 cm depth of soil group. For instance, θ at Ψ = 0 positively correlated with measured CO2 (p = 0.0043, r = 0.49), N2O (p = 0.0020, r = 0.64) and negatively correlated with CH4 (p = 0.0125, r = −0.44) fluxes. Regression analysis showed that 24%, 41% and 19% of changes in CO2, N2O and CH4 fluxes, respectively, were due to θ at Ψ = 0 (p < 0.05). This study stresses the need to monitor soil water potential when monitoring greenhouse gas fluxes. View Full-Text
Keywords: soil water potential; soil moisture; greenhouse gas fluxes; corn; soybean soil water potential; soil moisture; greenhouse gas fluxes; corn; soybean

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Panday, D.; Nkongolo, N.V. Soil Water Potential Control of the Relationship between Moisture and Greenhouse Gas Fluxes in Corn-Soybean Field. Climate 2015, 3, 689-696.

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