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Agronomy 2019, 9(3), 124; https://doi.org/10.3390/agronomy9030124

Grassland Management Influences the Response of Soil Respiration to Drought

1
Manaaki Whenua–Landcare Research, PO Box 69040, Lincoln 7640, New Zealand
2
Department of Biology, University of British Columbia–Okanagan, Kelowna, BC V1V 1V7, Canada
3
The French National Center for Scientific Research (CNRS), Institut d’Ecologie et des Sciences de l’Environnement Paris (IEES), UMR 7618, Batiment EGER, Aile B, F-78850 Thiverval Grignon, France
4
AgroParisTech, French Natl Inst Agr Res INRA, UMR ECOSYS, F-78850 Thiverval Grignon, France
5
National Institute of Agricultural Research (INRA), Centre de recherché, Nouvelle-Aquitaine-Poitiers, URP3F, 86600 Lusignan, France
*
Author to whom correspondence should be addressed.
Received: 24 February 2019 / Accepted: 3 March 2019 / Published: 7 March 2019
(This article belongs to the Special Issue Grassland Management for Sustainable Agroecosystems)
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PDF [3346 KB, uploaded 7 March 2019]
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Abstract

Increasing soil carbon stocks in agricultural grasslands has a strong potential to mitigate climate change. However, large uncertainties around the drivers of soil respiration hinder our ability to identify management practices that enhance soil carbon sequestration. In a context where more intense and prolonged droughts are predicted in many regions, it is critical to understand how different management practices will temper drought-induced carbon losses through soil respiration. In this study, we compared the impact of changing soil volumetric water content during a drought on soil respiration in permanent grasslands managed either as grazed by dairy cows or as a mowing regime. Across treatments, root biomass explained 43% of the variability in soil respiration (p < 0.0001). Moreover, analysis of the isotopic composition of CO2 emitted from the soil, roots, and root-free soil suggested that the autotrophic component largely dominated soil respiration. Soil respiration was positively correlated with soil water content (p = 0.03) only for the grazed treatment. Our results suggest that the effect of soil water content on soil respiration was attributable mainly to an effect on root and rhizosphere activity in the grazed treatment. We conclude that farm management practices can alter the relationship between soil respiration and soil water content. View Full-Text
Keywords: soil respiration; soil volumetric water content; stable carbon isotopes; grassland; management practices soil respiration; soil volumetric water content; stable carbon isotopes; grassland; management practices
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Moinet, G.Y.K.; Midwood, A.J.; Hunt, J.E.; Rumpel, C.; Millard, P.; Chabbi, A. Grassland Management Influences the Response of Soil Respiration to Drought. Agronomy 2019, 9, 124.

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