The Influence of Grain Legume and Tillage Strategies on CO 2 and N 2 O Gas Exchange under Varied Environmental Conditions

Emilie Marie Øst Hansen, Henrik Hauggaard-Nielsen, Eric Justes, Per Ambus and Teis Nørgaard Mikkelsen
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Emilie Marie Øst Hansen: Department of People and Technology, Roskilde University, DK-4000 Roskilde, Denmark
Henrik Hauggaard-Nielsen: Department of People and Technology, Roskilde University, DK-4000 Roskilde, Denmark
Eric Justes: CIRAD, Persyst Department, F-34398 Montpellier, France
Per Ambus: Department of Geosciences and Natural Resource Management, University of Copenhagen, DK-1350 Copenhagen, Denmark
Teis Nørgaard Mikkelsen: Department of Environmental Engineering, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark

Agriculture, 2021, vol. 11, issue 5, 1-18

Abstract: By this in vitro study addressing greenhouse gas (GHG) emissions from soil-plant mesocosms, we suggest a method to investigate the joint effects of environmental conditions, growth of plants, and agricultural soil management. Soils from two long-term agricultural trials in France were placed in climate chambers. The rotation trial was with or without grain legumes, and the tillage trial used plowing or reduced tillage. Environmental conditions consisted of two contrasting temperature regimes combined with ambient (400 ppm) or high (700 ppm) CO 2 concentrations in climate chambers. The plant growth went from seeding to vegetative growth. Carbon dioxide gas exchange measurements were conducted in both soil types for a period representing initial plant growth. The CO 2 exchange was influenced by the growing plants increasing the mesocosm respiration and gross ecosystem production. The environmental settings had no noticeable impact on the CO 2 exchange in the soils from the legume trial. The CO 2 exchange from the tillage trial soils exhibited variations induced by the environmental conditions depending on the tillage treatment. The N 2 O emission measurements in the legume trial soils showed little variability based on rotation, however, in soils with legumes, indications that higher temperatures will lead to more N 2 O emission were seen.

Keywords: net ecosystem exchange; gross ecosystem production; mesocosm; rotation; soil tillage (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2021
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