Soil CO2, CH4 and N2O fluxes in urban forests, treed and open lawns in Angers, France

Author:

Künnemann Tom1,Cannavo Patrice1,Guérin Vincent2,Guénon René1

Affiliation:

1. Institut Agro, EPHOR

2. Univ.Angers, Institut Agro, INRAE, IRHS, SFR QUASAV

Abstract

Abstract Urban green spaces (UGSs) are mostly represented by lawns and forests. These UGSs can store carbon in soil and above-ground biomass, potentially modulated by management intensity and vegetation cover (shading, rainfall intercept, litterfall, …). Trees in lawns can create a local microclimate modifying soil biogeochemical cycles affecting in turn greenhouse gas (GHG) emissions. The objective of this study was to assess the effects of trees on microclimate (temperature and moisture) influencing GHG in contrasted UGS types. We monthly monitored (from March to November 2021) and compared soil CO2, CH4 and N2O fluxes simultaneously with surface temperature and moisture in treed lawns, open lawns and urban forests. Lawns included 4 different management intensities including mowing, irrigation and fertilization practices. Temperature was the best predictor of soil respiration in all UGS types studied and was the highest in open lawns. We showed that moisture reflected by the water filled pore space (WFPS) significantly added on variation explanation. The shading of trees strongly decreased soil respiration in treed lawns while soil properties were similar indicating a straightforward effect of lowering temperature. On the contrary, forests deeply changed soil properties as well as decreased soil temperature resulting in the lowest rates of soil respiration. Urban forests are a sink for CH4 throughout the year. Lawns were weak to mitigate CH4 and a source of CH4 in irrigated parks where WFPS overpassed 75%. N2O fluxes were weak probably reflecting the transition already made from mineral to organic fertilization limiting N availability.

Publisher

Research Square Platform LLC

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