EGU21-2553, updated on 03 Mar 2021
https://doi.org/10.5194/egusphere-egu21-2553
EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Soil N2O emissions from temperate cropland agroforestry and monoculture systems

Guodong Shao, Guntars Martinson, Jie Luo, Xenia Bischel, Dan Niu, Marife D. Corre, and Edzo Veldkamp
Guodong Shao et al.
  • Soil Science of Tropical and Subtropical Ecosystems, Faculty of Forest Sciences and Forest Ecology, University of Goettingen, Buesgenweg 2, Goettingen, Germany (sguadon@gwdg.de)

Monoculture cropland is a major contributor to agriculture-related sources of N2O emission, a potent greenhouse gas and an agent of ozone depletion. Cropland agroforestry has the potential to minimize deleterious environmental impacts. Presently, there is no systematic comparison of soil N2O emission between cropland agroforestry (CAF) and monoculture systems (MC) in Western Europe. Our study aimed to (1) quantify the spatial-temporal dynamics of soil N2O fluxes, and (2) determine their soil controlling factors in CAF and MC. We selected three sites with different soil types (Phaeozem, Cambisol, and Arenosol) in Germany. Each site has paired CAF and MC (agroforestry sites consisted of 12-m wide tree row and 48-m wide crop row and were established in 2007, 2008 and 2019 in these soil types, respectively). In each management system at each site, we had four replicate plots. In the CAF, we conducted measurements in the tree row and within the crop row at 1 m, 7 m, and 24 m from the tree row. We measured soil N2O fluxes monthly over 2 years (March 2018‒February 2020) using static vented chambers method. Following gas sampling, we also measured soil temperature, water-filled pore space (WFPS), and mineral N (NH4+ and NO3-) within the same day. Across all sites, soil moisture and N availability were major drivers of soil N2O fluxes. Both CAF and MC were net sources of soil N2O at all sites. At the site with Phaeozem soil, annual soil N2O emissions from CAF in both years (1.84 ± 0.35 and 1.17 ± 0.30 kg N ha1 yr1) were greater than MC (0.89 ± 0.09 and 0.34 ± 0.05 kg N ha1 yr1) (P = 0.03). At the site with Cambisol soil, annual soil N2O emission did not differ between MC (0.49 ± 0.07 kg N ha1 yr1) and CAF (0.73 ± 0.13 kg N ha1 yr1) in 2018/2019 (P = 0.20) whereas in 2019/2020 MC was 134% greater than CAF (2.92 ± 0.45 and 1.25 ± 0.08 kg N ha1 yr1, respectively; P = 0.03). The inter-annual differences were largely related to crop types and to climate conditions. At the site with Arenosol soil, there was no difference between CAF and MC. Our results indicated that CAF may decrease, maintain and/or increase soil N2O emissions compared to MC depending on tree age, soil characteristics, management and precipitation.

How to cite: Shao, G., Martinson, G., Luo, J., Bischel, X., Niu, D., D. Corre, M., and Veldkamp, E.: Soil N2O emissions from temperate cropland agroforestry and monoculture systems, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-2553, https://doi.org/10.5194/egusphere-egu21-2553, 2021.

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