Combined effect of nitrogen fertiliser and leaf litter carbon drive nitrous oxide emissions in tropical soils
- PDF / 658,582 Bytes
- 16 Pages / 547.087 x 737.008 pts Page_size
- 33 Downloads / 211 Views
(0123456789().,-volV) ( 01234567 89().,-volV)
ORIGINAL ARTICLE
Combined effect of nitrogen fertiliser and leaf litter carbon drive nitrous oxide emissions in tropical soils Hemant Raj Pandeya Constancio Tony Asis Mila Bristow . Peter R.
. Johannes Friedl . Daniele De Rosa . . Joanne Tilbrook . Clemens Scheer . Grace . David W. Rowlings
Received: 10 March 2020 / Accepted: 14 September 2020 / Published online: 23 September 2020 Ó Springer Nature B.V. 2020
Abstract Intensification of agriculture in the tropics is likely to increase reactive nitrogen (N) losses in the form of nitrous oxide (N2O), however, drivers of emissions from tropical soils remain poorly understood. This study investigated the effect of leaf litter and urea fertiliser on N2O emissions from two Australian tropical mango orchards. Treatments included urea (25 g N m-2), leaf litter (1500 g m-2 dry matter), their combined application, and untreated control. Up to 80.5 ± 8.4 mg N2O-N m-2 were lost
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10705-020-10094-6) contains supplementary material, which is available to authorized users. H. R. Pandeya J. Friedl D. De Rosa C. Scheer P. R. Grace D. W. Rowlings (&) Institute for Future Environments, Queensland University of Technology, Brisbane, QLD 4000, Australia e-mail: [email protected] C. T. Asis J. Tilbrook M. Bristow Northern Territory Department of Primary Industry and Resources, Northern Territory Government, Darwin 0828, Australia C. Scheer Institute for Meteorology and Climate Research, Karlsruhe Institute of Technology, GarmischPartenkirchen, 82467 Bavaria, Germany M. Bristow AgriFutures Australia, Locked Bag 588, Wagga Wagga, NSW 2650, Australia
within two weeks of treatment application, accounting for more than 60% of annual N2O emissions. Indirect emissions [ 30 mg m-2 d-1 were recorded at one site, potentially resulting from groundwater transported N. Highest annual N2O emissions were observed from Litter ? Urea with 130.4 mg N2O-N m-2 y-1, exceeding those from Urea-Only by a factor of two and those from Litter-Only by a factor of four. This resulted in residue and fertiliser emission factors (EF) of \ 0.01–0.37%, well below the IPCC and Tier 2 defaults, with whole orchard losses equivalent to 0.19–0.66 kg N2O-N ha-1. The findings suggest N2O is N limited when no N fertiliser is applied, even when applying large amounts of litter-N, and by carbon (C) in the absence of litter. The combined effect of Litter ? Urea on N2O emissions surpassed the effect of the sole application of litter and urea, demonstrating a critical interaction between both substrates. This interaction effect needs to be considered when developing management strategies aimed at increasing soil C in tropical soils. Keywords Nitrous oxide (N2O) Leaf litter/ residues Mango Fruit tree crops/orchard Emission factor Tropical savannah Abbreviations C/N Carbon/Nitrogen CEC Cation exchange capacity DOC Dissolved organic carbon
123
208
DON EF GHG N 2O
Data Loading...
