Gridded soil surface nitrogen surplus on grazing and agricultural land: Impact of land use maps

17264 7 94398 2 274820 document 94398 Kaltenegger_2021_Environ._Res._Commun._3_055003.pdf application/pdf 62885eb43e235c286a74746b5e7633aa MD5 1342677 2021-06-14 08:55:09 https://pure.iiasa.ac.at/id/eprint/17264/1/Kaltenegger_2021_Environ._Res._Commun._3_055003.pdf 17264 1 1 application/pdf text en public cc_by_4

Kaltenegger_2021_Environ._Res._Commun._3_055003.pdf

published 94399 1 274833 document 94399 indexcodes.txt text/x-c++ b52810ada43960130aaff213c82eb43c MD5 13617 2021-06-14 09:05:02 https://pure.iiasa.ac.at/id/eprint/17264/2/indexcodes.txt 17264 2 2 text/x-c++ other Generate index codes conversion from text to indexcodes en public

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http://eprints.org/relation/isVersionOf https://pure.iiasa.ac.at/id/document/94398 http://eprints.org/relation/isVolatileVersionOf https://pure.iiasa.ac.at/id/document/94398 http://eprints.org/relation/issmallThumbnailVersionOf https://pure.iiasa.ac.at/id/document/94398 archive 353 disk0/00/01/72/64 2021-06-14 08:57:37 2021-08-27 17:34:53 2021-06-14 08:57:37 article show 1 Kaltenegger K. 2212 0000-0001-7751-7794 Erb K.-H. Matej S. Winiwarter W. 1775 0000-0001-7131-1496 Gridded soil surface nitrogen surplus on grazing and agricultural land: Impact of land use maps pub ECE ECEPM Grazing; Land-use; Nitrogen; Nitrogen surplus; Nitrogen use efficiency Excess N application on agricultural land greatly impacts the environment in multiple ways, driven by population growth and improving quality of human diets. Therefore, it is essential to quantify the sources of the emissions of N compounds and their determinants (e.g. biological N fixation (BNF), mineral fertilizer, manure N and N deposition) to develop adequate mitigation measures. Here we aim at comprehensively mapping and quantifying N fluxes on agricultural land to analyze these sources on different scales. As underlying grazing land maps used for such calculations are fairly different in terms of methodology and definition and thus spatial extent and pattern, we investigate how this diversity in grazing land maps affects quantification of N indicators. We compared three different global grazing land maps and analyzed the propagation of differences to discrepancies in N indicators calculated from them. We discovered that (i) area differences propagated to high discrepancies in N surplus mostly in Asia, and to a minor extent also in Europe and Northern Africa. (ii) BNF constitutes an important translator for differences on grazing land to N indicators, while also being a source of further uncertainty, which warrants further scrutiny. (iii) A more inclusive definition of grazing land results in overall less N surplus given the larger areas included but allows to provide a more comprehensive estimate of the influence of human activity on the N cycle. This study is the first to provide an in-depth analysis of the effect of grazing land and agricultural land area differences on various N budget terms and N indicator calculation, highlighting opportunities for further research, and the importance of a comprehensive accounting of N surplus when using an inclusive definition of grazing land. 2021-05-10 published Institute of Physics Publishing (IOP) 10.1088/2515-7620/abedd8 3033 335 public Environmental Research Communications 3 5 e055003 TRUE 2515-7620 FALSE no info:eu-repo/semantics/article