EGU2020-93
https://doi.org/10.5194/egusphere-egu2020-93
EGU General Assembly 2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Global maps of current and future nitrogen mineralization

Julia Maschler1, Daniel S. Maynard1, Devin Routh1, Johan van den Hoogen1, Zhaolei Li2, Shuli Niu2,3, and Thomas W. Crowther1
Julia Maschler et al.
  • 1ETH Zürich, Integrative Biology, Environmental Systems Science, Switzerland (julia.maschler@usys.ethz.ch)
  • 2Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China
  • 3College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, China

Soil nitrogen is a prominent determinant of plant growth, with nitrogen (N) availability being a key driver of terrestrial carbon sequestration. The local availability of soil N is thus crucial to our understanding of broad-scale trends in soil fertility, productivity, and carbon dynamics. Here, we provide global, high-resolution maps of current and future (2050) potential net nitrogen mineralization (N-min), revealing global patterns in soil N availability. Highest mineralization rates are found in warm and moist tropical regions, leading to a strong latitudinal gradient in N-min. We observed a positive correlation of N-min rates with human population density and net primary productivity. Projected climate conditions for 2050 suggest that N availability will further decrease in areas of low N availability and increase in areas of high N availability, thereby intensifying current global trends. These results shed light on the core processes governing productivity at a global scale, providing an opportunity to improve the accuracy of plant biomass and climate models.

How to cite: Maschler, J., Maynard, D. S., Routh, D., van den Hoogen, J., Li, Z., Niu, S., and Crowther, T. W.: Global maps of current and future nitrogen mineralization, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-93, https://doi.org/10.5194/egusphere-egu2020-93, 2019

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