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  Global patterns of nitrogen limitation: confronting two global biogeochemical models with observations

Thomas, R., Zaehle, S., Templer, P., & Goodale, C. (2013). Global patterns of nitrogen limitation: confronting two global biogeochemical models with observations. Global Change Biology, 19(10), 2986-2998. doi:10.1111/gcb.12281.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-ADFA-9 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0019-8A60-4
Genre: Journal Article

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Thomas, R.Q., Author
Zaehle, Sönke1, 2, Author              
Templer, P.H., Author
Goodale, C.L, Author
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1Terrestrial Biosphere Modelling & Data assimilation, Dr. S. Zähle, Department Biogeochemical Systems, Prof. M. Heimann, Max Planck Institute for Biogeochemistry, Max Planck Society, ou_1497787              
2Terrestrial Biosphere Modelling , Dr. Sönke Zähle, Department Biogeochemical Integration, Dr. M. Reichstein, Max Planck Institute for Biogeochemistry, Max Planck Society, ou_1938309              

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 Abstract: Projections of future changes in land carbon (C) storage using biogeochemical models depend on accurately modeling the interactions between the C and nitrogen (N) cycles. Here, we present a framework for analyzing N limitation in global biogeochemical models to explore how C-N interactions of current models compare to field observations, identify the processes causing model divergence, and identify future observation and experiment needs. We used a set of N-fertilization simulations from two global biogeochemical models (CLM-CN and O-CN) that use different approaches to modeling C-N interactions. On the global scale, net primary productivity (NPP) in the CLM-CN model was substantially more responsive to N fertilization than in the O-CN model. The most striking difference between the two models occurred for humid tropical forests, where the CLM-CN simulated a 62% increase in NPP at high N addition levels (30 g N m 2 yr 1), while the O-CN predicted a 2% decrease in NPP due to N fertilization increasing plant respiration more than photosynthesis. Across 35 temperate and boreal forest sites with field N-fertilization experiments, we show that the CLM-CN simulated a 46% increase in aboveground NPP in response to N, which exceeded the observed increase of 25%. In contrast, the O-CN only simulated a 6% increase in aboveground NPP at the N-fertilization sites. Despite the small response of NPP to N fertilization, the O-CN model accurately simulated ecosystem retention of N and the fate of added N to vegetation when compared to empirical 15N tracer application studies. In contrast, the CLM-CN predicted lower total ecosystem N retention and partitioned more losses to volatilization than estimated from observed N budgets of small catchments. These results point to the need for model improvements in both models in order to enhance the accuracy with which global C-N cycle feedbacks are simulated

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 Dates: 20132013-08-08
 Publication Status: Published online
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 Identifiers: Other: BGC1821
DOI: 10.1111/gcb.12281
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Title: Global Change Biology
Source Genre: Journal
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Publ. Info: Oxford, UK : Blackwell Science
Pages: - Volume / Issue: 19 (10) Sequence Number: - Start / End Page: 2986 - 2998 Identifier: ISSN: 1354-1013
CoNE: https://pure.mpg.de/cone/journals/resource/954925618107