Simulated effects of nitrogen saturation the global carbon budget using the IBIS model

Scientific Reports
By: , and 

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Abstract

Over the past 100 years, human activity has greatly changed the rate of atmospheric N (nitrogen) deposition in terrestrial ecosystems, resulting in N saturation in some regions of the world. The contribution of N saturation to the global carbon budget remains uncertain due to the complicated nature of C-N (carbon-nitrogen) interactions and diverse geography. Although N deposition is included in most terrestrial ecosystem models, the effect of N saturation is frequently overlooked. In this study, the IBIS (Integrated BIosphere Simulator) was used to simulate the global-scale effects of N saturation during the period 1961–2009. The results of this model indicate that N saturation reduced global NPP (Net Primary Productivity) and NEP (Net Ecosystem Productivity) by 0.26 and 0.03 Pg C yr−1, respectively. The negative effects of N saturation on carbon sequestration occurred primarily in temperate forests and grasslands. In response to elevated CO2 levels, global N turnover slowed due to increased biomass growth, resulting in a decline in soil mineral N. These changes in N cycling reduced the impact of N saturation on the global carbon budget. However, elevated N deposition in certain regions may further alter N saturation and C-N coupling.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Simulated effects of nitrogen saturation the global carbon budget using the IBIS model
Series title Scientific Reports
DOI 10.1038/srep39173
Volume 6
Year Published 2016
Language English
Publisher Springer Nature
Contributing office(s) Western Geographic Science Center
Description Article 39173 ; 10 p.
First page 1
Last page 10