Simulated effects of nitrogen saturation the global carbon budget using the IBIS model
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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.
| 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 |
| Google Analytic Metrics | Metrics page |