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.
Suggested Citation
Lu, X., Jiang, H., Liu, J., Zhang, X., Jin, J., Zhu, Q., Zhang, Z., and Peng, C., 2016, Simulated effects of nitrogen saturation the global carbon budget using the IBIS model: Scientific Reports, v. 6, p. 1-10, https://doi.org/10.1038/srep39173.
| 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 |
| Publication Date | December 14, 2016 |
| 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 |