Global evidence on nitrogen saturation of terrestrial ecosystem net primary productivity
Global evidence on nitrogen saturation of terrestrial ecosystem net primary productivity
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Full item details
- creativework.keywords - en
- nitrogen deposition
- creativework.keywords - fr
- dépôt d'azote
- dc.contributor.author
- Tian, Dashuan
- Wang, Hong
- Sun, Jian
- Niu, Shuli
- dc.date.accepted
- 2016-02-04
- dc.date.accessioned
- 2024-01-09T15:14:14Z
- dc.date.available
- 2024-01-09T15:14:14Z
- dc.date.issued
- 2016-02-19
- dc.date.submitted
- 2015-10-08
- dc.description.abstract - en
- The continually increasing nitrogen (N) deposition is expected to increase ecosystem aboveground net primary production (ANPP) until it exceeds plant N demand, causing a nonlinear response and N saturation for ANPP. However, the nonlinear response of ANPP to N addition gradient and the N saturation threshold have not been comprehensively quantified yet for terrestrial ecosystems. In this study, we compiled a global dataset of 44 experimental studies with at least three levels of N treatment. Nitrogen response efficiency (NRE, ANPP response per unit N addition) and the difference in NRE between N levels (ΔNRE) were quantified to test the nonlinearity in ANPP response. We found a universal response pattern of N saturation for ANPP with N addition gradient across all the studies and in different ecosystems. An averaged N saturation threshold for ANPP nonlinearity was found at the N addition rates of 5–6 g m−2 yr−1. The extent to which ANPP approaches N saturation varied with ecosystem type, N addition rate and environmental factors. ANPP in grasslands had lower NRE than those in forests and wetlands. Plant NRE decreased with reduced soil C:N ratio, and was the highest at intermediate levels of rainfall and temperature. These findings suggest that ANPP in grassland or the ecosystems with low soil C:N ratio (or low and high rainfall or temperature) is easier to be saturated with N enrichment. Overall, these results indicate that the beneficial effect of N deposition on plant productivity likely diminishes with continuous N enrichment when N loading surpasses the N saturation threshold for ANPP nonlinearity.
- dc.identifier.citation
- Tian, D., Wang, H., Sun, J., & Niu, S. (2016). Global evidence on nitrogen saturation of terrestrial ecosystem net primary productivity. Environmental Research Letters, 11(2), Article 24012. https://doi.org/10.1088/1748-9326/11/2/024012
- dc.identifier.doi
- https://doi.org/10.1088/1748-9326/11/2/024012
- dc.identifier.issn
- 1748-9326
- dc.identifier.uri
- https://open-science.canada.ca/handle/123456789/1592
- dc.language.iso
- en
- dc.publisher
- IOP Publishing
- dc.rights.openaccesslevel - en
- Gold
- dc.rights.openaccesslevel - fr
- Or
- dc.subject - en
- Nature and environment
- dc.subject - fr
- Nature et environnement
- dc.subject.en - en
- Nature and environment
- dc.subject.fr - fr
- Nature et environnement
- dc.title - en
- Global evidence on nitrogen saturation of terrestrial ecosystem net primary productivity
- dc.type - en
- Article
- dc.type - fr
- Article
- local.acceptedmanuscript.articlenum
- 024012
- local.article.journalissue
- 2
- local.article.journaltitle
- Environmental Research Letters
- local.article.journalvolume
- 11
- local.pagination
- 1-9
- local.peerreview - en
- Yes
- local.peerreview - fr
- Oui
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