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Experimental warming shifts coupling of carbon and nitrogen cycles in an alpine meadow
| Content Provider | Oxford Academic |
|---|---|
| Author | Wang, Song Quan, Quan Meng, Cheng Chen, Weinan Luo, Yiqi Niu, Shuli |
| Copyright Year | 2021 |
| Abstract | Aim: Terrestrial ecosystem carbon (C) uptake is remarkably regulated by nitrogen (N) availability in the soil. However, the coupling of C and N cycles, as reflected by C:N ratios in different components, has not been well explored in response to climate change.MethodsHere, we applied a data assimilation approach to assimilate 14 datasets collected from a warming experiment in an alpine meadow in China into a grassland ecosystem model. We attempted to evaluate how experimental warming affects C and N coupling as indicated by constrained parameters under ambient and warming treatments separately.Important FindingsThe results showed that warming increased soil N availability with decreased C:N ratio in soil labile C pool, leading to an increase in N uptake by plants. Nonetheless, C input to leaf increased more than N, leading to an increase and a decrease in the C:N ratio in leaf and root, respectively. Litter C:N ratio was decreased due to the increased N immobilization under high soil N availability or warming-accelerated decomposition of litter mass. Warming also increased C:N ratio of slow soil organic matter pool, suggesting a greater soil C sequestration potential. As most models usually use a fixed C:N ratio across different environments, the divergent shifts of C:N ratios under climate warming detected in this study could provide a useful benchmark for model parameterization and benefit models to predict C–N coupled responses to future climate change. |
| Related Links | https://academic.oup.com/jpe/article-pdf/14/3/541/36989421/rtab008.pdf |
| Ending Page | 554 |
| Starting Page | 541 |
| File Format | |
| ISSN | 17529921 |
| e-ISSN | 1752993X |
| DOI | 10.1093/jpe/rtab008 |
| Journal | Journal of Plant Ecology |
| Issue Number | 3 |
| Volume Number | 14 |
| Language | English |
| Publisher | Oxford Academic |
| Publisher Date | 2021-06-01 |
| Access Restriction | Open |
| Subject Keyword | Biological Sciences Plant Ecology Plant Sciences and Forestry Science and Mathematics Warming Stoichiometry Bayesian Probabilistic Inversion Markov-chain Monte-carlo (mcmc) Alpine Meadow |
| Content Type | Text |
| Resource Type | Article |
| Subject | Ecology Plant Science Ecology, Evolution, Behavior and Systematics |
