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- Title
Plant organic N uptake maintains species dominance under long-term warming.
- Authors
Jiang, Lili; Wang, Shiping; Zhe, Pang; Xu, Xingliang; Kardol, Paul; Li, Yaoming; Zhang, Lirong; Wang, Yanfen; Lei, Zhong; Lan, Zhichun; Hill, Paul W.; Zhang, Zhenhua; Luo, Caiyun; Rui, Yichao; Ning, Dong; Jones, Davey L.
- Abstract
Background and aims: There is ample experimental evidence for shifts in plant community composition under climate warming. To date, however, the underlying mechanisms driving these compositional shifts remain poorly understood.Methods: The amount and form of nitrogen (N) available to plants are among the primary factors limiting productivity and plant coexistence in terrestrial ecosystems. We conducted a short-term 15N tracer experiment in a ten-year warming and grazing experiment in an alpine grassland to investigate the effects of warming and grazing on plant uptake of NO3−-N, NH4+-N, and glycine-N. Four dominant plant species (Kobresia humilis, Potentilla anseria, Elymus nutans, Poa annua) were selected. Results We found that 10-years of warming decreased plant uptake of inorganic N by up to 80% in all species. In contrast, warming increased the uptake of organic N in K. humilis, P. anseria, and E. nutans but not in P. annua. Results showed that plant relative biomass increased hyperbolically with the ratio of the plant species total uptake of available N and plant community uptake of available N. And a significant positive correlation between plant species uptake of soil glycine-N and the uptake of total available N.Conclusions: The stable relative biomass of plant species is largely dependent on organic N uptake by plants. We conclude that plant organic N uptake maintains species dominance under long-term warming.
- Subjects
NITROGEN in soils; GLOBAL warming; PLANT productivity; PLANT species; PLANT growth
- Publication
Plant & Soil, 2018, Vol 433, Issue 1/2, p243
- ISSN
0032-079X
- Publication type
Article
- DOI
10.1007/s11104-018-3836-x