Journal
ECOLOGY LETTERS
Volume 21, Issue 5, Pages 674-682Publisher
WILEY
DOI: 10.1111/ele.12935
Keywords
N-15 stable isotopes; global warming; grassland species; nitrogen cycling; plant uptake; pulse-chase; reallocation; resorption; semi-arid
Categories
Funding
- US Department of Agriculture (USDA) Agricultural Research Service Climate Change, Soils and Emissions Program
- USDA-Cooperative State Research, Education, and Extension Service Soil Processes Program [2008-35107-18655]
- Department of Energy Office of Science (Biological and Environmental Research) [DE-SC0006973]
- Western Regional Center of the National Institute for Climatic Change Research
- National Science Foundation Division of Environmental Biology [1021559]
- Office Of The Director [1208909] Funding Source: National Science Foundation
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Temporal variation in soil nitrogen (N) availability affects growth of grassland communities that differ in their use and reuse of N. In a 7-year-long climate change experiment in a semi-arid grassland, the temporal stability of plant biomass production varied with plant N turnover (reliance on externally acquired N relative to internally recycled N). Species with high N turnover were less stable in time compared to species with low N turnover. In contrast, N turnover at the community level was positively associated with asynchrony in biomass production, which in turn increased community temporal stability. Elevated CO2 and summer irrigation, but not warming, enhanced community N turnover and stability, possibly because treatments promoted greater abundance of species with high N turnover. Our study highlights the importance of plant N turnover for determining the temporal stability of individual species and plant communities affected by climate change.
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