Convergence across biomes to a common rain-use efficiency

Authors

Travis E. Huxman, University of ArizonaFollow
Melinda D. Smith, Yale UniversityFollow
Philip A. Fay, Natural Resources Research Institute
Alan K. Knapp, Colorado State University - Fort CollinsFollow
M. Rebecca Shaw, Carnegie Institution of Washington
Michael E. Loik, University of California - Santa CruzFollow
S. D. Smith, University of Nevada, Las VegasFollow
D. T. TissueFollow
J. C. Zak
J. F. Weltzin
W. T. Pockman
O. E. Sala
B. Haddad
J. Harte
George W. Koch, Northern Arizona UniversityFollow
S. Schwinning
E. A. SmallFollow
D. G. WilliamsFollow

Document Type

Article

Publication Date

6-2004

Publication Title

Nature

Volume

429

Issue

6992

First page number:

651

Last page number:

654

Abstract

Water availability limits plant growth and production in almost all terrestrial ecosystems1, 2, 3, 4, 5. However, biomes differ substantially in sensitivity of aboveground net primary production (ANPP) to between-year variation in precipitation6, 7, 8. Average rain-use efficiency (RUE; ANPP/precipitation) also varies between biomes, supposedly because of differences in vegetation structure and/or biogeochemical constraints8. Here we show that RUE decreases across biomes as mean annual precipitation increases. However, during the driest years at each site, there is convergence to a common maximum RUE (RUEmax) that is typical of arid ecosystems. RUEmax was also identified by experimentally altering the degree of limitation by water and other resources. Thus, in years when water is most limiting, deserts, grasslands and forests all exhibit the same rate of biomass production per unit rainfall, despite differences in physiognomy and site-level RUE. Global climate models9, 10 predict increased between-year variability in precipitation, more frequent extreme drought events, and changes in temperature. Forecasts of future ecosystem behaviour should take into account this convergent feature of terrestrial biomes.

Keywords

Climate change; Drought; Plant water use; Rain-use efficiency; Temperature change; Terrestrial biomes

Disciplines

Climate | Environmental Indicators and Impact Assessment | Plant Biology | Systems Biology | Terrestrial and Aquatic Ecology

Language

English

Publisher Citation

Huxman, T. E., Smith, M. D., Fay, P. A., Knapp, A. K., Shaw, M. R., Loik, M. E., ... & Williams, D. G. (2004). Convergence across biomes to a common rain-use efficiency. Nature, 429(6992), 651-654.

Repository Citation

Huxman, T. E., Smith, M. D., Fay, P. A., Knapp, A. K., Shaw, M. R., Loik, M. E., Smith, S. D., Tissue, D. T., Zak, J. C., Weltzin, J. F., Pockman, W. T., Sala, O. E., Haddad, B., Harte, J., Koch, G. W., Schwinning, S., Small, E. A., Williams, D. G. (2004). Convergence across biomes to a common rain-use efficiency. Nature, 429(6992), 651-654.
http://dx.doi.org/10.1038/nature02561