Nomenclature: Cabrera & Zardini (1978); Correa (1971–1988); Anon. (2005).
Trait differences between grass species along a climatic gradient in South and North America
Article first published online: 29 JAN 2009
2008 IAVS - the International Association of Vegetation Science
Journal of Vegetation Science
Volume 19, Issue 2, pages 183–192, April 2008
How to Cite
Oyarzabal, M., Paruelo, J. M., del Pino, F., Oesterheld, M. and Lauenroth, W. K. (2008), Trait differences between grass species along a climatic gradient in South and North America. Journal of Vegetation Science, 19: 183–192. doi: 10.3170/2007-8-18349
- Issue published online: 29 JAN 2009
- Article first published online: 29 JAN 2009
- Received 15 May 2007; Accepted 27 June 2007
- Dominant grass;
- Plant trait;
- Temperate grassland;
Question: Are trait differences between grasses along a gradient related to climatic variables and/or photosynthetic pathway?
Location: Temperate grassland areas of South and North America.
Methods: In a common garden experiment, we cultivated C3 and C4 grasses from grasslands under different climatic conditions, and we measured a set of 12 plant traits related to size and resource capture and utilization. We described (1) interspecific plant trait differences along a climatic gradient defined by the precipitation and temperature at the location where each species is dominant and (2) the association between those plant trait differences and the photosynthetic pathway of the species.
Results: Trait differences between grasses were related to the precipitation at the area where each species is dominant, and to the photosynthetic pathway of the species. Leaf length, leaf width, plant height, leaf area per tiller, specific leaf area, leaf δ13C ratio, and nitrogen resorption efficiency increased while leaf dry matter content and nitrogen concentration in senesced leaves decreased as precipitation increased. A proportion of these changes along the gradient was related to the photosynthetic pathway because dominant grass species in cold areas with low precipitation are mainly C3 and those from warm and wet areas are C4.
Conclusions: A previous worldwide analysis showed that traits of graminoid species measured in situ changed slightly along climatic gradients (< 10% variance explained). In contrast, under a common environment we observed that (1) grass traits changed strongly along a climatic gradient (30-85% variance explained) and, (2) a proportion of those changes were related to the association between photosynthetic pathway of the species and precipitation.