Trait differences between grass species along a climatic gradient in South and North America

Abstract 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. Nomenclature: Cabrera & Zardini (1978); Correa (1971–1988); Anon. (2005).

[1]  P. Reich,et al.  Assessing the generality of global leaf trait relationships. , 2005, The New phytologist.

[2]  Joseph M. Craine,et al.  ENVIRONMENTAL CONSTRAINTS ON A GLOBAL RELATIONSHIP AMONG LEAF AND ROOT TRAITS OF GRASSES , 2005 .

[3]  Daniel G. Milchunas,et al.  Functional traits of graminoids in semi-arid steppes: a test of grazing histories , 2004 .

[4]  J. P. Grime,et al.  The plant traits that drive ecosystems: Evidence from three continents , 2004 .

[5]  Sean C. Thomas,et al.  The worldwide leaf economics spectrum , 2004, Nature.

[6]  Howard E. Epstein,et al.  Regional productivities of plant species in the Great Plains of the United States , 1998, Plant Ecology.

[7]  J. Cavagnaro.  Distribution of C3 and C4 grasses at different altitudes in a temperate arid region of Argentina , 1988, Oecologia.

[8]  James R. Ehleringer,et al.  Implications of quantum yield differences on the distributions of C3 and C4 grasses , 2004, Oecologia.

[9]  M. Westoby,et al.  Plant height and evolutionary games , 2003 .

[10]  S. Verón,et al.  Environmental Controls of Primary Production in Agricultural Systems of the Argentine Pampas , 2002, Ecosystems.

[11]  P. Reich,et al.  Functional traits, productivity and effects on nitrogen cycling of 33 grassland species , 2002 .

[12]  Osvaldo E. Sala,et al.  PATTERNS AND CONTROLS OF PRIMARY PRODUCTION IN THE PATAGONIAN STEPPE: A REMOTE SENSING APPROACH† , 2002 .

[13]  E. Garnier,et al.  A standardized protocol for the determination of specific leaf area and leaf dry matter content , 2001 .

[14]  R. León,et al.  Cross‐scale vegetation patterns of Flooding Pampa grasslands , 2001 .

[15]  P. Reich,et al.  Strategy shifts in leaf physiology, structure and nutrient content between species of high‐ and low‐rainfall and high‐ and low‐nutrient habitats , 2001 .

[16]  David Tilman,et al.  The relationships among root and leaf traits of 76 grassland species and relative abundance along fertility and disturbance gradients , 2001 .

[17]  O. Sala.  12 – Productivity of Temperate Grasslands , 2001 .

[18]  Harold A. Mooney,et al.  Terrestrial Global Productivity , 2001 .

[19]  Jacob McC. Overton,et al.  Shifts in trait‐combinations along rainfall and phosphorus gradients , 2000 .

[20]  William K. Lauenroth,et al.  Changes in grassland canopy structure across a precipitation gradient , 2000 .

[21]  Mark Westoby,et al.  EVOLUTIONARY DIVERGENCES IN LEAF STRUCTURE AND CHEMISTRY, COMPARING RAINFALL AND SOIL NUTRIENT GRADIENTS , 1999 .

[22]  P. Reich,et al.  Generality of leaf trait relationships: a test across six biomes: Ecology , 1999 .

[23]  F. S. Chapin,et al.  The Mineral Nutrition of Wild Plants Revisited: A Re-evaluation of Processes and Patterns , 1999 .

[24]  O. Sala,et al.  Grassland Precipitation-Use Efficiency Varies Across a Resource Gradient , 1999, Ecosystems.

[25]  P. Reich,et al.  Relationships of leaf dark respiration to leaf nitrogen, specific leaf area and leaf life-span: a test across biomes and functional groups , 1998, Oecologia.

[26]  Howard E. Epstein,et al.  EFFECTS OF TEMPERATURE AND SOIL TEXTURE ON ANPP IN THE U.S. GREAT PLAINS , 1997 .

[27]  William K. Lauenroth,et al.  REGIONAL AND TEMPORAL VARIATION IN NET PRIMARY PRODUCTION AND NITROGEN MINERALIZATION IN GRASSLANDS , 1997 .

[28]  M. Cabido,et al.  Distribution of C3 and C4 grasses along an altitudinal gradient in Central Argentina , 1997 .

[29]  I. Burke,et al.  Ecological responses of dominant grasses along two climatic gradients in the Great Plains of the United States , 1996 .

[30]  J. Paruelo,et al.  Relative Abundance of Plant Functional Types in Grasslands and Shrublands of North America , 1996 .

[31]  R. Aerts.  Nutrient resorption from senescing leaves of perennials: are there general patterns? , 1996 .

[32]  P. Donnelly,et al.  Quantitative Leaf Anatomy of C3 and C4 Grasses (Poaceae): Bundle Sheath and Mesophyll Surface Area Relationships , 1994 .

[33]  Donald A. Jackson.  STOPPING RULES IN PRINCIPAL COMPONENTS ANALYSIS: A COMPARISON OF HEURISTICAL AND STATISTICAL APPROACHES' , 1993 .

[34]  F. Chapin,et al.  Nutritional Controls Over Nitrogen and Phosphorus Resorption From Alaskan Birch Leaves , 1991 .

[35]  Keith T. Killingbeck,et al.  The terminological jungle revisited: making a case for use of the term resorption , 1986 .

[36]  S. McNaughton,et al.  Shoot growth and morphometric analyses of Serengeti graminoids , 1985 .

[37]  V. Markgraf,et al.  Late Pleistocene Faunal Extinctions in Southern Patagonia , 1985, Science.

[38]  G. Farquhar,et al.  Isotopic Composition of Plant Carbon Correlates With Water-Use Efficiency of Wheat Genotypes , 1984 .

[39]  S. McNaughton,et al.  Modelling primary production of perennial graminoids 3$̄uniting physiological processes and morphometric traits , 1984 .

[40]  W. Lauenroth.  Grassland Primary Production: North American Grasslands in Perspective , 1979 .

[41]  Á. Cabrera.  Manual de la flora de los alrededores de Buenos Aires , 1954 .