Multiple nutrient limitation, climate variability, and biodiversity in grasslands ¶

We applied resource limitation theory to investigate how nutrient limitation and spatial and temporal climate variability altered plant species diversity, net primary productivity, and nitrogen cycling.  By examining productivity and species diversity of grasslands from six continents, we found that release from nutrient limitation may increase the capacity of grasslands to buffer rising atmospheric CO2 through increased primary productivity, but biodiversity decline may constrain this capacity. Maintenance of ecosystem productivity and other provisioning services requires maintaining a degree of nutrient limitation in these water-limited systems. Long-term study of nutrient limitation in a productive grassland in the southern U.S. revealed that multiple nutrient limitation stabilized temporal variation in grassland net primary productivity and community composition by buffering the effects of precipitation variability. These findings reveal how anthropogenic nutrient enrichment and amplified precipitation variability expected in future climate scenarios may interact to fundamentally restructure grassland ecosystems.

My stay at WSL was an exciting and enriching experience, professionally and personally. I was welcomed, well supported, and benefitted greatly from day-to-day collaboration with my hosts. Moreover, WSL has wonderful facilities in a beautiful location just minutes from an exciting city with excellent connections to the rest of Europe and the world.  I'm sure I'll be back to visit in the future.

Laura Yahdjian, IFEVA, CONICET, Department of Ecology, Faculty of Agronomy, University of Buenos Aires, Argentina

Laureano Gherardi, School of Life Sciences, Arizona State University, Tempe, AZ, USA

H. Wayne Polley, USDA-ARS Grassland, Soil, and Water Lab, Temple, TX, USA

Harold Collins, USDA-ARS Grassland, Soil, and Water Lab, Temple, TX, USA