Warming & Grazing
2009: warming and grazing effects

Researchers: Dr. Brenda Casper, Dr. Brent Helliker, Dr. Pierre Liancourt, Dr. Alain Plante

During the summer of 2008, we determined that both the non-warming control and the warming chambers (OTC) increased mean daily temperatures by approximately 2°C, with no difference between the two chambers. In 2009, we replaced the non-warming controls with an open-sided design (OSC) projected to more accurately simulate the greenhouse radiation effect.

Schematic representation of the study site
Schematic representation of the study site. Numbers refer to locations of the 2009 experiments described below.

1-2-3-4: Effect of warming (OTCs increase air temperatures by ~ 2°C and soil temperatures by ~ 1°C) on soil respiration.

3-4: Effect and the interaction between warming (OTCs and OSCs mainly warming at night) and grazing (fences) on species composition, functional composition and trait distribution.

3-4: Intensity and direction of biotic interactions on specialist and ubiquitous species along the topographic gradient.

3: Selective removal of the dominant species Carex pediformis to test how it filters the community composition, functional composition and phenology. The experiment will be coupled with a seed supplementation experiment from species mainly occuring at site 4 and having a low abundance or not at site 3.

3-4: Mycorrhizal community: We documented at least 8 mycorrhizal speces among the genera Acaulospora, Glomus and Scatellopora.

3-4: Within species differentiation along the topographic gradient and the differential response of 'ecotypes' to the warming and grazing treatments using reciprocal transplantation and removal experiments.

Lower slope
Warming and grazing treaments on the lower south exposure (3).

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