Dataset and R codes for the article: Acclimation of photosynthetic capacity of key mature North America’s boreal conifers to whole-ecosystem warming and elevated CO2 in the field

This dataset contains empirical data on photosynthetic capacity (<em>V</em>cmax and <em>J</em>max), and associated leaf mass per unit area (LMA) and leaf Nitrogen (N) data collected on two dominant conifer species, <em>Picea mariana</em> and <em>Larix laricina</em>, in June and August 2017 at the SPRUCE (Spruce and Peatland Responses Under Changing Environments) experiment that assesses the response of peatland ecosystems to whole-ecosystem warming and elevated atmospheric CO2 concentrations. The SPRUCE experiment is located 40 Km north of Grand Rapids, MN, in the USDA Forest Service Marcell Experimental Forest.