Photosynthetic data on experimentally warmed tree species in northern Minnesota, 2009-2011, used in the paper Reich et al Nature 2018.

To test how climate warming and variation in soil moisture supply will
jointly influence photosynthesis of southern boreal forest tree
species we measured gas exchange rates of 11 species in an open-air
warming experiment at two sites in northern Minnesota, USA. The
experiment ran for three years and used juveniles of 11 temperate and
boreal tree species under ambient and seasonally warmed (+3.4 degC
above- and belowground) conditions. We measured in situ
light-saturated net photosynthesis (Anet) and leaf diffusive
conductance (gs) on numerous days across the three growing seasons.
Soil and plant temperatures and soil moisture were continuously
measured from sensor arrays.