Table 2. Mean ambient plant surface temperatures (± SD) and the
degrees above ambient achieved by the warming treatment from June
1st to September 30th (the portion
of the growing season when the majority of photosynthesis occurs, and
all our measurements were conducted). Means are shown for 24h periods,
as well as for the period of the day when most photosynthetic activity
occurs (08:00-16:00 hours) for the days when gas exchange measurements
were conducted and overall means for the entire period between June
1st and September 30th across all
years. All averages are pooled across years (2009 – 2019) and both
sites (Cloquet Forestry Center – in Cloquet, MN and Hubachek Wilderness
Research Center – Ely, MN), but separately for both canopies.