Data from: Enhanced woody biomass production in a mature temperate forest under elevated CO2

This data set reports tree growth and net primary productivity in response
to experimentally elevated atmospheric CO2 concentration in the free-air
CO2 enrichment (FACE) of the Birmingham Institute of Forest Research
(BIFoR FACE). Data ae reported for a pre-treatment period (2010-2016) and
from the onset of CO2 treatment (2017-2023). The BIFoR FACE experiment is
located in central England (52.801°N, 2.301°W, 107 m above sea level)
within a deciduous forest dominated by 180-year old Quercus robur L.
trees, which represent 92% of the forest’s basal area. There are six
experimental arrays of approximately 30 m diameter. Tree ring analysis was
used to determine growth patterns within the arrays prior to the onset of
CO2 treatment. The trees in three of the arrays have been exposed to
elevated CO2 (ambient concentration + 150 ppm) during the growing seasons
since 2017. Tree diameter was measured with manual dendrometers, and dry
mass of oak trees was calculated using an allometric equation determined
by terrestrial laser scan of the trees within the arrays. Dry matter
production of understory species and coarse roots was calculated using
allometric equations from the literature. Leaf production was calculated
from mass of leaf litter collected in litter baskets. Fine-root production
was measured in ingrowth cores and scaled to 1-meter depth based on
fine-root biomass in deep cores. Exudation rates were scaled up to a full
growing season and total fine-root mass.