Biomass and height increment measurements
Height increments of the moss in the mesocosms were measured weekly
during the incubation period (Fig. S2), using five brush wires (Rydin &
Jeglum, 2013) inserted into each mesocosm container. At the end of the
incubation period, biomass formed during the incubation was harvested by
cutting the moss at its initial height (essentially its capitulum),
based on the brush wire data. Its fresh weight was determined and the
material was dried at 60°C for 48 h to determine the dry weight and
subsequently the water content of the moss. The biomass production of
each replicate (moss in each container) was estimated by dividing the
dry weight of each replicate obtained after harvest, by its surface area
(calculated based on container dimensions) and incubation time. Biomass
density was calculated by dividing the dry weight of each replicate by
its surface area and total height increment.