In November2012,the plants were cut back to a height of 50cm
above the gravel bed. The fresh above ground (leaves and stems)
plant parts were only determined on a representative sample of
10 plants from each unit. The biomass dry weight was then
calculated by drying the collected plant material in an oven at 62
C
for 72h.This process was repeated following the next cutting, after
approximately 12 months