Canopy interaction with precipitation and sulphur deposition in two boreal forests of Quebec, Canada

► We investigated sulphur interactions with the canopy of two boreal forests, Québec. ► Sulphur interchanges within the canopy were large and vary with seasons. ► About 1.2 kg S-SO4 ha−1 yr−1 was taken up by the canopy during warm seasons. ► This represents 30-40% of annual wet S-SO4 deposition. ► Canopy uptake must be considered for sulphur budget estimations in boreal forests.