The impact of the growth of new plantation forestry on evaporation and streamflow in the Llanbrynmair catchments J. A. Hudson1, S. B. Crane1, and M. Robinson2 1Institute of Hydrology (Plynlimon), Staylittle, SY19 7DB, Wales, UK. 2Institute of Hydrology, Wallingford, Oxon, OX10 8BB, UK.
Abstract. Annual water balances (1983-1995) for the Cwm and Delyn
catchments at Llanbrynmair Moor in mid-Wales have been used to quantify
the hydrological effects of the land use change in the Cwm from moorland
to forestry. Initially, the actual evaporation (precipitation minus streamflow)
of the Cwm catchment declined rapidly relative to the Delyn, due to the
disruption of the vegetation by ploughing the ground in preparation for
planting the trees. It then increased, more quickly than expected, to greater
levels than for the original moorland since in the early stages of forest
growth a dense understorey of dwarf shrubs contributed to both interception
Citation: Hudson, J. A., Crane, S. B., and Robinson, M.: The impact of the growth of new plantation forestry on evaporation and streamflow in the Llanbrynmair catchments, Hydrol. Earth Syst. Sci., 1, 463-475, doi:10.5194/hess-1-463-1997, 1997.