%0 Research article
%T Export of dissolved organic carbon, nitrogen and phosphorus following clear-cutting of three Norway spruce forests growing on drained peatlands in southern Finland
%A Nieminen, Mika
%D 2004
%J Silva Fennica
%V 38
%N 2
%R doi:10.14214/sf.422
%U https://silvafennica.fi/article/422
%X The effect of clear-cutting on the concentrations of dissolved organic  carbon (DOC), organic nitrogen (DON), NH4+, NO3–, and P in outflow water  from three productive, Norway spruce dominated drained peatlands (RCC,  VCC-1, VCC-2) were studied. Changes in runoff and transport loads  (concentration x runoff) at two of the catchments during the frost-free  period are also presented. Approximately 40% of the area was cut at RCC  and VCC-2, and 72% at VCC-1. The volume removed was 250 m3 ha–1 at RCC,  259 m3 ha–1 at VCC-1, and for VCC-2, 317 m3 ha–1. The mean annual  increase in outflow concentrations of DOC during the first four years  after clear-cutting was 9.0 mg l–1 at RCC, 22.8 mg l–1 at VCC-1 and 8.4  mg l–1 at VCC-2. Corresponding increases in the forms of nitrogen were:  0.23, 0.51 and 0.16 mg DON l–1; 0.06, 0.31 and 0.04 mg NH4+-N l–1; and  0.05, 0.12 and 0.22 mg NO3–-N l–1. Clear-cutting did not significantly  (p > 0.05) increase P concentrations. The increase in non-frost  season runoff over the first three years after clear-cutting was 107 mm  at RCC and 207 mm at VCC-1. The export loads of DOC during the non-frost  season increased by 80 kg ha–1 at RCC and by 184 kg ha–1 at VCC-1 over  the first three years. Corresponding increases for the other studied  solutes were: 1.78 and 3.98 kg DON ha–1; 0.39 and 1.49 kg NH4+-N ha–1;  0.45 and 0.48 kg NO3–-N ha–1, and 0.09 and 0.06 kg P ha–1. The study  demonstrated that clear-cutting may significantly increase the export of  DOC and different forms of nitrogen from drained productive peatlands  while only small increases in phosphorus export may occur.