An attempt to predict long-term effects of atmospheric nitrogen deposition on the yield of Norway spruce stands (Picea abies (L.) Karst.) in southwestern Sweden |
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Authors: | Persson Olle A Eriksson Harry Johansson Ulf |
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Institution: | (1) Department of Forest Yield Research, Swedish University of Agricultural Sciences, S-776 98 Garpenberg, Sweden;(2) Tönnersjöheden Experimental Forest, Swedish University of Agricultural Sciences, P.O. Box 17, S-310 38 Simlångsdalen, Sweden |
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Abstract: | Long-term field experiments in Norway spruce stands on fertile sites (site indices 27–35 m) in southwestern Sweden were analysed with respect to volume increment. Three treatments were included (0=No fertilization, N = Fertilization with N, NP = Fertilization with N and P).Volume growth was monitored for 18 years in 10 blocks. No significant differences in annual volume increment between the treatments were detected. Volume increments in the N treatment were 97%, 99% and 107% as high as those in the 0 treatment for the periods 1–5, 6–10 and 11–15 years after the first fertilization. Corresponding values for the NP treatment were 104%, 108% and 110%, indicating that P has a small positive effect.The amount of N-fertilization would correspond to an annual N deposition of 20 kg ha-1 during the next 30 years in southwestern Sweden. For this period, the results imply that this N deposition would not affect the growth of Norway spruce stands on fertile sites. |
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Keywords: | forest yield nitrogen deposition nitrogen fertilization Norway spruce phosphorus fertilization |
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