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Workreport 2016-22



Results of Forest Monitoring on Olkiluoto Island in 2014


Aro, L., Lindroos, A-J, Rautio, P., Ryynänen, A.



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The forest investigations form a part of the monitoring programme being carried out on the Olkiluoto Island nuclear waste repository site under the management of Posiva Oy. This report focused on activities performed on bulk deposition and forest intensive monitoring plots (MRK and FIP plots) in 2014. Monitoring was initiated on two new FIP plots (15 and 16). There were no other essential changes to the current monitoring networks during 2014.
In general, the level of precipitation was relatively low in 2014. The NH4-N deposition that decreased in 2012 compared to the situation in 2011 remained relatively low also in 2013 and 2014. The NO3-N deposition values increased in 2012 and were the highest for the whole monitoring period during 2004-2012. However, in 2013 the NO3-N deposition decreased and remained at a similar level also in 2014. The SO4-S and Ca depositions were clearly elevated in 2014 on the plot MRK13 which is located close to the construction activities. The soil solution quality in 2014 was also quite comparable to that in earlier years. Annual total litterfall production (212–434 gdw/m2 without larger branches) was lower in coniferous plots in 2013 compared to the previous collection period in 2012. Annual variations recorded on Olkiluoto Island are due to natural reasons. High Al and Fe concentrations were found in the remaining litter, and were most likely due to soil dust. The pines were classified as non-defoliated indicating good crown condition of the trees. The spruces were classified as moderately defoliated.The current annual increment of stem volume (CAI) was very high, 14.2 m3/ha/a, in the Scots pine stand on FIP4 during the last five years. CAI was also high in Norway spruce (FIP10, 9.7 m3/ha/a during the last five years) and birch (FIP11, 9.3 m3/ha/a during the last six years) dominated stands. Instead, CAI was exceptionally low, 4.9 m3/ha/a, in the black alder stand (FIP14) during the last five years. In the spruce stand (FIP10) the birches have reached their mature age. Based on the basal area and stem volume, silver birch has become the dominating tree species on the FIP11 plot.

In connection with the forest inventory in 2014, the thickness of litter (4.2 cm, on average) and organic layers (10.8 cm) were measured from the set of FET plots. No harmful effects of human activities on the forest condition were observed in the nature conservation area.


Bulk deposition, forest ecosystems, litterfall production, soil solution chemistry, stand throughfall, tree stand transpiration.


Results of Forest Monitoring on Olkiluoto Island in 2014 (pdf) (843.4 KB)


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