Results of Monitoring at Olkiluoto in 2006 - Environment (pdf) - Posiva
Results of Monitoring at Olkiluoto in 2006 - Environment (pdf) - Posiva
Results of Monitoring at Olkiluoto in 2006 - Environment (pdf) - Posiva
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
14Table 7. Total concentr<strong>at</strong>ions (%) <strong>of</strong> carbon and nitrogen and C/N r<strong>at</strong>io by soil layerand by dom<strong>in</strong>ant tree species <strong>in</strong> the 85 m<strong>in</strong>eral soil FEH plots. Values <strong>of</strong> the controlplots (n=9) are <strong>in</strong> italics (Tamm<strong>in</strong>en et al. 2007). Equal mean values are marked withthe same letter (Bonferroni test).Organic0-10cm10-30 cmn C N C/NP<strong>in</strong>e 30 37.5 30.2 1.47 a 1.03 25.6 c 28.9Spruce 40 39.7 37.6 1.73 a 1.47 23.4 bc 25.8Birch 10 36.9 1.73 a 21.4 bAlder 5 36.0 2.32 b 15.5 aP<strong>in</strong>e 22 2.0 1.8 0.12 0.09 16.8 19.5Spruce 39 2.2 3.6 0.14 0.18 16.2 20.6Birch 10 2.1 0.14 15.0Alder 5 2.0 0.15 13.2P<strong>in</strong>e 22 1.1 1.1 0.08 0.06 12.8 17.6Spruce 39 0.7 1.9 0.06 0.11 11.6 17.9Birch 9 0.8 0.06 11.8Alder 5 0.7 0.07 10.0Total elemental concentr<strong>at</strong>ions were determ<strong>in</strong>ed only from the organic samples. Allelements, except for Mn, seemed to have higher concentr<strong>at</strong>ions <strong>at</strong> <strong>Olkiluoto</strong> than on thecontrol plots.N<strong>in</strong>e pe<strong>at</strong> plots were studied with<strong>in</strong> the survey. The pH <strong>in</strong> pe<strong>at</strong> ranged from 3.4 to 4.5,depend<strong>in</strong>g from dom<strong>in</strong>ant tree species, pe<strong>at</strong> layer and method. The nitrogen concentr<strong>at</strong>ionvaried between 1.36% and 2.92% (Table 8). Pe<strong>at</strong> C/N r<strong>at</strong>ios were mostly under 25-30, and <strong>in</strong>dic<strong>at</strong>ed s<strong>at</strong>isfactory nitrogen m<strong>in</strong>eralis<strong>at</strong>ion conditions. In pe<strong>at</strong>land p<strong>in</strong>estands, both low nitrogen concentr<strong>at</strong>ion and high C/N r<strong>at</strong>io <strong>in</strong> the pe<strong>at</strong> <strong>in</strong>dic<strong>at</strong>ed poorernutritional st<strong>at</strong>us than <strong>in</strong> deciduous tree stands (Table 9). Soil carbon and nitrogenamounts <strong>in</strong>creased from p<strong>in</strong>e-grow<strong>in</strong>g pe<strong>at</strong>land sites to alder forests. The total P, Caand Mn concentr<strong>at</strong>ions <strong>in</strong> pe<strong>at</strong> were rel<strong>at</strong>ively similar to the values reported for correspond<strong>in</strong>gdra<strong>in</strong>ed pe<strong>at</strong>land types and pe<strong>at</strong> layers <strong>in</strong> southern F<strong>in</strong>land (Kaunisto &Paavila<strong>in</strong>en 1988, Kaunisto & Moilanen 1998). In contrast, the K, Mg, Cu, Zn, B andFe concentr<strong>at</strong>ions <strong>in</strong> the pe<strong>at</strong> <strong>at</strong> <strong>Olkiluoto</strong> were 2 to 40 times gre<strong>at</strong>er than the values forsouthern F<strong>in</strong>land.Carex pe<strong>at</strong>s with pe<strong>at</strong> components <strong>of</strong> Cyperaceous, Sphagnum, Phragmites australis,lignum and Equisetum dom<strong>in</strong><strong>at</strong>ed <strong>in</strong> Olkiluodonjärvi. On two alder-dom<strong>in</strong><strong>at</strong>ed pe<strong>at</strong>landloc<strong>at</strong>ions, the dom<strong>in</strong><strong>at</strong><strong>in</strong>g pe<strong>at</strong> types were woody and Carex pe<strong>at</strong>s, i.e., Cyperaceouslignumor lignum-Cyperaceous pe<strong>at</strong>. Other typical pe<strong>at</strong> types were Sphagnum (p<strong>in</strong>edom<strong>in</strong><strong>at</strong>edLiiklansuo), and Sphagnum-lignum and lignum-Sphagnum.
Change language