Report - ICP Forests

3. Intensive Monitoring 57
Table 3.3.2.2-1: Data availability in percent of all measurements for parameters of soil solution survey
Parameter Mandatory/optional Availability
(% of all data sets)
pH mandatory 69.2
Conductivity µS/cm mandatory 58.0
K (mg/l) mandatory 65.8
Ca (mg/l) mandatory 69.7
Mg (mg/l) mandatory 69.8
N-NO3- (mg/l) mandatory 52.1
S-SO4 (mg/l) mandatory 69.8
Al (mg/l) mandatory if pH < 5 61.5 92.5% of all data sets with pH >5
DOC mg/l mandatory 57.5
Na (mg/l) Optional 59.4
Al-labile (mg/l) Optional 6.4
Fe (mg/l) Optional 4.6
Mn (mg/l) Optional 45.6
P (mg/l) Optional 9.2
N-NH4 (mg/l) Optional 40.9
Cl (mg/l) Optional 58.9
Cr (µg/l) Optional 5.6
Ni (µg/l) Optional 6.1
Zn (µg/l) Optional 17.8
Cu (µg/l) Optional 8.7
Pb (µg/l) Optional 6.5
Cd (µg/l) Optional 8.0
Si (µg/l) Optional 17.4
Alkalinity (µmol/l) Optional if pH > 5 9.6 30.0% of all cases with pH >5
3.3.2.3 Critical limits
In a first step the BC/Al ratio was calculated for each single measurement. This BC/Al ratio was
compared with a main tree species specific critical limit (see Table 3.3.2.3-1). The critical limit
was exceeded if the calculated BC/Al ratio was smaller or equal to the chosen critical limit.
Table 3.3.2.3-1: Tree species specific critical limits of BC/Al ratio that imply growth reductions to 80% of mean
growth according to Sverdrup and Warfvinge, 1993 and Lorenz et al., 2008 (n.s. not specified)
Tree species English name BC/Al crit (growth reduced to Notes
80%)
Betula pendula Birch 0.8
Fagus sylvatica Beech 0.6
Fraxinus excelsior Ash 1.8-2.2
Quercus cerris Turkey Oak n.s. Quercus spec. 0.6
Quercus petraea Sessile Oak n.s. Quercus spec. 0.6
Quercus robur Oak 0.6
Abies alba Silver Fir n.s. Abies spec. 1.2
Larix decidua Larch 2
Picea abies Norway Spruce 1.2
Picea sitchensis Sitka Spruce 0.4
Pinus cembra Cembra Pine 1.2
Pinus nigra European Black Pine n.s. Pinus spec. 1.2
Pinus sylvestris Scots Pine 1.2
Pseudotsuga menziesii Douglas Fir 0.3