Report - ICP Forests

72 3. Intensive Monitoring
Table 3.4.2-4A: Treatment of soil data.
Logarithmisation is achieved by transforming X = ln ( X - MIN(X) +1 )
Skewness is computed as
(M 3 - 3M 1 M 2 + 2M 1 3 ) / (M 2 - M 1 2 ) 3/2 with M i = ∑ x i / N
Number of plots with usable soil data: 619
Variable
Layer
Number
of
missing
values
Missing
estimated
on the
basis of
Logaritmised
Outlier
corrected
Skewness
after
correction
pH(CaCl 2 ) organic 0 no no 1,131
N/C organic 0 no no 1,038
Ca organic 44 pH yes yes -1,398
K organic 3 Mg yes no -0,354
Mg organic 0 yes yes -0,072
P organic 51 N/C no no 0,046
pH(CaCl 2 ) mineral 0 no no 2,419
N/C mineral 9 base sat yes yes 2,424
CEC mineral 0 yes no 0,562
base sat mineral 0 no no 1,426
Table 3.4.2-4B: Treatment of deposition data.
Logarithmisation is achieved by transforming X = ln ( X - MIN(X) +1 )
Skewness is computed as
(M 3 - 3M 1 M 2 + 2M 1 3 ) / (M 2 - M 1 2 ) 3/2 with M i = ∑ x i / N
Number of records given in the table.
Element source Number
of plots
Logaritmised?
Outlier
corrected?
Skewness
after
correction
NH4 1995 EMEP estimate 616 no no 1,899
NH4 2000 EMEP estimate 616 no no 1,699
NO3 1995 EMEP estimate 616 no no -0,306
NO3 2000 EMEP estimate 616 no no -0,129
N total 1995 NH4+NO3 1995 616 no no 0,873
N total 2000 NH4+NO4 2000 616 no no 0,947
SO4 1995 EMEP estimate 616 no no 0,922
SO4 2000 EMEP estimate 616 no no 1,755
Quantity bulk deposition 414 no yes 1,147
Ca bulk deposition 414 yes no -0,51
Mg bulk deposition 414 yes no -0,091
K bulk deposition 413 yes no -0,562
Na bulk deposition 414 yes no -0,514
Cl bulk deposition 414 yes no -0,549
NH4 bulk deposition 414 no no 1,132
NO3 bulk deposition 414 yes no -2,34
SO4 bulk deposition 414 yes no -1,759
Ntot NH4 + NO3 414 no no 0,663
Quantity throughfall 278 no yes 1,352
Ca throughfall 278 no no 1,279
Mg throughfall 278 yes no -0,956
K throughfall 278 no no 1,741