Report - ICP Forests
Report - ICP Forests
Report - ICP Forests
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78 3. Intensive Monitoring<br />
Figure 3.4.4-1 is the biplot of the model of Table 3.4.4-2. There seem to be two main gradients:<br />
one that is determined by soil chemistry and runs from acid and nutrient-poor to neutral and<br />
nutrient-rich; and an other that is determined by tree species, mainly the contrast coniferous vs.<br />
deciduous. These ecological gradients are at an angle of c. 45 o with the CCA axes (which is<br />
usual if the two gradients are more or less equally important). The third and fourth axis mainly<br />
seem to separate the mediterranean plots from all other plots. There is no single axis that clearly<br />
represents the effect of N deposition; this is also apparent from the canonical coefficients and<br />
their t-values (not shown). Therefore an extra analysis was run where the effect of N deposition<br />
was forced through the first axis. This is achieved by declaring N deposition as the only<br />
environmental variable and moving all other variables with a significant effect in Table 3.4.4-2<br />
to the covariables. The resulting biplot is difficult to interpret and not shown, however the<br />
sample scores on this axis are just significantly correlated with the mean Ellenberg N values (R<br />
= 0.19, N = 111, P = 0.045). The effect of N deposition in the model of Table 3.4.4-2 is<br />
therefore not considered as a spurious effect but most probably represents a real ecological<br />
effect.<br />
A<br />
B<br />
-3 3<br />
Axis 2<br />
Querccer<br />
Mespiger<br />
Fallocon<br />
Prunuspi<br />
Castasat<br />
Cratalae<br />
Quercpet SorbutorLathyven<br />
Alliapet<br />
Ranunaur<br />
Carpibet<br />
Pinussyl<br />
Cratamon<br />
Pinusstr<br />
Stellhol<br />
Ilex aqu<br />
Prunuser Quercrob<br />
Prunuavi<br />
Betulpen<br />
Acer cam<br />
Potenste<br />
Corylave<br />
Geum urb<br />
Anemonem<br />
Sorbuauc<br />
Dryopcar<br />
Rosa can<br />
Rosa arv<br />
Piceaabi<br />
Rubusida Dryopfil<br />
Fagussyl<br />
Oxaliace<br />
Dryopdil<br />
Rubusfru Acer pla<br />
Fragaves<br />
Athyrfil<br />
Abiesalb<br />
Impatnol<br />
Pseudmen<br />
Geranrob<br />
Hepatnob<br />
Viciasep<br />
Acer pse Mercuper<br />
Ulmusgla<br />
Lathyver<br />
Silendio<br />
Lathypra<br />
Equisarv<br />
Cardafle Chrysalt<br />
Stellnem Cardaama<br />
Ribesalp<br />
Aruncdio<br />
Cardahep Cardapen<br />
Rosa pen<br />
Axis 1<br />
Ranunfic<br />
-1.0 1.0<br />
conf_Tr<br />
Axis 2<br />
Qurp_Tr<br />
AtlS_Cli<br />
AtlN_Cli<br />
Pins_Tr<br />
Lat<br />
Ndep00_EMEP<br />
QurM_Tr<br />
deci_Tr<br />
Age<br />
Lon<br />
Bor_Cli<br />
Ca_org pH_org<br />
P_org<br />
N/C_org<br />
K_org<br />
Pice_Tr<br />
Fags_Tr<br />
CEC_min<br />
Axis 1<br />
-2 3<br />
-0.6 1.0