Considering that several settlements represented one age category
and one soil type, multicollinearity problems are expected. To resolve
these problems, we looked at urban SOC relative to SOC in the meadow
areas for the different settlements. The meadow areas were chosen
as a standard for comparison as far as they are typical natural
landscapes for the region and they were the only non-urban areas,
sampled in the neighborhoods of all settlements. The relationship between
this relative change with urbanization and the age of the settlement
is presented in Fig. 5. For the topsoil the shape of the curve
has changed. However no correlation between SOC and age was
found. As for the subsoil, the trend remained almost the same. It
may be concluded, that the settlement's history influences mainly
subsoil SOC, whereas topsoil SOC is more dependent on land-use or
zonal soil type. Thus, it was demonstrated, that urban carbon stocks,
mainly concentrated in subsoil, make a considerable contribution to
the regional carbon balance and may have a remarkable influence
on spatial variability of SOC in the region
Considering that several settlements represented one age category
and one soil type, multicollinearity problems are expected. To resolve
these problems, we looked at urban SOC relative to SOC in the meadow
areas for the different settlements. The meadow areas were chosen
as a standard for comparison as far as they are typical natural
landscapes for the region and they were the only non-urban areas,
sampled in the neighborhoods of all settlements. The relationship between
this relative change with urbanization and the age of the settlement
is presented in Fig. 5. For the topsoil the shape of the curve
has changed. However no correlation between SOC and age was
found. As for the subsoil, the trend remained almost the same. It
may be concluded, that the settlement's history influences mainly
subsoil SOC, whereas topsoil SOC is more dependent on land-use or
zonal soil type. Thus, it was demonstrated, that urban carbon stocks,
mainly concentrated in subsoil, make a considerable contribution to
the regional carbon balance and may have a remarkable influence
on spatial variability of SOC in the region
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