Geography Reference
In-Depth Information
Figure 4. Change dynamics detected in the PNA
ha
% PNA
% change
% dynamics
FE
2,884.1
5.4
26.6
3.0
SE
2,076.7
3.9
19.5
2.1
AA
3,235.9
6.1
29.8
3.3
NC
955.1
1.8
8.8
1.0
URB
1,700.9
3.2
15.7
1.7
NCh
42,081.8
79.5
43.1
Table 5. Total surface of each dynamic and percentage area over PNA, change and dynamics areas
Percentage area of these types of dynamics in the PNA allowed us to establish four
categories or degrees of change: very dynamic (ratio change > 60%); dynamic (ratio change
20-60%); stable (ratio change 12-20%); very stable areas (ratio change <12%) (Figure 5).
The more stables areas were located in the North part of the PNA. Dynamic areas increased
from piedmont to Tagus Basin, especially in Madrid and its Metropolitan Area. This has
facilitated to select three zones with different land use dynamism (1975-2009). First, a very
stable area, named Cerceda that is located on rocky piedmont (over gneisses). The second,
Torrelodones, is a transitional area between rocky piedmont and Tagus Basin where urban
development is the most significant process (dynamic area). Finally, in the Southeast was
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