X hits on this document

PDF document

The Forest Map of Spain 1:200,000. Methodology and analysis of general results - page 9 / 16





9 / 16


J. Ruiz del Castillo et al. / Invest Agrar: Sist Recur For (2006) Fuera de serie, 24-39

50% 45% 40% 35% 30% 25% 20% 15% 10% 5% 0%

50% 45% 40% 35% 30% 25% 20% 15% 10% 5% 0%



Figure 8. Area percentages of the Climatic-Structural Types for peninsular Spain plus the Balearic Islands regarding the total surveyed area, according to the MF2C. A: High mountain. T: Raiga. C: Deciduous. S: Subsclerophyll. E: Esclerophyll. H: Hyperxerophile. IZ: global set of the Intrazonal vegetation types.

Figure 9. Area percentages regarding the total surveyed area of the main Climatic-Structural Types in the Canary Islands accor- ding to the MF2C. S: high mountain type. SA: alize tradewinds forests. SE: extra alize tradewinds forests. I: below potential fo- rest belt. H: hyperxerophile. IZ: group of intrazonal types.

with medium-height (15.67%) and low scrubs (14.17%), whereas high shrublands only represent around 6%. Other categories which do not correspond to the height levels are gathered into a group designated as Other structures.

Percentages of areal presence of structure categories and types are shown on Table 2. Values show that CST which have the highest percentages among arboreous category are Taiga-like (59.08%) and Deciduous (56.37%). At the opposite end, Hyperxerophile has the lowest value (just over 9%). Sclerophyll (31.50%) and Subsclerophyll Types (42.56%) have intermediate values. The intrazonal types, with a significant 28.84%, have an arboreous portion mainly in river forests, and sandy, rocky, karst, or stony soil etc. interspersed in the domains of Sclerophyll, Subsclerophyll, Deciduous and Taiga-like Types.

Area percentages occupied by the main vertical structure categories within Subsclerophyll and Sclero- phyll (the most extended types in continental Spain

and Balearic Islands) are set out in Figures 10 and 11.

In the Canary Islands, the land covered by structure categories according to types is shown in Table 3. It can be stood out from the values that Alize tradewinds forests and Extra Alize tradewinds forests types re- present more than 50% of the area with tree height, reaching 29% in the intrazonal types. Medium scrubs prevail in all types. Hyperxerophile, mostly represented by low and medium scrubs, shows a small percentage of subarboreous height which corresponds either to communities of adventitious plants (such as Nicotiana glauca) or transitional covers between zonal and intra- zonal vegetation (like the small termophile thickets of Phoenix canariensis, Pistacia atlantica and Dracaena draco).

The distribution of areal percentages values obtai- ned from the EL in peninsular Spain and Balearic Islands according to the surveyed total are displayed on Table 4, along with the Canary Islands values on Table 5.

Table 1. Distribution of the main vertical structure catego- ries of peninsular Spain plus Balearic Islands in terms of percentage of the total analyzed area

Height categories


Arboreous Subarboreous High scrubs Medium scrubs Low scrubs Dwarf or creeping scrubs Other structures

39.24 21.59 5.96 15.67 14.17 0.7 2.67

Approximately 38% of the area within High Mountain Type domain has medium and high levels (between 4 and 7). The data analysis reveal that 23.1% has very low levels (from 0 to 2), although they partially include the most possible high complex plant covers due to the particular site conditions in this altitudinal belt.

In Taiga-like almost 60% is valued with levels between 5 and 7, considerable maturity degrees related to good protection conditions in headwater areas of catchments where they are located. A significant 40% is constituted by plant communities which can increase their maturity.

Document info
Document views41
Page views47
Page last viewedSat Oct 22 07:43:53 UTC 2016