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104

L. E. Romero Martín et al.

rapid change on the island from an agricultural-based economic system to a service-based one (tourism and services), which in turn triggered a trend for agricultural abandonment. Currently, the island is a nature (hiking), cultural, and scientic tourist destination.

In addition to the impact of tourism, the abandonment of agricultural practices and an aging and falling population are endangering conservation of the highly valued cultural landscapes of the island, as well as its agrodiversity.

The terraced slopes are the most remarkable of the agrosystems in La Gomera, given their beauty, abundance, and magnitude. They constitute a human adaptation to the adverse conditions of the islands topography. Although terrace walls (Ecoplán de La Gomera, planes de Medianías) have been repaired and the landscaping idea for the walls or paredoneshas been restored with a new procedure put into practice, this custody of the land has not been enough to stop the present state of neglect of many of them.

Other elements of these landscapes that should not be separated from the terraces include the palm groves and hamlets. Examples of terraced landscapes with associated palm groves include Tazo, Alojera, Taguluche, Vallehermoso, and Valle Gran Rey.

7.3Methods

This study was based on the use of different spatial sources (Table 7.1) and its analysis using geographic information systems (GIS).

Table 7.1 Spatial sources

 

Year

Spatial

Source

 

 

resolution

 

 

 

(m)

 

Digital orthophoto

1964

0.80

IDE Canarias. GRAFCAN (Gobierno de

 

 

 

Canarias)

Digital orthophoto

2016

0.25

IDE Canarias. GRAFCAN (Gobierno de

 

 

 

Canarias)

DEM (digital

2009

5

Instituto Geográfico Nacional (IGN)

elevation model)

 

 

 

Geology GIS layer

2010

Instituto Geológico y Minero de España (IGME)

Land cover GIS

2002

GRAFCAN (Gobierno de Canarias)

layer

 

 

 

Crops GIS layer

2003

Consejería de Agricultura, Ganadería, Pesca y

 

 

 

Alimentación (Gobierno de Canarias)

Protected Nature

Dirección General de Ordenación del Territorio

Areas GIS layer

 

 

(Gobierno de Canarias)