Spatiotemporal patterns and drivers of orchard meadow loss in South Tyrol, Italy

Abstract

Orchard meadows, a specific agroforestry system characterised by scattered high-stem fruit trees, are a traditional element of several cultural landscapes in Central Europe and provide important ecosystem services. Since the middle of the 20th century, orchard meadows have drastically declined across Europe. Spatial information on the drivers and patterns of such a decline in several regions in Central Europe is lacking. In this study, we aimed to provide the first detailed insights into the development of orchard meadows in South Tyrol. We assessed the current distribution of orchard meadows in South Tyrol (Northern Italy) and analysed the patterns and drivers of their decline over the last 75 years. Aerial images of the orchard meadows in South Tyrol from the 1950s up to the 2020s were examined, and changes in their distribution were statistically analysed. The results revealed that the historical orchard meadow area in South Tyrol has decreased by more than 6,000 ha (-95%) over the past 75 years, showing one of the largest reductions in Central Europe. Orchard meadow loss was highest at lower elevations (-5,155 ha), shallow slopes (-4,313 ha), and expositions towards the south (-5,035 ha). Orchard meadows have declined due to agricultural intensification towards the establishment of modern fruit orchards (56%) and intensively managed grasslands (8%), urbanisation (23%), and reforestation (6%), and other types of land use/land cover (6.5%). Only 0.5% of the traditional orchard meadows have been preserved. The results suggest that orchard meadows are at a high risk of disappearing from the South Tyrolean landscape, resulting in the loss of genetic diversity of many local or indigenous fruit varieties (especially apples and pears). Immediate action is needed to safeguard the current orchard meadow population and appropriate management measures are needed to highlight the multiple values of orchard meadows and provide a valuable alternative to intensive arable farming.

Keywords: Agroforestry; Cultural landscape; Land use/Land cover change; Temperate climate.

Fig. 1

Distribution of orchard meadows in South Tyrol in 1955 (6,365 ha) and 2020 (296 ha) as well as the distribution of conserved orchard meadows (33 ha). The conserved map segment shows the orchard meadows present in both 1955 and 2020. The points represent the centre of corresponding orchard meadow polygons. The orchard meadow count (n) is displayed in the bottom-right corner of each map segment. The elevation gradient layer has been generated using the Digital Elevation Model of South Tyrol dataset. The compilation of maps was generated using ArcGis Pro 3.3.1.

Fig. 2

Changes in the total area of orchard meadows from the 1950s (a) and relative distribution by elevation (b), slope (c), tree density (only for the district of Vinschgau) (d), and exposition (e).

Fig. 3

Transformation of historical orchard meadows into current land-use/land-cover (LULC) in the districts of South Tyrol.

Fig. 4

South Tyrol, the study area, is the northernmost province of Italy (IT) and is adjacent to Switzerland (CH) and Austria (AT). It is divided into eight districts: Bozen (1), Burggrafenamt (2), Eisacktal (3), Pustertal (4), Salten-Schlern (5), Überetsch-Südtiroler Unterland (6), Vinschgau (7), and Wipptal (8). The map was generated using ArcGis Pro 3.3.1.

Fig. 5

Example of the mapping approach using orthophotos of 1954–56 (resolution: 1.5 × 1.5 m) (a) and 2020 (resolution: 0.2 × 0.2 m) (b) in detail at Prad am Stilfserjoch (Vinschgau; 10.584635°E, 46.616560°N). The compilation of maps was generated using ArcGis Pro 3.3.1.