High nature value farmlands can be considered as an indicator of land use intensity. Land cover changes have an impact on such farmlands if they occur on them. These impacts can be positive or negative. Agricultural extensification should in general have a positive effect on already rather extensively used farmland, but is clearly positiveon agricultural landscapes that are used more intensively (e.g. arable land or permanent crops).

The following land cover flows are grouped into agricultural extensification:

Conversions arable land to grassland (rotation)
Conversions arable land to permanent crops
Extension agro-forestry systesms (e.g. dehesas, montanas)
Farmland abandonment towards (semi-)natural land

These data are crossed with the HNV farmland 2006 layer to map areas where those two data sets overlap. The share of areas affected is then computed per NUTS 3 by means of zonal statistics.

More information on HNV farmland: http://www.eea.europa.eu/data-and-maps/data/high-nature-value-farmland (+ include link to registration document of HNV farmlands)

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