An exhaustive inventory of coniferous trees in an agricultural landscape.
BACKGROUND
Various species of forest trees are commonly used for ornamental purposes and are therefore frequently found in non-forest ecosystems. These trees constitute a significant component of the trees outside forests (TOF). Although increasingly recognized as prominent feature of agricultural lands and built-up areas, not much is known, however, about TOF since they are generally absent from forest inventories.


CONCLUSIONS
In the present study, we focus on the coniferous tree species that constitute potential hosts for a forest defoliator, the pine processionary moth Thaumetopoeapityocampa Den. & Schiff. (Lepidoptera, Notodontidae). We carried out an exhaustive inventory of all pines (Pinus spp.), cedars (Cedrus spp.) and Douglas-fir (Pseudotsugamenziesii) in a 22 × 22 km study window located in the open-field region of Beauce in the centre of France. We recorded a total of 3834 individuals or small groups host trees corresponding a density of 7.9 occurrences per 100 ha. We provide the spatial coordinates of the points without differentiation between tree species.
INRA, UR633 Zoologie Forestière, Orléans, France.
Jérôme
J
Rousselet
INRA, UR633 Zoologie Forestière, Orléans, France.
Alain
A
Roques
INRA, UR633 Zoologie Forestière, Orléans, France.
Jacques
J
Garcia
UMR CBGP (INRA/IRD/Cirad/Montpellier SupAgro), Montferrier-sur-Lez, France.
Jean-Pierre
JP
Rossi
Ornamental trees; open-field landscape; pine processionary moth; point pattern; trees outside forests