
Fig. 1
Geographical location of Ilam province in Iran (A), digital elevation model of Ilam province (B) and its forests (C).
Table 1
Parameters affecting the decline of oak forests in Ilam province, information source and fuzzy membership function.

Fig. 2
Standardised maps of effective parameters in oak decline.
1 – precipitation, 2 – temperature, 3 – distance from farmland, 4 – distance from streams, 5 – slopes, 6 – altitude, 7 – aspect, 8 – distance from roads, 9 – forest density.

Fig. 3
Final map of areas with susceptibility to oak in Ilam forests and classification area.