Investigation on poplar cultivated area change by aerial photographs and land control

In order to study the cultivated area change of poplar at Zanjan-Roud district and its economical and social reasons, the aerial photographs of the district in 1978 were studied then the change after 15 years (1993) was checked by land control and observation. The results showed that during that period of time the cultivated area decreased by 22 percent. Cultivated area was estimated by point sampling method. Overall, poplar farms were replaced with other agricultural crops by people and subsequently soil erosion has been increased.