Correlation of physiographic, human and climate factors with spatial distribution of Quercus brantii - Pistacia atlantica type in Sarvabad, Kurdistan province

This research was carried out to study the relationship of physiographic، climatic and human factors with the spatial distribution of Quercus brantii – Pistacia atlantica type. Quercus brantii – Pistacia atlantica type map was prepared based on existing maps and edited by field surveying in 11336 hectares of Sarvabad forests. Physiographic attribute (elevation، slope، aspect and distance from streams) and human factor map (distance from residential) were derived from the topographic and landuse maps، respectively. Climate factors maps (temperature and rain) were produced based on the records of 5 years meteorological bureau. Logistic Regression was used to select the most important effective factors in presence of Q. brantii – P. atlantica type and to model it. The results showed that the spatial distribution of Q. brantii – P. atlantica type is a function of altitude، aspect، slope، distance from streams and rainfall. Increasing of altitude، moving from wet slopes to dry slopes، reducing the distance from streams and reducing of rainfall are caused more presence of Q. brantii – P. atlantica type. According to regression analysis، some factors such as distance from residential and temperature are less effective than other studied factors on the presence of Q brantii – P. atlantica type. The results showed that 95% of Q. brantii – P. atlantica type are in the class above 50% of probability.