تعیین مهمترین عوامل تأثیرگذار روی خشکیدگی گونه .Quercus brantii Lindl با استفاده از مدل Maxent

Zagros forests are one of the most important forest ecosystems in Iran. They play the important role in conserving water and soil resources and also in modulating climatic factors. These forests are classified as semi-arid forests, with an area of 5 million hectares which covered about 40% of forests in Iran. Recently in many trees of the Zagros forests has increased Oak decline disease. Researchers have also shown that oak decline in Zagros forest began in 2008 and various factors including climatic factors, pests and plant diseases and forest factors have caused oak decline to happen. In this study, the most important factors affecting on Persian Oak decline were investigated (Quercus brantii Lindl.) using Maxent model in Lorestan Province. The first, 22 bioclimatic and topographic variables were prepared in ArcGIS 10.4.1 software and converted to ASCII format for use in Maxent 3.3.3 software. The layer related to the presence of oak decline was extracted from the geographical distribution map of Persian Oak decline using 1.5 × 1.5 km network and prepared at CSV format for using in Maxent 3.3.3 software. The results showed that among the 22 influential variables, three variables including annual mean temperature (Bio1= 43.6%), min temperature of coldest month (Bio6= 18.9%) and precipitation seasonality (Bio15= 9.5%) were more important than others on Persian Oak decline. It seems that climate changes, spatially decrease in precipitation from the 2008s and the overall rise in temperature caused weakness in Persian Oak and prepared the situation for invading of fungous diseases caused by Biscoigiauxia mediterranea and Persian Oak decline.