نوع مقاله : علمی - پژوهشی
نویسندگان
1 استادیار پژوهش، بخش تحقیقات بیابان موسسه تحقیقات جنگلها و مراتع کشور ،سازمان تحقیقات ،آموزش و ترویج کشاورزی ، تهران، ایران.
2 عضو هیئت علمی، بخش تحقیقات جنگل، مؤسسه تحقیقات جنگلها و مراتع کشور، سازمان تحقیقات، آموزش و ترویج کشاورزی، تهران، ایران
چکیده
کلیدواژه‌ها
عنوان مقاله [English]
نویسندگان [English]
Decline and drying due to climate change is a global phenomenon and is not specific to a certain species or location. The phenomenon of oak decline in the Zagros forests is no exception and in addition to other factors has been affected by the phenomenon of climate change. In this study, in order to detect the occurrence of climate change in the ecosystem of Zagros forests of Chaharmahal and Bakhtiari province, cold temperature indicators indicating climate change have been used. Daily climatic data for the statistical period 1991-2019 were extracted daily at the nearest synoptic stations to the deterioration monitoring sites. Daily climatic data for the statistical period 1991-2019 were extracted at the nearest synoptic stations to the decline monitoring sites. Before calculating the indicators, daily input data were examined for quality and homogeneity. And prepared in the desired format to enter the model. ClimPACT software in R2.2 environment was used to run the model. Among the global standard indicators detecting the occurrence of climate change, cold temperature indicators; Two days and two nights consecutive cold, number of frosty days, number of icy days, percentage of cold nights frequency, percentage of cold days frequency, two-day cold period and 6-day cold period were extracted and analyzed. The results showed that all cold indicators of climate change had a significant and decreasing trend and experienced the largest decrease in the last decade, especially in 2017 and 2018. The percentage of decrease in cold night temperature indices is more than daily cold temperature
کلیدواژه‌ها [English]
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