بازسازی دمای میانگین ژانویه- مارس با پهنای دوایر درختان ارس در شرق استان لرستان

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانش‌آموختۀ کارشناسی ارشد هواشناسی کشاورزی، گروه مهندسی آب، دانشکدۀ مهندسی زراعی، دانشگاه علوم کشاورزی و منابع طبیعی ساری، ساری

2 استاد گروه علوم و صنایع چوب و کاغذ، دانشکدۀ منابع طبیعی دانشگاه تهران، کرج

3 استاد گروه مهندسی آب، دانشکدۀ مهندسی زراعی دانشگاه علوم کشاورزی و منابع طبیعی ساری، ساری

4 استادیار گروه مهندسی آب، دانشکدۀ مهندسی زراعی دانشگاه علوم کشاورزی و منابع طبیعی ساری، ساری

10.22034/ijf.2022.327168.1843

چکیده

تحلیل نوسان‌های دمای هوا برای برنامه‌ریزی‌های کشاورزی و بررسی‌های محیطی بسیار باارزش است. با توجه به گرمایش اخیر جهانی در مناطق مختلف، دسترسی به داده‌های درازمدت دما بیش از پیش دارای اهمیت است. اقلیم‌شناسی درختی از ابزارهای موجود برای بررسی درازمدت آب‌وهواست. در این پژوهش پس از توسعۀ گاه‌شناسی درختان ارس رویشگاه کیگوران (شهرستان الیگودرز، استان لرستان) میانگین دمای رویشگاه بازسازی شد. برای این منظور، همبستگی پهنای دوایر سالانۀ درختان با داده‌های هواشناسی ایستگاهی بررسی شد. یافته‌های این پژوهش بیانگر همبستگی مثبت و معنادار میانگین دمای ژانویه- مارس با رشد حلقه‌های سالانه درختان است؛ ازاین‌رو میانگین دمای ژانویه- مارس بازۀ سال‌های 2014-1910 میلادی برای این منطقه بازسازی شد. نتایج بیانگر رخداد سال‌های سرد در اوایل دهۀ 1910 تا نیمۀ نخست دهۀ 1960 است. دوره‌های گرم از نیمۀ دوم 1960 به بعد رخ داده‌اند. به‌طور کلی روند دما در سال‌های اخیر افزایشی بوده است. بررسی سال‌های نمادین مثبت و منفی نیز نشان می‌دهد که بیشتر سال‌های نمادین مثبت در نیمۀ دوم سده بیستم رخ داده‌اند.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Reconstruction of Jan-Mar mean temperature using tree ring widths of Juniper trees in the east of Lorestan province

نویسندگان [English]

  • M Alipoorfard 1
  • K Pourtahmasi 2
  • M Raeini Sarjaz 3
  • M Nadi 4
1 MSc. Graduated of Agrometeorology, Dept. of water engineering, Faculty of Agricultural Engineering, Sari Agricultural sciences and Natural Resources University, Sari, I. R. Iran
2 Prof., Dept. of Wood and Paper Science and Technology, Faculty of Natural Resources, University of Tehran, Karaj, I. R. Iran
3 Prof., Dept. of water engineering, Faculty of Agricultural Engineering, Sari Agricultural sciences and Natural Resources University, Sari, I. R. Iran
4 4Assistant Prof., Dept. of water engineering, Faculty of Agricultural Engineering, Sari Agricultural sciences and Natural Resources University, Sari, I. R. Iran
چکیده [English]

The study of temperature fluctuations is essential for agricultural planning and environmental studies. With global warming affecting various regions, access to long-term temperature data is becoming increasingly important. Dendroclimatology is a useful tool for long-term climate study, and in this study, the average habitat temperature was reconstructed after developing the chronology of Juniperus polycarpus trees in Keygoran site (Aligodarz, Lorestan). The correlation of annual tree rings with climatic variables of meteorological stations was investigated to reconstruct the average temperature in January-March for the period 1910-2014 for this region. The findings show a positive and significant correlation between the average January-March temperature and the growth of annual tree rings. The results show the occurrence of cold years in the first years of the 1910s to the first half of the 1960s. Warm periods have occurred since the second half of the 1960s, and the temperature trend has generally been increasing in recent years. An examination of the positive and negative pointer years also shows that most of the positive pointer years occurred in the second half of the twentieth century.

کلیدواژه‌ها [English]

  • Average temperature
  • Dendroclimatology
  • Global warming
  • Temperature reconstruction
 
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