پژوهش های اقلیم شناسی

پژوهش های اقلیم شناسی

کاربرد‌ ‌روش های‌رادیوگرافی‌وعکس‌برداری دراندازه‌گیری پهنای دوایرسالیانه‌درخت‌زربینCupressus Sempervirens L.var.horizontalis) )

نوع مقاله : مقاله پژوهشی

نویسندگان
جواد ترکمن 1
مهرداد قدسخواه دریایی 1
نسرین آهوقلندری 2
1 دانشیار گروه جنگلداری دانشکده منابع طبیعی دانشگاه گیلان ،ایران
2 دانش آموخته دکترای جنگلداری پردیس دانشگاه گیلان،ایران
10.22034/jcr.2024.196362
چکیده
مقدمه:‌گونه‌های مختلف‌‌‌‌گیاهی به‌خصوص‌درختان درطول‌حیاتشان نسبت به‌تغییرات عوامل اقلیمی واکنش نشان می دهند.علمی که به بازسازی عوامل اقلیمی گذشته از روی دوایرسالیانه درختان می پردازد را علم گاهشناسی درختی گویند. دراین علم‌ شاخص ‌انطباق زمانی دوایر و تشخیص دوایرسالیانه حقیقی از دوایر کاذب و اندازه گیری دقیق پهنای دوایرسالیانه اهمیت بسیاری دارد.

هدف پژوهش کاهش خطاو افزایش دقت اندازه‌گیری پهنای‌ دوایر‌سالیانه ازطریق انتخاب مناسبترین روش اندازه‌گیری می‌باشد برای این منظور از دو روش رادیوگرافی بااشعه ایکس و روش عکس‌برداری برای اندازه گیری پهنای دوایر‌سالیانه درخت زربین در منطقه رودبار استفاده شده است.

موادوروشها:درمنطقه مورد مطالعه رودبار بصورت گزینشی تعداد 5 اصله درخت زربین انتخاب شد. دیسک‌های مناسب و موردنیاز درارتفاع برابرسینه درخت برش داده شد. برای آشکارسازی دوایرسالیانه ازتیغه وسمباده کاغذی استفاده شد. درروش عکس‌برداری برای اندازه گیری پهنای دوایرسالیانه ازتصاویر گرفته شده توسط دوربین عکاسی و. در روش رادیوگرافی از تصاویر گرفته شده توسط اشعه ایکس استفاده‌ شد. اندازه گیری پهنای-دوایرسالیانه برحسب میلیمتر بوسیله نرم افزار دیجی‌مایزر انجام شده است.

نتایج: با توجه به پارامترهای بدست آمده نتایج نشان داد که میزان تطابق زمانی تشکیل دوایرسالیانه در روش رادیوگرافی 95 درصد و در روش عکس‌برداری 70 درصد است. که نشان دهنده دقت بیشتر روش‌ رادیوگرافی در مقایسه با روش عکس‌برداری است. همبستگی ‌بالای ‌روش ‌رادیوگرافی‌(r=0.75) نسبت ‌به عکاس‌برداری (r=0.40) درسطح ‌اطمینان95درصد با منحنی‌کرونولوژی ‌‌نشانه ‌مناسب ‌بودن ‌این ‌روش‌ است.

به‌طورکلی لازمه تشخیص دقیق تغیرات عوامل اقلیمی در‌گذشته از‌روی مشخصات پهنای دوایر سالیانه درختان ،داشتن اطلاعات درست است که بستگی به روش اندازه گیری دارد .دراین پژوهش با توجه به پارامترهای گاهشناسی بدست آمده و مقایسه نتایج اندازه گیری پهنای دوایر سالیانه درخت زربین در هردو روش عکسبرداری و رادیوگرافی، بهترین روش رادیوگرافی با اشعه ایکس تشخیص داده شد. مشگل ‌این ‌روش‌هزینه‌ بالای ‌آن ‌در مقایسه ‌با ‌روش ‌عکس‌برداری‌ است.که ‌با توجه ‌به ‌دقت ‌موردنیاز درعلم ‌گاهشناسی ‌مقرون به‌صرفه -است..
کلیدواژه‌ها
کلمات کلیدی: زربین
گاه شناسی
رادیوگرافی اشعه ایکس
کرونولوژی

عنوان مقاله English

Application of Radiography and Photography methods for measuring the width of the cypress tree annual rings (Cupressus Sempervirens L.var.horizontalis)

نویسندگان English

javad torkaman 1
mehrdad daryaei 1
nasrin ahooghalandari 2
2 university of guilan
چکیده English

Abstract

Different plant species, especially trees, react to the changes of climatic factors during their life.The science that deals with the reconstruction of past climatic factors based on the annual rings of trees is called dendrochronology. In this science, the temporal adaptation of rings and distinguishing true annual rings from false rings is important.The aim of this research is to reduce the error of measuring the annual growth ring width. In order to detect the real annual rings, the X-ray radiography method was used in comparison with the usual method of measuring the annual growth ring width of the cypress tree in the Rudbar region.The annual ring width was measured with an accuracy of 0.01 mm using the Miniviwer software.The results after time adaptation and standardization were compared with the results of the usual method. The results showed that the matching rate (GLK) in the radiographic method is 95% and in the conventional method is 70%. which shows the greater accuracy of this method compared to the usual method of measuring the ring growth width of the cypress tree. The correlation of the chronology obtained from radiographic measurements with precipitation and temperature changes is higher than the chronology obtained from the data obtained by the usual method.

Keywords: Cypress, X-ray radiography, Dendrochronology

Abstract

Different plant species, especially trees, react to the changes of climatic factors during their life.The science that deals with the reconstruction of past climatic factors based on the annual rings of trees is called dendrochronology. In this science, the temporal adaptation of rings and distinguishing true annual rings from false rings is important.The aim of this research is to reduce the error of measuring the annual growth ring width. In order to detect the real annual rings, the X-ray radiography method was used in comparison with the usual method of measuring the annual growth ring width of the cypress tree in the Rudbar region.The annual ring width was measured with an accuracy of 0.01 mm using the Miniviwer software.The results after time adaptation and standardization were compared with the results of the usual method. The results showed that the matching rate (GLK) in the radiographic method is 95% and in the conventional method is 70%. which shows the greater accuracy of this method compared to the usual method of measuring the ring growth width of the cypress tree. The correlation of the chronology obtained from radiographic measurements with precipitation and temperature changes is higher than the chronology obtained from the data obtained by the usual method.

Keywords: Cypress, X-ray radiography, Dendrochronology

Abstract

Different plant species, especially trees, react to the changes of climatic factors during their life.The science that deals with the reconstruction of past climatic factors based on the annual rings of trees is called dendrochronology. In this science, the temporal adaptation of rings and distinguishing true annual rings from false rings is important.The aim of this research is to reduce the error of measuring the annual growth ring width. In order to detect the real annual rings, the X-ray radiography method was used in comparison with the usual method of measuring the annual growth ring width of the cypress tree in the Rudbar region.The annual ring width was measured with an accuracy of 0.01 mm using the Miniviwer software.The results after time adaptation and standardization were compared with the results of the usual method. The results showed that the matching rate (GLK) in the radiographic method is 95% and in the conventional method is 70%. which shows the greater accuracy of this method compared to the usual method of measuring the ring growth width of the cypress tree. The correlation of the chronology obtained from radiographic measurements with precipitation and temperature changes is higher than the chronology obtained from the data obtained by the usual method.

Keywords: Cypress, X-ray radiography, Dendrochronology

Abstract

Different plant species, especially trees, react to the changes of climatic factors during their life.The science that deals with the reconstruction of past climatic factors based on the annual rings of trees is called dendrochronology. In this science, the temporal adaptation of rings and distinguishing true annual rings from false rings is important.The aim of this research is to reduce the error of measuring the annual growth ring width. In order to detect the real annual rings, the X-ray radiography method was used in comparison with the usual method of measuring the annual growth ring width of the cypress tree in the Rudbar region.The annual ring width was measured with an accuracy of 0.01 mm using the Miniviwer software.The results after time adaptation and standardization were compared with the results of the usual method. The results showed that the matching rate (GLK) in the radiographic method is 95% and in the conventional method is 70%. which shows the greater accuracy of this method compared to the usual method of measuring the ring growth width of the cypress tree. The correlation of the chronology obtained from radiographic measurements with precipitation and temperature changes is higher than the chronology obtained from the data obtained by the usual method.

Keywords: Cypress, X-ray radiography, Dendrochronology

کلیدواژه‌ها English

Keywords: Cypress
X-ray radiography
Dendrochronology
  1. Balapour,Sh.,Jalilvand,H., Raeini, M., and Asadpour, H ,2010, Relationship between tree rings of Beech (Fagus orientalis) with some climatic variables in experimental  forest of Natural Resources Faculty (Darabcola). Watershed Management Research Journal(Pajouhesh & Sazandegi), 88: 1-10. (In Persian).
  2. Kazemi, S.M., Asadpour, H and. Balapour Sh,2012, Investigation on relationship between tree rings of Cupressus sempervirens l . var .horizantalis and climatic variables, Iranian Journal of Wood and Paper Science Research Vol.27 No. (2),361-371.
  3. Mehrabi, S,2013,The use of X-ray method to study annual growth variation  of Pinus eldarica, Iranian Journal of Wood and Paper Science Research Vol.28 No. (2):341-353. DOI:http://dx.doi.org/10.22092/ijwpr.2013.2949
  4. Bill, J., Daly, A., Johnsen, Ø., Dalen,K.S,2012,DendroCT  Dendrochronology without damage,Dendrochronologia 30(3): 223-230.
  5. Creasman, P.P,2011, Basic principles and methods of dendrochronological specimen curation, Tree-Ring Research 67(2): 103-115.
  6. Grabner, M., Salaberger, D., Okochi, T,2009,The need of high resolution μ-X-ray CT in dendrochronology and in wood identification. In: Proceedings of 6th International Symposium on Image and Signal Processing and Analysis. Pp 349-352.
  7. Jones, F. W., and. Parker, M. L.1970, G. S. C. tree -ring scanning densitometer and data acquisition system. Tree -Ring Bulletin, Vol. 30 Nos. 1 -4.
  8. Mannes D, Lehmann E, Cherubini P, Niemz P,2007, Neutron imaging versus standard X-ray densitometry as method to measure tree-ring wood density. Trees 21: 605–612.
  9. Nasswettrová, A., Křivánková, S., Šmíra, P., Sanace S.R.O, 2017, Comparison Of The Results Of Dendrochronological Measuring Based On Different Images Of A Historical Wood Sample Of Silver Fir (Abies Alba) From The Czech Republic. Wood Research 62 (1): 113-124.
  10. Okochi, T., Hoshino, Y., Fujii, H., Mitsutani, T, 2007, Nondestructive tree-ring measurements for Japanese oak and Japanese beech using micro-focus X-ray computed tomography, Dendrochronologia 24(2-3): 155-164.
  11. Parsapajuoh,D,1971,Identification of wood by radiographic method, Journal of Forestry, No. 25, Faculty of Natural Resources, Tehran University, pp 1-22.
  12. Parsapajouh,D,1984,Wood Technology,Tehran University Publications.pp.66-86.
  13. Parker,M.L., Meleskie, K.R,1970, Preparation of X-ray negatives of tree-ring specimens for dendrochronological analysis. Tree-Ring Bulletin 30:11-22.
  14. Polge,H,1970,The use of X-ray densitometric methods in dendrochonology. Tree-Ring Bulletin 30: 1–10.
پژوهش های اقلیم شناسی
دوره 1403، شماره 57 - شماره پیاپی 57
سال پانزدهم | شماره 57| بهار 1403
پاییز 1403
صفحه 173-180