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پایش خشکسالی در دو قرن اخیر در مناطق خشک و نیمهخشک با استفاده از گاهشناختی درختی، مطالعه موردی حوضه کرخه | ||
تحقیقات آب و خاک ایران | ||
مقاله 4، دوره 48، شماره 2، مرداد 1396، صفحه 263-273 اصل مقاله (614.48 K) | ||
نوع مقاله: مقاله پژوهشی | ||
شناسه دیجیتال (DOI): 10.22059/ijswr.2017.62619 | ||
نویسندگان | ||
فرید فروغی* 1؛ شهاب عراقی نژاد2؛ قاسم عزیزی3؛ محسن ارسلانی4 | ||
1دانشجوی دکتری پردیس کشاورزی و منابع طبیعی کرج-مربی دانشگاه شیراز | ||
2دانشیار/دانشکده مهندسی و فناوری کشاورزی دانشگاه تهران | ||
3دانشیار / دانشگاه تهران | ||
4دانشجو دکتری/ دانشگاه تهران | ||
چکیده | ||
با اندازهگیری حلقههای رویشی سالیانه درختان و ساخت گاهشناسی از آنها، امکان مطالعه و بازسازی شاخص شدت خشکسالی پالمر در محدوده رویشگاهها فراهم میشود. هدف از انجام این پژوهش، بازسازی شاخص شدت خشکسالی پالمر با استفاده از گاهشناسی درختی و پایش خشکسالی در حوضه کرخه میباشد. در این تحقیق از شاخص گاهشناسی درختی منطقهای زاگرس مرکزی دو گونه درختی، بلوط ایرانی (Quercus brantii) و بلوط مازو (Quercus infectoria) طی دوره 1840-2010 برای بازسازی شاخص شدت خشکسالی پالمر در حوضه کرخه استفاده شده است. با توجه به همبستگی مثبت و معنادار شاخص شدت خشکسالی پالمر با شاخص گاهشناسی درختی منطقهای، مقادیر شاخص شدت خشکسالی پالمر طی سالهای 1840 تا 2010 بازسازی شد. مقادیر محاسباتی شاخص شدت خشکسالی پالمر و مقادیر بازسازیشده آن در دوره آماری مشترک بهخوبی با هم مطابقت دارند. در ادامه وضعیت هیدرولوژیکی در طول دوره گاهشناسی مورد بررسی قرار گرفت و بر این اساس خشکسالی هیدرولوژیکی در حوضه کرخه برای سالهای 1840 تا 2010 بررسی شد. شدت و تداوم خشکسالیها و همچنین دهههایی با بیشترین تعداد رویدادهای خشکسالی و ترسالی تعیین گردید. همچنین نتایج این تحقیق با سایر محققین نیز مقایسه گردید. بر این اساس شدیدترین کمآبی (خشکسالی) در کل دوره بازسازی 1840 تا 2010 برای ایستگاه کاکارضا مربوط به سالهای 2004-1999 بوده است. شدیدترین کم آبی (خشکسالی) بازسازیشده در قرن 19 و 20 به ترتیب در سالهای 1853 تا 1855 و 1966 تا 1968 بوده است. | ||
کلیدواژهها | ||
شاخص شدت خشکسالی پالمر؛ اقلیم شناسی درختی؛ حلقه های درختی؛ پایش خشکسالی؛ حوزه کرخه | ||
عنوان مقاله [English] | ||
Drought monitoring in the last two centuries in the arid and semi-arid reigon using dendrochronology, a Case Study of Karkheh basin | ||
نویسندگان [English] | ||
Farid Foroughi1؛ Shahab Araghinejad2؛ Ghasem Azizi3؛ Mohsen Arsalani4 | ||
1PhD student / Tehran University | ||
2Associate Professor/ Tehran University | ||
3Associate Professor/ Tehran University | ||
4PhD Student /Tehran University | ||
چکیده [English] | ||
Through a measurement of the annual growth of a tree ring and finding out of its chronology, the possibility of study and reconstruction of Palmer Drought Severity Index (PDSI) in the habitat areas is provided. The aim followed in this research is to reconstruct PDSI using dendrochronology, and drought monitoring within Karkheh basin. Throughout the research the chronology index of two tree species, namely Quercus brantii, and Quercus infectoria, in the central Zagross region during the period of 1840-2010 were used to reconstruct Palmer Drought Severity Index in KarkhehBasin. Correlations between Palmer Drought Severity Index and regional chronology index were positive and significant within 1% of confidence level. With regard to this fact, the Palmer Drought Severity Indexes from year 1840 to 2010 were reconstructed. The values of observed vs. reconstructed Palmer Drought Severity Index within the common statistical period are consistent with each other. Within further steps, the hydrological conditions during chronology period were studied and accordingly, hydrological drought was analyzed within the Basin for years, 1840 to 2010. Severity and duration of the droughts as well as decades of the highest number of drought and wet events were determined. In addition, the results were compared with those obtained by other researchers as well. | ||
کلیدواژهها [English] | ||
Palmer Drought Severity Index, Dendroclimatology, tree ring, Drought Monitoring, Karkheh basin | ||
مراجع | ||
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