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تأثیر عامل های طبیعی و انسانی بر تغییر خطی و غیرخطی پوشش گیاهی با تصویرهای ماهواره یی در آبخیز خور- سفیدارک، استان البرز | ||
| پژوهش های آبخیزداری | ||
| مقاله 7، دوره 34، شماره 3 - شماره پیاپی 132، مهر 1400، صفحه 95-114 اصل مقاله (2.27 M) | ||
| نوع مقاله: پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22092/wmej.2021.352457.1370 | ||
| نویسندگان | ||
| مجید کاظم زاده* 1؛ زهرا نوری1؛ اصغر بیات2؛ سلما ساعدی فرکوش3؛ علی اصغر الیاسی4؛ حسن علی پور5؛ علیرضا منصور فلاح6 | ||
| 1دکترای علوم و مهندسی آبخیز- آب، دانشکده منابع طبیعی، دانشگاه تهران | ||
| 2کارشناس ارشد مهندسی آبخیزداری، دانشکده منابع طبیعی، دانشگاه تهران | ||
| 3کارشناس ارشد توسعه روستایی، دانشکده کشاورزی، دانشگاه رازی، کرمانشاه | ||
| 4کارشناسارشد مهندسی محیط زیست- آب و فاضلاب، دانشکده منابع طبیعی دانشگاه آزاد اسلامی واحد بندرعباس | ||
| 5کارشناس ارشد مهندسی آبخیزداری دانشکده منابع طبیعی دانشگاه تهران | ||
| 6کارشناس مهندسی عمران- آب دانشکده فنی و مهندسی دانشگاه آزاد اسلامی واحد کرج | ||
| چکیده | ||
| هدف از این پژوهش بررسی روند تغییر خطی و غیرخطی پوشش گیاهی بر اثر عامل های اقلیمی (بارش، دما و خشکسالی) و انسانی (اقدامهای زیستی آبخیزداری) با تصویرهای ماهواره یی در بازه ی زمانی 20 سال (2000-2019) در آبخیز خور-سفیدارک استان البرز است. شاخص پوشش گیاهی، شاخص خشکسالی و الگوریتم پلیترند با استخراج دورههای زمانی ماهانه بهکاربرده شد. با کاربرد دادههای اقلیمی و اطلاعات اقدامهای آبخیزداری اجراشده، تأثیر عامل های طبیعی (دما، بارش و خشکسالی) و انسانی بر تغییر پوشش گیاهی ارزیابی شد. نتایج نشان داد که در 20 سال گذشته تغییر در 35 % از پوشش گیاهی آبخیز معنیدار (92/6 % افزایشی و 7/4 % کاهشی)، و در 65 % آبخیز نا معنیدار بود. نتیجهها نشان داد که 87/71 % از تغییر پوشش گیاهی منطقه از نوع خطی، و بهترتیب 6/62 % و 5/68 % از تغییر مانده غیرخطی درجهی دو و سه بود. بررسی تأثیر دما و بارش بر پوشش گیاهی نشان داد که بارش منطقه روند معنیداری در دو دهه نداشت، اما روند دما کاهشی معنیدار بود. ارزیابی تأثیر خشکسالی بر تغییر پوشش گیاهی نشان داد که بیشترین کاهش در پوشش گیاهی در سال 2008 اتفاق افتاد، که بر اثر خشکسالی شدید اقلیمی بود. نتیجه اینکه هر چند تغییر پوشش گیاهی در درازمدت بر اثر عامل های اقلیمی نبود، تغییر کوتاه مدت رویدادهای جدی از جمله خشکسالی، بهروشنی تغییر پوشش گیاهی منطقه را توضیح می دهد. از طرف دیگر، نتایج نشان داد که اقدامهای آبخیزداری باعث ایجاد تغییر با الگوی خطی، و تغییر و گسترش منطقههای مسکونی (عامل انسانی) باعث ایجاد الگوی غیرخطی در پوشش گیاهی شد. علت آن این است که اقدامهای زیستی آبخیزداری به شکل خطی و تدریجی باعث افزایش و تقویت پوشش گیاهی منطقه شد، اما تغییر و گسترش زمین منطقههای روستایی باعث کاهش غیرخطی (تغییر ناگهانی و نا تدریجی) پوشش گیاهی شد. | ||
| کلیدواژهها | ||
| اقدامهای آبخیزداری؛ پوشش گیاهی؛ خشک سالی؛ سنجش از دور؛ عامل های طبیعی و انسانی | ||
| عنوان مقاله [English] | ||
| An Evaluation of the Effect of Natural and Human Factors on the Linear and Non-linear Changes in Vegetation Using the Landsat Images of the Khor-Sefidarak Watershed, the Province of Alborz | ||
| نویسندگان [English] | ||
| Majid Kazemzadeh1؛ Zahra Noori1؛ Asghar Bayat2؛ Salma Saedi Farkoush3؛ Ali Asghar Elyasi4؛ Hasan Alipour5؛ Alireza Mansour Fallah6 | ||
| 1Ph.D. in Watershed Science and Engineering, Faculty of Natural Resources, University of Tehran | ||
| 2Graduate of Master of Science in Watershed Engineering, Faculty of Natural Resources, University of Tehran | ||
| 3Graduate of Master of Science in Rural Development from Faculty of Agriculture, Razi University of Kermanshah | ||
| 4Graduate of Master of Science in Environmental Engineering - Water and Wastewater, Faculty of Natural Resources, Islamic Azad University, Bandar Abbas Branch | ||
| 5Graduate of Master of Science in Watershed Engineering, Faculty of Natural Resources, University of Tehran | ||
| 6Graduate of Civil Engineering - Water, Faculty of Engineering, Islamic Azad University, Karaj Branch | ||
| چکیده [English] | ||
| The aim of current study was to study the trend of linear and non-linear changes in vegetation cover under the influences of climatic factors (rainfall, temperature and drought) and human activity (biological watershed management measures) using satellite images over a period of 20 years (2000-2019) on the Khor-Sefidarak Watershed, the Province of Alborz. Vegetation index (NDVI), drought index (SPI) and PolyTrend algorithm were used by extracting the monthly time series. Then, using climatic and implemented watershed management measures data for the basin, the impact of natural (temperature, precipitation and drought) and human factors on vegetation changes was assessed. The results indicated that 35% of the area had significant changes (92.6% increasing and 7.4% decreasing) in vegetation, and 65% of the area had insignificant changes during the last 20 years. The results also indicated that 87.71% of the vegetation changes in the region had experienced a linear type change and the remaining 6.62 and 5.68% haddemonstrated second and third degree nonlinear changes, respectively. Considering the effects of the two climatic variables on vegetation, precipitation did not show a significant trend over the two decades; however the temperature indicated a significant decreasing trend. Assessing the impact of drought on vegetation change, the largest decline in vegetative cover occurred in 2008, which was strongly influenced by severe climatic drought. Although the vegetation changes have not been affected by climatic factors in the long term, short-term changes in extreme events, including drought, strongly justify changes in the region's vegetation. On the other hand, the results indicated that the watershed management measures have caused changes with a linear pattern; however, the changes and expansion of the residential areas (as human factors) have caused a nonlinear pattern in vegetation. Thus the biological watershed management measures have increased and strengthened the vegetation of the region linearly; however, sudden and rapid changes in the rural areas have caused a non-linear decrease in vegetation. | ||
| کلیدواژهها [English] | ||
| Drought, natural and human factors, remote sensing, vegetation, watershed management measures | ||
| مراجع | ||
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