واکاوی ارتباط بین تغییرات پوشش گیاهی و لندفرمهای بیابانی در شمال استان اصفهان | ||
| خشک بوم | ||
| دوره 13، شماره 1، اردیبهشت 1402، صفحه 65-82 اصل مقاله (2.24 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.29252/aridbiom.2023.20350.1944 | ||
| نویسندگان | ||
| جعفر گنجعلی1؛ امیرحسین حلبیان* 2؛ امیر کرم3؛ شیلا حجهفروشنیا4 | ||
| 1عضو هیات علمی، گروه جغرافیا، دانشگاه پیام نور، تهران، ایران | ||
| 2دانشیار، گروه جغرافیا، دانشگاه پیام نور، تهران، ایران | ||
| 3دانشیار، گروه جغرافیای طبیعی، دانشگاه خوارزمی، تهران، ایران | ||
| 4استادیار، مرکز تحقیقات، آموزش کشاورزی و منابع طبیعی استان اصفهان، سازمان تحقیقات، آموزش و ترویج کشاورزی، تهران، ایران | ||
| چکیده | ||
| هدف از این پژوهش واکاوی تغییرات پوشش گیاهی در لندفرمهای بیابانی شمال استان اصفهان با استفاده از دادههای ماهوارهای لندست 5 و 8، سنجندههای TM و OLI-TIRS در دوره 2020-1987 است. در این راستا، 200 تصویر در 27 ماه گرم سال (از اول ژوئن تا آخر آگوست، برابر با اوایل خرداد تا اوایل شهریور) اخذ شد. پس از پیشپردازشهای لازم روی تصاویر پوششدهنده محدوده مورد بررسی و با طبقهبندی لندفرمهای زمین بر اساس نمایه موقعیت توپوگرافی Topographic Position Index (TPI)، نمایه پوشش گیاهی NVDI مورد واکاوی قرار گرفت. نتایج نشان میدهد که الگوی تغییرات پوشش گیاهی از پهنههای کوهستانی به سوی مناطق هموار نزولی است. بررسی شرایط پوشش گیاهی در لندفرمهای حاصل از TPI نشان داد که بیشینه مقادیر NDVI مربوط به واحد برآمدگیها، کوهها و ارتفاعات و کمینه مقادیر آن متعلق به واحد دشتهای هموار (پلایاها، کفههای گلی و رسی) است. در مجموع، مقادیر NDVI از لندفرم کوهستان به سوی پلایاها و چالهها روندی کاهشی دارد. اُفت چشمگیر NDVI در ارتفاع 1400 متری (دشتسرهای میانی) آشکار است. در لندفرم کوهستان (ارتفاعات بالاتر از 1400 متر) مقادیر NDVI افزایش مییابد. در شیبهای بیشتر از 65 درجه (زمینهای سنگلاخی و صخرهای مرتفع) روند کاهشی NDVI تشدید شده است. نمایه NDVI چهار فاز تغییرات را نیز آشکار کرد که فاز چهارم از 2020-2014 دارای روند کاهشی بوده و مساحت این نمایه از 34380 کیلومتر مربع به 34200 کیلومتر مربع کاهش یافته است. تغییرات فضایی نمایه NVDI در سال 2030 آشکار ساخت که ارتفاعات کرکس تا مارشنان و پهنههای بین کاشان تا اردستان دچار شرایط بحرانی خواهند شد؛ این مسئله نیازمند توجه ویژه مسئولان و مدیران اجرایی مربوطه در این زمینه است. | ||
| کلیدواژهها | ||
| نمایه پوشش گیاهی NVDI؛ نمایه موقعیت توپوگرافی (TPI)؛ عوامل فیزیوگرافی؛ شکل زمین | ||
| عنوان مقاله [English] | ||
| Analysis of vegetation changes related to desert landforms in the northern Isfahan province | ||
| نویسندگان [English] | ||
| Jafar Ganjali1؛ Amirhossein Halabian2؛ Amir Karam3؛ Shila Hajehforoshnia4 | ||
| 1Faculty member, Department of Geography, Payame Noor University, Tehran, Iran | ||
| 2Associate professor, Department of Geography, Payame Noor University, Tehran, Iran | ||
| 3Associate professor, Physical Geography Department, Kharazmi University, Tehran, Iran | ||
| 4Assistant Professor, Department of Natural Resources Research, Isfahan Agricultural and Natural Resources Research and Education Center (AREEO), Tehran, Iran | ||
| چکیده [English] | ||
| This research aims to analyze vegetation changes in desert landforms in the northern region of Isfahan province using Landsat images 5 and 8, specifically TM5 and OLI-TIRS sensors, from 1987 to 2020. For this purpose, 200 images were extracted during the 27 warm months, from June 1 to the end of August. After performing the necessary pre-processing on the images that cover the study region, the landforms were classified using the Topographic Position Index (TPI). Subsequently, the NDVI index was analyzed. The results showed that the pattern of vegetation changes from mountainous areas to lowlands is downward. The analysis of the vegetation index on different landforms, as extracted from the TPI, revealed that the unit of mountains and heights exhibited the highest values, while flat plains such as playas, mud, and clay pans had the lowest values. In general, NDVI values have a decreasing trend from mountain landforms to playas, mud, and clay pans. A significant decrease in NDVI is evident at an altitude of 1400 m (middle pediments). NDVI values increase in mountainous landforms (elevations above 1400 m). On slopes greater than 65° (high stony and rocky lands), the decreasing trend of NDVI has intensified. The NDVI index illustrates four phases of change. The fourth phase, which spanned from 2014 to 2020, exhibited a decreasing trend. During this period, the area covered by this index decreased from 34,380 km² to 34,200 km². The spatial changes of the NDVI index in 2030 indicate that the elevations from Karkas to Marshenan and the areas between Kashan and Ardestan will experience critical conditions. This issue requires the special attention of relevant officials and executives in this field. | ||
| کلیدواژهها [English] | ||
| NDVI index, TPI index, Physiographic factors, Landform | ||
| مراجع | ||
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