ارزیابی ساختار و عملکرد چشم‌انداز‌های بیابانی با استفاده از تحلیل عملکرد چشم‌انداز و شاخص‌های سنجش از دوری | ||
| خشک بوم | ||
| دوره 12، شماره 1، اردیبهشت 1401، صفحه 49-62 اصل مقاله (1.45 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.29252/aridbiom.2023.19284.1910 | ||
| نویسندگان | ||
| سیدمهدی امیرآبادی‌زاده1؛ حسین بشری* 2؛ رضا جعفری2 | ||
| 1دانش‌آموخته کارشناسی‌ارشد دانشکده منابع طبیعی دانشگاه صنعتی اصفهان، اصفهان، ایران | ||
| 2دانشیار، گروه مرتع و آبخیزداری، دانشکده منابع طبیعی، دانشگاه صنعتی اصفهان، اصفهان، ایران | ||
| چکیده | ||
| در این مطالعه، ساختار و عملکرد مناطق اطراف تالاب بین‌المللی گاوخونی با کلاس‌های مختلف بیابانزایی با استفاده از روش تحلیل عملکرد چشم‌انداز (LFA) و شاخص نشت جهتدار گیاهی (CDLI) مستخرج از سنجنده OLI لندست 8 و شاخص‌های گیاهی NDVI، SAVI-A، PD54 و STVI-1 ارزیابی و مقایسه گردید. در این تحقیق، 6 مکان مختلف انتخاب و در هر مکان، تعداد دو تا سه ترانسکت 50 متری مستقر شد. طول و عرض لکه‌‌‌ها و فضای بین‌لکه‌ای به‌طور ممتد اندازه‌گیری و تعداد 11 شاخص سطحی در تمام لکه‌های اکولوژیک و فضای بین‌لکه‌ها با سه تکرار ارزیابی گردید. نتایج نشان داد که معیار‌های عملکردی پایداری و عناصر غذایی اختلاف معنیداری در میان مکان‌های مطالعاتی نداشت ولی شاخص چرخه موادغذایی در مکان‌های تاغ‌کاری‌شده (Haloxylon ammodendron)، اشنانزار (Seidlitzia rosamrinus) و گَنگزار (Halocnmum strobilcaum) در مقایسه با سایر مکان‌ها در سطح 5 درصد اختلاف معنیدار داشت. شاخص‌های ساختاری و عملکردی در مناطق با کلاس‌های مختلف بیابانزایی در سطح آماری 5 درصد با یکدیگر اختلاف معنیدار نداشتند. شاخص PD54 به علت تمایز بهتر میزان نشت منابع میان مکان‌های مختلف، بهترین عملکرد را داشت و یک رابطة قوی بین این شاخص و شاخص نشت جهتدار گیاهی وجود داشت (%9/71=R2). همچنین رابطة منفی و معنیداری در سطح 5 درصد بین میزان نشت و درصد پوشش وجود داشت. مطالعه حاضر نشان داد که تلفیق روش LFA و شاخص نشت CDLI می‌تواند بطور مناسبی شرایط ساختاری و عملکردی اکوسیستمهای مناطق بیابانی را ارزیابی کند. | ||
| کلیدواژه‌ها | ||
| اکوسیستم بیابانی؛ پایداری؛ نفوذپذیری؛ چرخه مواد غذایی؛ لکه اکولوژیک؛ شاخص‌های سنجش از دوری | ||
| عنوان مقاله [English] | ||
| Evaluating structure and function of desert landscapes using Landscape Function Analysis and remote sensing indices | ||
| نویسندگان [English] | ||
| Seyed Mehdi Amirabadizadeh1؛ Hossein Bashari2؛ Reza Jafari2 | ||
| 1Graduate of Desertification, Department of Natural Resources, Isfahan University of Technology, Isfahan, Iran | ||
| 2Associate Professor, Department of Natural Resources, Isfahan University of Technology, Isfahan, Iran | ||
| چکیده [English] | ||
| This study aimed to evaluate and compare the structure and function status of some areas with different desertification classes around Gavkhoni International Wetland using Landscape Function Analysis (LFA), and Cover Directional Leakiness Index (CDLI) extracted from Landsat 8 OLI sensor and NDVI, SAVI-A, PD54, and STVI-1 vegetation indices. In this research, six different areas were selected, and two or three transects with a length of 50 meters were established in each area. The length and width of the patches and inter-patches were continuously measured. Then 11 soil surface indicators were assessed in all ecological patches, and inter-patch areas with three replications. The results showed that although range places did not differ significantly in terms of soil stability and nutrient cycling indices, the infiltration index in the areas covered by Haloxylon ammodendron, Seidlitzia rosmarinus and Halocnemum strobilaceum varied significantly compared with the other areas (p < 0.05). According to the results, there were no significant differences between the structure and function indices in the areas with various desertification classes (p > 0.05). The PD54 index showed the best performance among vegetation indices due to its better differentiation of resource leakage between different areas, and it had a high relationship with CDLI (R2 = 71.9 %). There was a negative correlation between CDLI and vegetation cover percentage (p < 0.05). The present study indicated that integrating the results of LFA method with CDLI can be used to evaluate the structure and function status of desert ecosystems appropriately. | ||
| کلیدواژه‌ها [English] | ||
| Desert ecosystem, Stability, Infiltration, Nutrient cycling, Ecological patch, Remote sensing indices | ||
| مراجع | ||
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