ارزیابی شاخصهای گیاهی برآورد پوشش و تولید گیاهی مراتع مناطق خشک در دوره های رویشی مختلف | ||
| خشک بوم | ||
| مقاله 6، دوره 7، شماره 2، آبان 1396، صفحه 57-71 اصل مقاله (1.25 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.29252/aridbiom.7.2.57 | ||
| نویسندگان | ||
| فاطمه پردل* 1؛ عطاالله ابراهیمی2؛ زهرا عزیزی3 | ||
| 1دانش آموخته کارشناسی ارشد مرتعداری، دانشگاه شهرکرد | ||
| 2دانشیار دانشکده منابع طبیعی و علوم زمین، دانشگاه شهرکرد | ||
| 3استادیار گروه سنجش از دور و GIS، دانشکده منابع طبیعی و محیط زیست، دانشگاه آزاد اسلامی، واحد علوم تحقیقات، تهران | ||
| چکیده | ||
| یکی از کاربردهای مهم سنجش از دور در مدیریت منابع طبیعی، تشخیص و ارزیابی کمی پوشش گیاهی است. هدف این پژوهش بررسی شاخصهای گیاهی حاصل از ماهواره لندست 8 به منظور ارائه مدل برآورد تاج پوشش سبز و تولید گیاهی در مرتع مرجن شهرستان بروجن طی فصل رویش است. به این منظور، در طول ترانسکتی به طول 10 کیلومتر و در فواصل حدود 400-1000متر در 19 محل نمونه برداری (به صورت تصادفی) و در هر نقطه با 5 کوادرات 2Î2 متری به صورت کوادراتی مرکزی و چهار کوادرات در چهار جهت اصلی اطراف آن 95 کوادرات در هر دوره آماربرداری و در طی 4 دوره عملیات صحرایی ً380 کوادرات، بین اردیبهشت تا شهریور سال 1393 اندازهگیریهای متغیرهای تولید (به روش اندازه گیری مضاعف) و پوشش تاجی (به روش پلات مشبک) انجام شد. پس از انجام تصحیح اتمسفری به روش FLAASH، 12 شاخص گیاهی برای تمام تصاویر محاسبه شد. سپس ارزشهای شاخصهای گیاهی در روابط رگرسیونی در برابر ارزشهای زمینی تاج پوشش سبز و تولید گیاهی قرار گرفت. نتایج نشان داد که شاخصهای ARVI، SARVI و EVI در برآورد تاج پوشش سبز گیاهی (81/=0r2) و تولید گیاهی (بهترتیب با ضرایب تبیین 61/0، 61/0 و 60/0) در رگرسیون درجه سوم مناسبترین گزینهها بودند. به طور کلی نتایج این تحقیق نشاندهنده ارتباط قوی شاخصهای گیاهی حاصل از لندست 8 با تاج پوشش سبز و تولید گیاهی است، هر چند تاج پوشش سبز گیاهی دارای ارتباط قویتری در مقایسه با تولید گیاهی با شاخصهای گیاهی میباشد. به طور کلی نتیجهگیری میشود که تولید و پوشش گیاهی مناطق خشک با دقت نسبتا بالایی می تواند به وسیله شاخصهای گیاهی مستخرج از تصاویر ماهواره ای لندست 8 برآورد گردد. | ||
| کلیدواژه‌ها | ||
| تاج پوشش سبز؛ تولید گیاهی؛ دوره رویشی؛ ARVI؛ EVI؛ SARVI | ||
| عنوان مقاله [English] | ||
| Evaluating of the most suitable vegetation indices of estimating of canopy cover and above-ground phytomass in arid rangelands during different growth periods | ||
| نویسندگان [English] | ||
| F. Pordel1؛ A. Ebrahimi2؛ Z. Azizi3 | ||
| 1MSc in Department of Range and Watershed Management, Faculty of Natural Resources and Earth Sciences, Shahrekord University, Iran | ||
| 2Associate Professor Department of Range and Watershed Management, Faculty of Natural Resources and Earth Sciences, Shahrekord University, Iran | ||
| 3Assistant Professor, Ddepartment of Remote sensing and GIS, Faculty of Natural Resources and Environment, Science and Research Branch, Islamic Azad University, Tehran, Iran | ||
| چکیده [English] | ||
| One of the major applications of remote sensing in environmental resources management is change detection and quantitative assessment of green vegetation. This research assesses the vegetation indices (VIs) derived from Landsat 8 images for modeling canopy cover (CC) and above-ground phytomass (AGP) in Marjan rangelands, Boroujen. CC was measured (using double sampling method) and AGP was also estimated (using grid quadrat method) in 4 sampling periods during growing season in spring till summer using 95 quadrats that were laid out along a 10-km transect in line with 19 sampling points, 3 each contains 5 centroid quadrats with 4-m distance from central quadrat (Total 380 quadrats between May to September 2014). Vegetation indices VIs calculated with outcomes of FLAASH atmospheric correction method for four Landsat-8 image sets obtained between May to September. Ground measurement of plant GCC and AGP between May to September 2014 was regressed against vegetation indices VIs. Results of statistical analysis showed that ARVI, SARVI and EVI showed the highest correlation with CC (R2= 0.81) and with AGP (R2= 0.60, 0.61, 0.61 respectively).Even though, the correlation between CC and AGP with vegetation indicates was high, but CC shows the highest relationship with VIs in comparison to AGP. It can be conclude that arid rangelands vegetation can be accurately estimated with derived vegetation indices from Landsat-8 images, especially those concerned with atmospheric corrections, i.e., ARVI, SARVI and EVI. | ||
| کلیدواژه‌ها [English] | ||
| canopy cover, Aabove-ground phytomass, vegetative stages, ARVI, SARVI, EVI | ||
| مراجع | ||
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