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اثر تغییرات سطح و ماندگاری پوشش برف بر پوشش گیاهی در استان چهارمحال و بختیاری | ||
نشریه علمی - پژوهشی مرتع و آبخیزداری | ||
دوره 74، شماره 4، اسفند 1400، صفحه 917-938 اصل مقاله (1.87 M) | ||
نوع مقاله: مقاله پژوهشی | ||
شناسه دیجیتال (DOI): 10.22059/jrwm.2022.317220.1559 | ||
نویسندگان | ||
لیلا یغمایی1؛ رضا جعفری* 2؛ سعید سلطانی3؛ حسن جهانبازی4 | ||
1دانشآموخته دکتری علوم و مهندسی مرتع، دانشکده منابع طبیعی، دانشگاه صنعتی اصفهان | ||
2دانشیار گروه مرتع و آبخیزداری، دانشکده منابع طبیعی، دانشگاه صنعتی اصفهان | ||
3استاد گروه مرتع و آبخیزداری، دانشکده منابع طبیعی، دانشگاه صنعتی اصفهان | ||
4استادیار پژوهشی مرکز تحقیقات کشاورزی و منابع طبیعی استان چهارمحال و بختیاری | ||
چکیده | ||
برف از عوامل موثر بر میزان و عملکرد پوشش گیاهی در ارتفاعات می باشد. هدف از این پژوهش، بررسی اثر شاخص های سطح پوشش برف و ماندگاری پوشش برف بر دو گونه غالب و دارای زوال شامل گون گزی (Astragalus adscendens) و بلوط ایرانی (Quercus brantii) در استان چهارمحال و بختیاری از سال 1382 تا 1395 (2016-2003) میباشد. بدین منظور مقادیر شاخص نرمال شده تفاضل برف (Normalized Difference Snow Index ,NDSI) و شاخص نرمال شده تفاضل پوشش گیاهی (Normalized Difference Vegetation Index, NDVI) از تصاویر ماهواره ای MODIS استخراج و در محدوده های دارای زوال پوشش گیاهی جنگلی (مناطق بارز، سوه، هلن و منطقه شاهد جنگی) و پوشش مرتعی (منطقه زوال گون گزی و منطقه شاهد گون گزی) با استفاده از آنالیز پیرسون مقایسه گردید. نتایج نشان داد که متوسط کاهش سطح پوشش برف در استان طی دوره مورد بررسی تا حدود 32 درصد قابل مشاهده است، اگرچه روند ثابتی ملاحظه نگردید. شاخص های برف مطالعاتی حداکثر همبستگی را با پوشش های مرتعی و جنگلی در ماه مارس نشان دادند. مناطق دارای زوال گون گزی بیشترین همبستگی را با شاخص سطح برف (R>0.70) و شاخص ماندگاری پوشش برف (R>0.71) در ماه مذکور نشان داد. لذا، نتایج بیانگر آن است که تاثیر ماندگاری برف بر پوشش گیاهی بیشتر از سطح برف می باشد. مطابق یافته های تحقیق، بارش های برف انتهای فصل زمستان و ماندگاری آن بر میزان پوشش گون گزی در مقایسه با پوشش گیاهی جنگلی موثرتر و در صورت کاهش برف این گونه به زوال حساس تر می گردد. | ||
کلیدواژهها | ||
سطح پوشش برف؛ ماندگاری پوشش برف؛ NDSI؛ NDVI؛ MODIS | ||
مراجع | ||
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