نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشجوی کارشناسی ارشد برنامه‌ریزی شهری، ﭘﺮﺩﻳﺲ ﻫﻨﺮﻫﺎﻯ ﺯﻳﺒﺎ دانشگاه تهران، ﺗﻬﺮﺍﻥ، ﺍﻳﺮﺍﻥ
2 استادیار گروه جغرافیای طبیعی (اقلیم شناسی)، دانشگاه تهران، تهران، ایران
چکیده
در پژوهش حاضر با هدف ارزیابی روند تغییرات پوشش فضای سبز در بازه زمانی 2013-2019، از داده‌های سنجش از دور (لندست 8) با پوشش ابر کمتر از ده درصد، برای تعیین کاربری اراضی و روند تغییرات آن در 7 سال گذشته استفاده شد. نقشه‌های کاربری اراضی، در برنامهENVI 5.3 در قالب سه کلاس فضاهای سبز، اراضی انسان ساخت (شامل تمامی کاربری های انسان ساخت به جز فضاهای سبز و پوشش های گیاهی) و اراضی بایر تولید شد و برای طبقه بندی این نقشه‌ها از روش حداکثر احتمال استفاده گردید. در ادامه، از سنجه های سیمای سرزمین شامل سنجه مساحت لکه‌ها (CA)، متوسط اندازه لکه‌ها MPS) )، تراکم لکه‌ها (PD) و متوسط فاصله همسایگی MMNND) ا (برای تعیین حضور، پایداری، توزیع و به طور کلی نحوه تغییر اراضی سبز در شهر قزوین (شامل 3 منطقه) درطی دوره مطالعاتی استفاده شد. نتایج این تحقیق نشان داد که در طی دوره مطالعاتی، بیشترین تغییر فضای سبز در منطقه 1 قزوین (جنوب شهر) و کمترین آن در منطقه 3 این شهر (شمال شهر) رخ داده است. علاوه بر این، براساس سنجه های سیمای سرزمین مشخص شد که مساحت لکه‌های سبز و تراکم آنها به ترتیب به میزان 71/73 هکتار و 8075/0 در هر 100 هکتار کاهش یافته و از طرفی متوسط اندازه و فاصله همسایگی این اراضی به میزان 1061/0 هکتار و 2846/5 متر افزایش داشته است. این نتایج نشان از تبدیل لکه‌های ریزدانه به درشت‌دانه‌تر و افزایش پایداری آنها با وجود کاهش میزان حضور پذیری این اراضی است
کلیدواژه‌ها
عنوان مقاله [English]
Evaluating the trend of urban green space changes using landscape metrics (Case study: Qazvin city)
نویسندگان [English]
- Soheil Gheshlaghpour 1
- Masoumeh Moghbel 2
1 MSc student of urban planning, Fine Arts, University of Tehran, Tehran, Iran
2 Department of Physical Geography, Faculty of Geography, University of Tehran, Tehran, Iran
چکیده [English]
Rising temperatures and the formation of Urban Heat Islands (UHI) are the main consequences of population growth and uncontrolled expansion of cities. Green infrastructures are one of the nature based solutions. These infrastructures can be considered as an important strategy to reduce the damages caused by urban development and increase the quality of citizens’s life. Landscape ecology and its metrics are among the methods of evaluating green infrastructure in urban environments. Hence, the main objective of this research is to evaluate changes in urban green infrastructure during the period of 2013-2019 in Qazvin city. To do so, green infrastructures changes were investigated using remote sensing data and landscape metrics including presence (Class Area), stability (Mean Patch Size) and distribution (Patch Density, Mean Euclidean Distance Neighbor) in three regions of Qazvin. The results showed a decrease of 73.71 hectares in the Class Area (presence) and an increase of 0.1061 hectares in their Mean Patch Size (stability). Furthermore, the density of green infrastructures has experienced 0.8075 decrease per 100 hectares while the Mean Euclidean distance neighbor has increased about 5.5846 meters. These results indicate the conversion of small classes of green infrastructures to bigger classes and increase their stability despite the decrease in their presence. Therefore, planning and management by creating and expansion of green lands seems necessary in order to reduce the effects of urban development, improve the quality of citizen’s life and preserving green infrastructures of Qazvin.
کلیدواژه‌ها [English]
- Environmental Sustainability
- Urban Green Infrastructures
- Landscape Ecology
- Qazvin City
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