نیوار

نیوار

ارزیابی تغییرات پوشش گیاهی و رابطه آن با دما و بارش (مطالعه موردی :حوضه آبریز دریاچه ارومیه)

نوع مقاله : مقاله پژوهشی

نویسندگان
1 دانشیار اقلیم شناسی و عضو هیئت علمی گروه جغرافیا دانشگاه یزد ،یزد، ایران
2 دانشجوی دکتری اقلیم شناسی دانشگاه یزد، یزد، ایران
چکیده
پوشش گیاهی، یکی از عوامل ضروری در ساختار و عملکرد اکوسیستم‌های خشکی و یکی از حلقه‌های اساسی زنجیر حیاتی آب-خاک-گیاه و اتمسفر است .تحقیق حاضر به منظور بررسی تغییرات پوشش گیاهی و عوامل موثر برآن، در حوضه آبریز دریاچه ارومیه انجام شد. در این رابطه تصاویر بارش برگرفته پایگاه CHRIPS و تصاویرLST و NDVI برگرفته از سنجنده مودیس، طی دوره آماری 23 ساله (2023-2001 ) استفاده شد. نتایج میزان بارندگی فصلی نشان می‌دهد بارش‌ها در این حوضه از اطراف حوضه به سمت مرکز حوضه روند کاهشی داشته است. بیشترین بارش‌ها در این حوضه مربوط به فصل زمستان درسال های 2018 و 2019 و کمترین بارش ها مربوط به فصل تابستان در سال 2003 می باشد. دمای سطح زمین به دلیل تغییر در پوشش گیاهی حوضه آبریز دریاچه ارومیه افرایش یافته است. همچنین مشخص شد که اکثر فصول طی این دوره دمایی مابین ۲۰ تا ۴۰ درجه سانتی گراد داشته‌اند که ناحیه‌ای حدود 25 تا ۳۵ هزار کیلومتر مربع را در برگرفته است .بررسی پوشش گیاهی حوضه آبریز دریاچه ارومیه نشان داد که بیشترین مساحت پوشش گیاهی در فصل بهار که دارای روندکاهشی (R2=0.151) بوده است و کمترین مساحت پوشش گیاهی در فصل زمستان با روند کاهشی (R2=-0.44) رخ داده است. نتایج همبستگی بین بارش و پوشش گیاهی نشان داد در فصل زمستان و پاییز همبستگی مثبت و معنی داری و در فصل بهار و تابستان همبستگی مثبت و غیرمعنی داری در سطح اطمینان 05/0 وجود دارد. همبستگی دما و پوشش گیاهی نشان داد در فصل زمستان همبستگی مثبت و رابطه قوی و معناداری در سطح اطمینان 01/0 وجود دارد.
کلیدواژه‌ها
موضوعات

عنوان مقاله English

Assessment of Vegetation Cover Changes and its Relationship with Temperature and Precipitation (Case Study: Urmia Lake Basin)

نویسندگان English

Ahmad Mazidi 1
Hamideh Dehghan 2
Hajar Toofani Kopai 2
1 Associate Professor of Climatology and Faculty Member, Department of Geography, Yazd University, Yazd, Iran
2 PhD student in Climatology, Yazd University, Yazd, Iran
چکیده English

Vegetation cover is an essential factor in the structure and function of terrestrial ecosystems and one of the fundamental links in the vital water-soil-plant-atmosphere chain. This research was conducted to investigate vegetation cover changes and the factors affecting it in the Urmia Lake Basin. In this regard, precipitation images from the CHRIPS database and LST and NDVI images from the MODIS sensor were used during a 23-year statistical period (2001-2023). The results of the seasonal rainfall rate show that rainfall in this basin has a decreasing trend from the periphery of the basin towards the center of the basin. The highest rainfall in this basin is related to the winter season in 2018 and 2019, and the lowest rainfall is related to the summer season in 2003. The land surface temperature has increased due to changes in the vegetation cover of the Urmia Lake Basin. It was also found that most seasons during this period had a temperature between 20 and 40 degrees Celsius, which covered an area of about 25 to 35 thousand square kilometers. The study of vegetation cover in the Urmia Lake Basin showed that the largest area of vegetation cover occurs in the spring season, which has a decreasing trend (R2 = -0.151), and the smallest area of vegetation cover occurs in the winter season with a decreasing trend (R2 = -0.44). The results of the correlation between rainfall and vegetation cover showed that there is a positive and significant correlation in the winter and autumn seasons, and a positive and non-significant correlation in the spring and summer seasons at the 0.05 confidence level. The correlation between temperature and vegetation cover showed that there is a positive correlation and a strong and significant relationship in the winter season at the 0.01 confidence level.

کلیدواژه‌ها English

Land Surface Temperature
Vegetation Cover
Urmia Lake Basin
MODIS Sensor
 
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  • تاریخ دریافت 16 بهمن 1403
  • تاریخ بازنگری 01 تیر 1404
  • تاریخ پذیرش 21 تیر 1404
  • تاریخ انتشار 01 مهر 1404