Forest Vegetation Dynamics and their Response to Land Surface Temperature in West Arsi Zone Southwest Ethiopia

T. Leta¹ , H. Wondu² , D. Chala³ , D. Yadeta⁴

Section:Research Paper, Product Type: Journal-Paper
Vol.8 , Issue.12 , pp.1-8, Dec-2022

Online published on Dec 31, 2022

Copyright © T. Leta, H. Wondu, D. Chala, D. Yadeta . This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
 

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Abstract :
Extreme weather and climate events have increased as a result of global warming, particularly the intensity and frequency of droughts. Vegetation is the dominant component of terrestrial ecosystems on the earth`s surface, playing an important role in the regulation of climate change, carbon cycling, and energy exchange between the atmosphere, the earth`s surface, and hydrological processes. Vegetation cover has a significant effect on the distribution of land surface temperature (LST). The overarching objective of the study was to determine the influence of forest vegetation dynamics as well as its response to surface temperature in the western Arsi zone of Southwestern Ethiopia. The study used satellite images from Landsat 5 TM and Landsat 8 OLI for the periods of 1991, 2001, 2011, and 2021. The study used QGIS software and Microsoft Excel software to determine NDVI, LST and for correlation analysis of NDVI and LST. Finally, a regression technique is used to obtain the correlation between LST and NDVI. The highest NDVI values were recorded in 1991 (-0.43 to 0.78), corresponding to a densely vegetated area, and the lowest NDVI values were recorded in 2021 (-0.42 to 0.65), due to forest land change to another land scape. The result shows that the high LST values are in year of 2021 (11.8 oC to 54.02 oC) and the lowest LST values are in year of 1991 (0.84 oC to 36.85 oC). The result shows that NDVI and LST had linear regression analysis (R2) for four years in which the analysis indicated that LST and NDVI are negatively correlated to each other which is 0.65, 0.71,0.63 and 0.66 for the years of 1991, 2001, 2011and 2021, respectively.

Key-Words / Index Term :
Normalized Difference Vegetation Index (NDVI), land surface temperature (LST), Correlation analysis

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