Evaluating the Association between Climate Variability and Vegetation Dynamics by Using Remote Sensing Techniques: The Case of Upper Awash Basin, Ethiopia

Getachew Bayable Tiruneh^1, , Berhan Gessesse², Tulu Besha³ and Getachew Workineh⁴

¹Department of Land Administration and Surveying, Oda Bultum University, Chiro, Ethiopia

²Remote Sensing Research Division, Entoto Observatory and Research Centre, Addis Ababa, Ethiopia

³Geodesy Research Division, Entoto Observatory and Research Centre, Addis Ababa, Ethiopia

⁴Department of Geography and Environmental Science, Debre Tabor University, Debre Tabor, Ethiopia

Cite this paper

Getachew Bayable Tiruneh, Berhan Gessesse, Tulu Besha and Getachew Workineh. Evaluating the Association between Climate Variability and Vegetation Dynamics by Using Remote Sensing Techniques: The Case of Upper Awash Basin, Ethiopia. World Journal of Agricultural Research. 2018; 6(4):153-166. doi: 10.12691/WJAR-6-4-6

Abstract

Examining the impact of climate variability on vegetation dynamics is the missing research element in Upper Awash Basin. Hence, the aim of this study was investigating climate variability and their impacts on vegetation dynamics. Monthly 250 meter resolution Moderate Imaging Spectro-radiometer (MODIS) Normalized difference vegetation Index (NDVI), 1kilometer resolution MODIS Land Surface Temperature (LST), rainfall data from 19 meteorological stations, and NINO3.4 (SSTA) were used for this study. A Mann Kendall (MK) trend test was used to determine the trend of each dataset using seasonal and annual time-series. Pearson correlation coefficient was also used to estimate the association between NDVI and climatic elements. Results of this study revealed that there was no significant change in the annual and seasonal NDVI, LST, Sea surface Temperature Anomaly (SSTA) and rainfall during the period 2001 to 2016, except NDVI in belg season. The correlation between NDVI and rainfall was positive (r = 0.51), strong positive (r= 0.62), low positive (r = 0.45) and low negative (r = -0.33) for annual, belg, bega and kiremit seasons, respectively. Similarly, the correlation between NDVI and LST was negative (r = - 0.58), strong negative (r= -0.67), negative (r = -0.5) and low positive (r = 0.41) for annual, belg, bega and kiremit seasons, respectively. On the other hand, the correlation between NDVI and SSTA was low negative (r = - 0.41), weak negative (r= -0.29), weak positive (r = 0.22) and low positive (r = 0.42) for annual, bega, belg as well as kiremit seasons, respectively.

Keywords

climate variability, LST, NDVI, RF, SSTA, upper awash basin

Copyright

This work is licensed under a Creative Commons Attribution 4.0 International License. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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