期刊名称：American Journal of Geographic Information System
印刷版ISSN：2163-1131
电子版ISSN：2163-114X
出版年度：2018
卷号：7
期号：5
页码：133-144
DOI：10.5923/j.ajgis.20180705.02
语种：English
出版社：Scientific & Academic Publishing Co.
摘要：Understanding the current changes and dynamics of different vegetation communities under the background of climate change provides basis for ecological restoration in drylands. The spatiotemporal variations of vegetation growth and their relationships with climatic variables across the arid and semi-arid parts of northern Ethiopia have not yet been well researched. This study analyzed the trends (changes) in vegetation greenness of the dry Afromontane forests of northern Ethiopia and examined their relationships with the climatic variations for the period 2000-2016, based on space-based vegetation index derived from the Moderate Resolution Imaging Spectroradiometer (MODIS13Q1) product and gridded high-resolution climate datasets. A simple linear regression model, correlation analysis, and trend analysis (using Mann-Kendall test and Theil-Sen median trend analysis) were used to assess vegetation dynamics and their responses to climate variability. Results of the study showed a general decreasing trend in vegetation greenness and slight warming trends, with considerable spatiotemporal variations. The NDVI-rainfall relationships were positive in both study sites, implying that rainfall is the main factor which determines vegetation growth in the study region. Future works may need to concentrate on time-series data with better quality (e.g. high resolution) and incorporate land use change and other eco-climatological factors into the study to better account for the spatiotemporal vegetation variability.
