基于地理空间技术的湿地动态分析——以埃塞俄比亚西部Horo Guduru Wollega地区Abay Choman和Jimma Geneti流域为例

IF 3.5 Q2 ENVIRONMENTAL SCIENCES
Mitiku Badasa Moisa, T. W. Bulto, Birhanu Chalchisa Werku, Yifru Waktole Berkessa, A. Chebo, Daniel Assefa Negash, D. O. Gemeda
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引用次数: 2

摘要

湿地生态系统是提供不同生态系统服务的重要区域之一,也是动植物的栖息地。尽管具有多种用途,但湿地生态系统仍面临威胁。本研究试图利用地理空间技术分析埃塞俄比亚西部Horo Guduru Wollega地区Abay Choman和Jimma Geneti流域的湿地动态。利用1991年Landsat 5 TM、2003年Landsat 7ETM+和2021年OLI/TIRS对土地利用、土地覆被(LULC)、归一化植被指数(NDVI)和归一化水指数(NDWI)进行了研究。在本研究中,使用极大似然算法对LULC进行监督分类。利用三个不同时期Landsat图像的红色和红外波段计算NDVI,利用多光谱Landsat图像的绿色和近红外(NIR)波段估算NDWI。结果表明:研究区湿地生态系统以4.2 km2/年的速度减少了125.2 km2 (8.8%);1991 - 2021年,农业用地以7.4 km2/年的速度增加223.4 km2。湿地转化为耕地的面积约为66.7 km2,草地和灌木转化为耕地的面积分别为29.3 km2和24.7 km2。结果表明,1991 ~ 2021年NDVI和NDWI最大值呈下降趋势。为尽量减少研究区内湿地和水体的迅速流失,应促进适当的土地利用规划和环境教育。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Analyzing Wetland Dynamics Using Geospatial Techniques: A Case of Abay Choman and Jimma Geneti Watershed, Horo Guduru Wollega Zone, Western Ethiopia
Wetland ecosystems are one of the most important areas that provides different ecosystems services as well as habitat for plant and animal species. In spite of multipurpose, wetland ecosystems are under threats. This study attempts to analyze wetland dynamics of Abay Choman and Jimma Geneti watershed in Horo Guduru Wollega Zone, Western Ethiopia using geospatial techniques. The land use land cover (LULC), the Normalized Difference Vegetation Index (NDVI), and Normalized Difference Water Index (NDWI) were investigated using Landsat 5 TM of 1991, Landsat 7ETM+ of 2003, and OLI/TIRS of 2021. In the present study, the LULC was classified using a supervised classification method with maximum likelihood algorithm. The red and infrared bands of Landsat imagery from three different time periods were used to calculate NDVI, while the NDWI was estimated using the green and near infrared (NIR) bands of multispectral Landsat images. Results show that wetland ecosystem in the study area decreased by about 125.2 km2 (8.8%) with the rate of 4.2 km2/year. In contrast, agricultural land increased by 223.4 km2 with the rate of 7.4 km2/year between 1991 and 2021. About 66.7 km2 wetland was converted to cultivated land whereas 29.3 and 24.7 km2 of grassland and shrubs land were converted into cultivated land. As a result, the maximum NDVI and NDWI values were decreased between 1991 and 2021. To minimize the rapid loss of wetland and water bodies in the study area, proper land use planning and environmental education should be promoted.
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来源期刊
Air Soil and Water Research
Air Soil and Water Research ENVIRONMENTAL SCIENCES-
CiteScore
7.80
自引率
5.30%
发文量
27
审稿时长
8 weeks
期刊介绍: Air, Soil & Water Research is an open access, peer reviewed international journal covering all areas of research into soil, air and water. The journal looks at each aspect individually, as well as how they interact, with each other and different components of the environment. This includes properties (including physical, chemical, biochemical and biological), analysis, microbiology, chemicals and pollution, consequences for plants and crops, soil hydrology, changes and consequences of change, social issues, and more. The journal welcomes readerships from all fields, but hopes to be particularly profitable to analytical and water chemists and geologists as well as chemical, environmental, petrochemical, water treatment, geophysics and geological engineers. The journal has a multi-disciplinary approach and includes research, results, theory, models, analysis, applications and reviews. Work in lab or field is applicable. Of particular interest are manuscripts relating to environmental concerns. Other possible topics include, but are not limited to: Properties and analysis covering all areas of research into soil, air and water individually as well as how they interact with each other and different components of the environment Soil hydrology and microbiology Changes and consequences of environmental change, chemicals and pollution.
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