5 years ago

Die Wirksamkeit von Boden

Die Wirksamkeit von Boden

Land use-land cover and

Land use-land cover and normalized difference vegetation index changes in Wello during the dry period. This indicates that the analysis is unlikely influenced by vegetation types. Therefore, areas showing significant restoration are very small both at the 90% and 95% confidence level. This comparison is similar to that of the LULC change analysis where the wood vegetation cover showed little change. Figure 4.7 Inter-annual NDVI change: (a) NDVI gradients across districts, (b) districts in the study area Comparison of the DEM slope map (Figure 4.1) and NDVI change map (Figure 4.6b) reveals that vegetation degradation hotspots occupied relatively gently sloped areas, while areas showing restoration mainly occupied steeper slopes. The interannual NDVI change was also clearly different depending on administrative unit (Figure 4.7). Although NDVI changes showed differences across districts, areas showing significant vegetation restoration and degradation occupy nearly adjacent areas. In relative terms, the northeast, western and northwest central parts (Figure 4.7) were identified as hotspot areas of vegetation degradation. Accordingly, most of Kobo, eastern Bugna, southwestern and northern Gidan, larger parts of Meket and Habru, western Wadela and parts of Dawunt-Delanta in North Wello; and eastern Kalu, 50

Land use-land cover and normalized difference vegetation index changes in Wello southern Albuko, southern Kelela, large parts of Debresina, Wegde and Werebabu, a few parts of Sayint districts in South Wello are the hotspot areas (Figure 4.7 and Table 4.4). In contrast, large parts of Ambasel, Dessie-Zuria, Guba-Lafto, Jama, Legambo, Tehuledere, Tenta and Were-Illu, some parts of western Bugna, southeast Gidan, and parts of Mekdla districts showed restoration. Generally, areas showing restoration followed regular geographic patterns mainly along highways, while hotspot areas are dominantly located in remote parts. Table 4.4 NDVI change between 2000 and 2010 (January to April) by district Districts in South NDVI trend Districts in North NDVI trend Wello Zone A B Wello Zone A B Albuko � � Bugna � Ambasel � � Dawunt-Delanta � Debresina � Gidan � � Dessie Zuria � � Kobo � Jama � � Meket � Kalu � Wadla � Kelela � Guba-Lafto � Kombolcha � Kutaber � Legambo � Mekdela � � Sayint � Habru � Tehuledere � � Tenta � � Wegde � Were-Ilu � � Werebabu � Note: A = NDVI decline with some increase, B = NDVI increase with some decrease Comparison of the NDVI trend considering 2000, 2005 and 2010 showed improvement across time. The areas covered by higher NDVI values in 2000 were scattered and sparse, while in 2005 and 2010 increased both in depth and width (Figure 4.8). The area covered by higher NDVI values (> 0.4) increased from 3.6% in 2000 to 14.3% in 2005 and to 16.1% in 2010. The area covered NDVI values between 0.3 and 0.4, which might be new exclosure (grassland/woody grassland) increased from 27.6% in 2000 to 30% in 2010 (Table 4.5). This shows that the green biomass cover and signal depth showed a considerable change over time. This analysis is also similar to the results of the LULC change detection. 51

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