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 Table 4.5 NDVI change with respect to area cover (ha) in selected years Area coverage (ha and %) by NDVI values across the year NDVI Year 2000 Year 2005 Year 2010 ha % ha % ha % 0-0.1 1000 0.04 900 0.03 1400 0.05 0.1-0.2 108800 3.77 144900 5.02 149200 5.17 0.2-0-3 1874300 64.99 1403800 48.67 1408900 48.83 0.3-0.4 797300 27.64 922700 31.99 861400 29.85 0.4-0.5 88200 3.06 317800 11.02 338500 11.73 0.5-0.6 11800 0.41 81100 2.81 111900 3.88 >0.6 2700 0.09 13400 0.46 14200 0.49 The analysis also reveals that the study area has been subject to remarkable vegetation dynamics. The change was observed in areas where few vegetation signatures had previously been detected. The major restoration measures in the area are protection of degraded lands by self-regeneration, which is termed as exclosure. As evidenced through NDVI analysis and field visits, the exclosure practiced in recent times has brought tangible change. Areas showing positive but non-significant NDVI change represent recent exclosures, which are dominated by lower-layer vegetation such as grasses, herbaceous and scattered woody vegetation; signals are similar to that of grasslands and dried during the analysis periods, i.e., January to April. Therefore, the NDVI values smaller than the green vegetation in the study months represent dry grasses in recent exclosures. This implies that the area has been undergoing tangible vegetation restoration in some parts that will develop to higher vegetation layers through time. On the other hand, the decreased vegetation cover in the other parts could be due to less conservation activities of the community and local administration. Areas where SWC interventions started earlier showed considerable improvement. Intervention of NGOs in natural resources management (NRM) stimulated and enhanced the activities of the community and local level offices (Tekle 1999; Descheemaerker et al. 2006). Informants interviewed during the field research acknowledged the SWC effort of government and non-government organizations such as the respective districts agriculture offices, Organization for Rehabilitation and Development in Amhara (ORDA), Kobo-Girana Valley Development Program (KGVDP), Ethiopian Orthodox Church Development and Inter-Church Aid Commission (EOC-DICAC) and Ethiopian Evangelical Church Mekane Yesus Development and Social Services Commission (EECMY-DASSC). 52

Land use-land cover and normalized difference vegetation index changes in Wello Figure 4.8 NDVI spatio-temporal variation in response to restoration 53

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