Sökning: "semi-arid ecosystems"
Visar resultat 1 - 5 av 6 uppsatser innehållade orden semi-arid ecosystems.
1. The impact of CO2 fertilisation on foliage in West and East Africa
Master-uppsats, Lunds universitet/Institutionen för naturgeografi och ekosystemvetenskapSammanfattning : Anthropogenic impact on terrestrial ecosystems continues to grow as we further enhance atmospheric Carbon Dioxide (CO₂) concentrations. The changing climatic conditions and direct influence of CO₂ on vegetation has a big impact on ecosystem functions. LÄS MER
2. Post-Fire Vegetation Recovery Monitoring using MODIS Time Series: A Case Study in California
Kandidat-uppsats, KTH/GeoinformatikSammanfattning : Human-caused forest fires have increased in magnitude and frequency, affecting global vegetation and requiring a re-evaluation of fire regimes. Changing fire regimes have led to reduced burned areas in fire- dependent ecosystems and increased areas in fire-independent ecosystems, resulting in changes in land cover and posing a threat to native plant communities. LÄS MER
3. Using NDVI Time-Series to Examine Post-fire Vegetation Recovery in California
Master-uppsats, Uppsala universitet/Institutionen för geovetenskaperSammanfattning : Over the past couple of decades, fires have experienced changes on a global scale. These changing fire regimes point to an alarming direction where fire-dependent ecosystems are experiencing a decline in burned area, while fire-independent ecosystems are experiencing an increase. LÄS MER
4. Modelling gross primary production in semi-arid regions: effects on carbon uptake of intensive agriculture in southern Kenya
Master-uppsats, Lunds universitet/Institutionen för naturgeografi och ekosystemvetenskapSammanfattning : Background and aim: Gross primary production (GPP) is the largest global carbon (C) flux and an important component for counteracting anthropogenic CO2 emissions, understanding vegetation dynamics, and sustaining universal human standards. Africa plays a prominent role in the global C cycle, though our understanding of GPP dynamics is largely hampered by a paucity of ground-based observations. LÄS MER
5. Spatial assessment of NDVI as an indicator of desertification in Ethiopia using remote sensing and GIS
Master-uppsats, Lunds universitet/Institutionen för naturgeografi och ekosystemvetenskapSammanfattning : Desertification is a serious environmental and socio-economic problem occurring at global, regional and local scale. According to Article 1(a) of the United Nations Convention to Combat Desertification (UNCCD), define the term “desertification” means “land degradation in arid, semi-arid and dry sub-humid (dry lands) areas resulting from various factors, including climatic variations and human activities”. LÄS MER
