Essays about: "semi-arid ecosystems"

Showing result 1 - 5 of 6 essays containing the words semi-arid ecosystems.

  1. 1. The impact of CO2 fertilisation on foliage in West and East Africa

    University essay from Lunds universitet/Institutionen för naturgeografi och ekosystemvetenskap

    Author : Gaetane Demyttenaere; [2023]
    Keywords : Physical geography and ecosystem analysis; CO2 fertilisation; semi-arid ecosystems; remote sensing; Normalised Difference Vegetation Index; Earth and Environmental Sciences;

    Abstract : 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. READ MORE

  3. 2. Post-Fire Vegetation Recovery Monitoring using MODIS Time Series: A Case Study in California

    University essay from KTH/Geoinformatik

    Author : Julia Edje; [2023]
    Keywords : vegetation recovery; MODIS; HRT; EVI; fire; burn severity; land cover; climate zone; California;

    Abstract : 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. READ MORE

  4. 3. Using NDVI Time-Series to Examine Post-fire Vegetation Recovery in California

    University essay from Uppsala universitet/Institutionen för geovetenskaper

    Author : Viktor Wu; [2022]
    Keywords : fire; California; NDVI; land cover; vegetation; post-fire recovery;

    Abstract : 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. READ MORE

  5. 4. Modelling gross primary production in semi-arid regions: effects on carbon uptake of intensive agriculture in southern Kenya

    University essay from Lunds universitet/Institutionen för naturgeografi och ekosystemvetenskap

    Author : Malin Ahlbäck; [2020]
    Keywords : Physical Geography; Ecosystem Analysis; GPP; Africa; Kenya; Land cover changes; Cropland; Remote sensing; Sentinel-2; Earth and Environmental Sciences;

    Abstract : 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. READ MORE

  6. 5. Spatial assessment of NDVI as an indicator of desertification in Ethiopia using remote sensing and GIS

    University essay from Lunds universitet/Institutionen för naturgeografi och ekosystemvetenskap

    Author : Gezahagn Negash Seboka; [2016]
    Keywords : NDVI and Rainfall; land degradation; climate change; desertification; NOAA AVHRR; land cover; GIS; Physical Geography and Ecosystem analysis; Earth and Environmental Sciences;

    Abstract : 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”. READ MORE