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Showing result 21 - 25 of 40 essays matching the above criteria.

1. 21. Modelling global Gross Primary Production using the correlation between key leaf traits

   University essay from Lunds universitet/Institutionen för naturgeografi och ekosystemvetenskap

   Author : Alexandra Pongrácz; [2017]
   Keywords : ecosystem modelling; leaf longevity; leaf nitrogen content; leaf mass per area; LEIA; LPJ-GUESS; GPP; terrestrial biosphere; Earth and Environmental Sciences; Biology and Life Sciences;

   Abstract : Sophisticated ecosystem models make it possible to evaluate the potential future changes of the carbon sequestration capacity of the terrestrial biosphere, as a response to the rapid environmental and climatic changes. Accuracy of model estimates is however strongly dependent on the parametrisation of driving parameters. READ MORE

3. 22. Improvement of the GPP estimations for Sudan using the evaporative fraction as water stress factor

   University essay from Lunds universitet/Institutionen för naturgeografi och ekosystemvetenskap

   Author : Maria Angela Dissegna; [2016]
   Keywords : semi-arid regions; light use efficiency models; evaporative fraction; gross primary production; Physical Geography and Ecosystem analysis; GEM; Earth and Environmental Sciences;

   Abstract : Estimation of GPP in Sudan using the evaporative fraction as water stress factor The Gross Primary Production "GPP" quantifies the amount of carbon entering an ecosystem. It is an ecosystem service since it is a source of energy for all organisms and it is estimated to reduce atmospheric CO2 in about 123 Pg C per year at the global scale. READ MORE

4. 23. Assessment of the relationship between the Photochemical Reflectance Index and Light Use Efficiency : a study of its seasonal and diurnal variation in a sub-arctic birch forest, Abisko, Sweden

   University essay from Lunds universitet/Institutionen för naturgeografi och ekosystemvetenskap

   Author : Elsa Lindevall; [2016]
   Keywords : PRI; LUE; seasonal variability; diurnal variability; Earth and Environmental Sciences;

   Abstract : Photosynthesis, which describes the uptake of carbon from the atmosphere by vegetation, is key to the natural mitigation of anthropogenic climate change. Its accurate assessment is therefore of vital importance for correct estimates of the global carbon balance and the understanding of global carbon dynamics. READ MORE

5. 24. Effects of altered precipitation regimes on bryophyte carbon dynamics in a Peruvian tropical montane cloud forest

   University essay from Lunds universitet/Institutionen för naturgeografi och ekosystemvetenskap

   Author : Jenny Ahlstrand; [2016]
   Keywords : precipitation; tropical mountain cloud forest; Bryophytes; Peru; carbon dynamics; physical geography and ecosystem science; Earth and Environmental Sciences;

   Abstract : Tropical montane cloud forests (TMCF) are unique ecosystems that are frequently surrounded by clouds which increase humidity and promote the growth of bryophytes. Several dimensions of humidity are important for the carbon dynamics of bryophytes. Climate change is therefore projected to have a large impact on them as well as on the TMCF itself. READ MORE

6. 25. Estimating and evaluating GPP in the Sahel using MSG/SEVIRI and MODIS satellite data

   University essay from Lunds universitet/Institutionen för naturgeografi och ekosystemvetenskap

   Author : Gustav Wallner; [2015]
   Keywords : geography; physical geography; GPP; Sahel; Dahra; remote sensing; Meteosat; MSG; MODIS; SEVIRI; Earth and Environmental Sciences;

   Abstract : The aim of this study was to use data from Meteosat Second Generation’s Spinning Enhanced Visible and Infrared Imager (MSG/SEVIRI) to calculate the gross primary production (GPP) in the Sahel region of Africa for 2011 and 2012. GPP was calculated using the light use efficiency method, which relates GPP to the absorbed photosynthetically active radiation the light use efficiency. READ MORE