Type de contrat: Stage
Durée: 4-6 months
Lieu de travail: Belvaux
Droughts may cause loss vegetation productivity and ecosystem services, and are thus an important socio-economic risk. Even moderate droughts (as they occasionnally occur in Luxembourg) and transient heat stress alter the plant physiological functioning (e.g., transpiration and photosynthesis), and thus may have an effect on the spectral response of plants both in visible and thermal infrared domain of electromagnetic spectrum. Plant and soil properties like soil moisture, fAPAR, canopy temperature and evapotranspiration are typically interlinked. However, the nature of these relations along gradients of geomorphology, soil type and vegetation type is not well understood. On the other side, the interference of frequent clouds put a major problem in the use of thermal and optical remote sensing. Given the cloud proof characteristics of microwave remote sensing, we aim to integrate visible-thermal infrared with microwave remote sensing and use their synergy. We explore the impact of spatial variability of soil moisture, vegetation, and geomorphology on the vegetation water use and stress in a forested catchment in Luxembourg.
Maps of biophysical variables derived from optical, thermal and microwave remote sensing will be validated with ground measurements (available for about 40 plots). The spatial relations between those variables will be analysed, interpreted and reported.