Informations et ressources scientifiques
sur le développement des zones arides et semi-arides

Titre : Monitoring vegetation degradation in arid and semi_arid regions of Rajasthan using spot_4 vegetation data with particular reference to surface parameters

Auteur : Shukla, Yogita

Université de soutenance : Savitribai Phule Pune University

Grade : Doctor of Philosophy (PhD) 2007

Description
Vegetation degradation monitoring in arid and semi-arid regions has gained impetus in the recent times in view of the rapid and extensive transformation of land surface and land cover. Characterizing the dynamics of vegetation in these regions helps in building the understanding of the global climate change mechanisms. The present study addresses the vegetation degradation monitoring in arid and semi-arid regions with particular reference to surface parameters for green vegetation like green leaf area index and green fractional cover. Vegetation in arid and semi-arid regions is highly variable and seasonal. During the dry spell there is no or little vegetation and therefore getting information about vegetation purely on the basis of land use and land cover may not be able to give precise estimate of vegetation condition. Green vegetation parameters had been therefore quantified to give reasonable estimate of vegetation amount and condition. To define the significance of chosen topic the entire work is divided into seven chapters. Each chapter has its own contribution towards the fulfillment of objectives and research questions. Chapter one deal with general introduction to arid and semi-arid regions, their role in global climate change dynamics, land degradation, desertification and its impact, vegetation dynamics and role of remote sensing and GIS in vegetation degradation monitoring. Chapter two describes the study area which was the entire state of Rajasthan in details. Chapter three describes the surface parameters green leaf area index (GLAI) and green fractional cover (g/c), characterized in this study. It also details out their difference as well as their individual role in land surface dynamics. Chapter four describes the materials and methodology adopted in this study. Chapter five gives the detail results on vegetation classification and surface parameterisation. Chapter six discusses the findings of the study and corroborate it with similar such findings and discuss. Details of findings are supported by discussion, tables, graphs and figures in each chapter.

Présentation et version intégrale (Shodhganga)