The application of remote sensing to study shrub—herbaceous relations at a high spatial resolution

Abstract

Ecosystems of mixed woody and herbaceous vegetation are under increasing pressure and threat from human activity and global climate changes. Many processes that shape these ecosystems remain poorly understood despite their large geographic extent, the services they provide, and their importance for wildlife and livestock. Some of these processes occur simultaneously on small and large scales; therefore their study requires methodologies that combine high spatial resolution with large spatial extent. In this study, we explored the phenomenon of rings—circlets—of relatively dense herbaceous biomass that seem to occur around patches of Sarcopoterium spinosum in the semiarid northern Negev. We developed a novel, non-destructive method to estimate herbaceous biomass at a high spatial resolution, over an area of 1500 m2. Steps in the study process included: low-altitude aerial photography, image rectification, delineation of shrub patches, computation of herbaceous biomass in the intershrub area, and analysis...