Final answer:
The subfield of ecology that encompasses a project examining how landscape fragmentation affects nutrient cycling within a eucalyptus forest is ecosystem ecology. Ecosystem ecology focuses on studying how nutrients and energy are stored and moved among organisms and through the surrounding atmosphere, soil, and water.
Step-by-step explanation:
Ecosystem ecology is the subfield of ecology that would encompass a project examining how landscape fragmentation affects nutrient cycling within a eucalyptus forest. Ecosystem ecology focuses on studying how nutrients and energy are stored and moved among organisms and through the surrounding atmosphere, soil, and water. In this project, the researcher would investigate the impact of landscape fragmentation on nutrient availability and cycling within the eucalyptus forest ecosystem.