Climate change impacts on dormant season biogeochemical processes are largely ignored in ecosystem studies. However, there is growing recognition that ecosystem biogeochemical cycling may be particularly susceptible to changing climatic conditions during plant senescence and through dormancy. Change in the fall-winter-spring biogeochemical conditions may impact primary production during the coming growing season, creating feedbacks between altered seasonal climate signals and ecosystem processes over decadal time scales. The goal of this organized oral session is to explore the effects of climate drivers, during seasonal periods historically overlooked by ecologists, on biogeochemical cycling and its implications for ecosystem feedbacks. Altered precipitation and temperature regimes during periods of plant senescence and dormancy are predicted for many biomes. This session will incorporate studies ranging from desert to tundra ecosystems, and would be of interest to researchers spanning a wide range of research areas, including empiricists and modelers. An important objective of this session is to identify geographical areas where climate changes during the dormant season have had (or not had) discernable effects on growing season biogeochemical dynamics. This OOS will be organized by biome, with type and duration of climate change manipulation nested within the biome category. We anticipate having two to three speakers from each of four biomes: desert/Mediterranean, temperate forest, boreal forest and tundra (alpine and/or Arctic), representing both short- and long-term perturbations, including empirical studies and mechanistic models. We seek to identify systems that are the most susceptible to climate change during plant dormancy or senescence, and categorize what factors are correlated with systems that are more (or less) vulnerable to these changes. Researchers will be asked to highlight the duration and timing of the climate perturbation(s) they discuss, in an attempt to distinguish resistant ecosystems from those ecosystems that lag between altered soil biogeochemical dynamics and ecosystem feedbacks.