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Above- And Belowground Community Linkages In Boreal Peatlands And Climate Warming Implications, Caitlyn Lyons
Above- And Belowground Community Linkages In Boreal Peatlands And Climate Warming Implications, Caitlyn Lyons
Electronic Thesis and Dissertation Repository
Aboveground plants provide resources to the belowground microbial community via plant litter and, in turn, the belowground microbial community provides nutrients for plant uptake, linking the two systems. My aim was to characterize and describe differences in plant community composition, plant litter quality and microbial community composition between two boreal peatlands in northern Ontario. These peatlands have contrasting plant and microbial communities, the Sphagnum moss-dominated peatland harboring a higher fungi to bacteria ratio compared to the Carex sedge-dominated peatland. Clear open top chambers were installed at both sites to simulate warming. Higher temperatures decreased Sphagnum moss in the Sphagnum-dominated …
Early Warning Of Global Change Effects On Catchment Nutrient Exports, Haibin Dong
Early Warning Of Global Change Effects On Catchment Nutrient Exports, Haibin Dong
Electronic Thesis and Dissertation Repository
Global change scientists seek sentinels of change. On forested landscapes, first-order catchments serve as sentinels of global stressors and their effects on downstream surface waters. Here, I explored global stressors – including climate warming, hydrological intensification, and recovery from atmospheric acidic deposition – and their effects on nutrient exports in 22-year stream chemistry records from 41 forested first-order catchments in a network of North American long-term monitoring sites. First, I used multivariate autoregressive models to establish relationships between changes in global stressors and changes in catchment nutrient exports. Second, I analyzed the residuals of these relationships to determine if there …