title: Impacts of simulated drought on pore water chemistry of peatlands.
abstract: Northern peatlands are increasingly threatened by climate change and industrial activities. This study examined the impact of simulated droughts on pore water chemistry at six peatlands in Sudbury, Ontario, that differ in copper (Cu), nickel (Ni) and cobalt (Co) contamination, including a site that had been previously limed. All sites responded similarly to simulated drought: pore water pH declined significantly following the 30 day drought and the decline was greater following the 60 day drought treatment. The decline in pore water pH was due to increasing sulphate concentrations, whereas nitrate increased more in the 60 day drought treatment. Decreases in pH were accompanied by large increases in Ni and Co that greatly exceeded provincial water quality guidelines. In contrast, dissolved organic carbon (DOC) concentrations decreased significantly following drought, along with concentrations of Cu and Al, which are strongly complexed by organic acids.
authors.affiliation: Environmental and Resource Studies Department, Trent University, 1600 West Bank Drive, Peterborough, ON K9J 7B8, Canada. Electronic address: myrajuckers@trentu.ca.
authors.forename: Myra
authors.initials: M
authors.lastname: Juckers
authors.forename: Shaun A
authors.initials: SA
authors.lastname: Watmough
mesh_terms: D057231:Climate Change; D055864:Droughts; D060587:Groundwater / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D008670:Metals / Q000032:analysis; D009864:Ontario; D013431:Sulfates / Q000032:analysis; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D008670:Metals; D013431:Sulfates; D014874:Water Pollutants, Chemical
keywords: Drought; Liming; Metals; Nitrate; Peatland acidification