Environmental and Resource Studies Department, Trent University, 1600 West Bank Drive, Peterborough, ON K9J 7B8, Canada.
Environ Pollut. 2014 Jan;184:73-80. doi: 10.1016/j.envpol.2013.08.011. Epub 2013 Sep 13.
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.
北方泥炭地正日益受到气候变化和工业活动的威胁。本研究调查了模拟干旱对安大略省萨德伯里六个泥炭地孔隙水化学的影响，这些泥炭地在铜（Cu）、镍（Ni）和钴（Co）污染方面存在差异，包括一个以前曾进行过石灰处理的地点。所有地点对模拟干旱的反应相似：在 30 天干旱后，孔隙水 pH 值显著下降，而在 60 天干旱处理后，下降幅度更大。孔隙水 pH 值的下降是由于硫酸盐浓度的增加，而硝酸盐在 60 天干旱处理中增加得更多。pH 值的下降伴随着 Ni 和 Co 的大幅增加，远远超过了省级水质指南。相比之下，干旱后溶解有机碳（DOC）浓度以及与有机酸强烈络合的 Cu 和 Al 浓度显著下降。
