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Abstract Sugar maple (Acer saccharum Marsh.)-dominated northern hardwood forests of the Great Lakes Region commonly receive elevated levels of atmospheric nitrate (NO 3− ) deposition, which can alter belowground carbon (C) cycling. Past research has demonstrated that chronic experimental NO 3− deposition (3 g N m−2 y−1 above ambient) elicits a threefold increase in the leaching...
In forests of the Great Lakes region, experimental NO3− deposition has suppressed soil respiration and enhanced DOC export. Reasons for these responses are unknown, but they could arise via two alternatives: (i) direct suppression of microbial activity by NO3− or (ii) indirect suppression of the microbial community via changes in litter biochemistry in response to greater N availability. To test the...
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