Abstract
The future capacity of forest ecosystems to sequester atmospheric carbon is likely to be influenced by CO2-mediated shifts in nutrient cycling through changes in litter chemistry, and by interactions with pollutants like O3. We evaluated the independent and interactive effects of elevated CO2 (560 μl l−1) and O3 (55 nl l l−1) on leaf litter decomposition in trembling aspen (Populus tremuloides) and paper birch (Betula papyrifera) at the Aspen free air CO2 enrichment (FACE) site (Wisconsin, USA). Fumigation treatments consisted of replicated ambient, +CO2, +O3, and +CO2 + O3 FACE rings. We followed mass loss and litter chemistry over 23 months, using reciprocally transplanted litterbags to separate substrate quality from environment effects. Aspen decayed more slowly than birch across all treatment conditions, and changes in decomposition dynamics of both species were driven by shifts in substrate quality rather than by fumigation environment. Aspen litter produced under elevated CO2 decayed more slowly than litter produced under ambient CO2, and this effect was exacerbated by elevated O3. Similarly, birch litter produced under elevated CO2 also decayed more slowly than litter produced under ambient CO2. In contrast to results for aspen, however, elevated O3 accelerated birch decay under ambient CO2, but decelerated decay under enriched CO2. Changes in decomposition rates (k-values) were due to CO2- and O3-mediated shifts in litter quality, particularly levels of carbohydrates, nitrogen, and tannins. These results suggest that in early-successional forests of the future, elevated concentrations of CO2 will likely reduce leaf litter decomposition, although the magnitude of effect will vary among species and in response to interactions with tropospheric O3.
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Acknowledgments
Research funds were provided by a US Department of Energy grant (DE-FG02-98ER62680) to RLL and JGB, and a US Department of Agriculture grant (NRI 95-37302-1810) to RLL. Aspen FACE is supported principally by the Office of Science (BER), US Department of Energy (DE-FG02-95ER62125), the US Forest Service Northern Global Change Program and North Central Research Station, Michigan Technological University, and Natural Resources Canada—Canadian Forest Service. We thank the Aspen-FACE steering committee and site operators, Jaak Sôber and Scott Jacobsen, for providing access to the facility. For their help in collecting, processing, and analyzing litter, we thank Adam Gusse, and especially Heidi Barnhill, who rode herd on our army of undergraduate assistants (Daniel Beisner, Michael Drews, Beth Kazlauskas, Kari Klasen, Kelly Krein, Nasuh Malas, Melissa Naub, Laura Riel, Joshua Rudinsky, Lindsay Wieczorek, Sarah Wood, and Kathryn Zachman). We thank Matthias Jaime for creating the figures. Edward Rastetter and two anonymous reviewers provided helpful reviews of the manuscript.
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Parsons, W.F.J., Bockheim, J.G. & Lindroth, R.L. Independent, Interactive, and Species-Specific Responses of Leaf Litter Decomposition to Elevated CO2 and O3 in a Northern Hardwood Forest. Ecosystems 11, 505–519 (2008). https://doi.org/10.1007/s10021-008-9148-x
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DOI: https://doi.org/10.1007/s10021-008-9148-x