Abstract
Elevated CO2 and O3 alter tree quality and the quality of herbivore inputs, such as frass, to forest soil. Altered quality or quantity of herbivore inputs to the forest floor can have large impacts on belowground processes. We collected green leaves and frass from whitemarked tussock moth caterpillars from aspen-birch stands at the Aspen Free Air CO2 Enrichment (FACE) site near Rhinelander, WI, USA. Small or large quantities of frass, greenfall, or a 1:1 ratio of frass and greenfall were added to microcosms for each FACE treatment (control, +CO2, +O3, +CO2+O3). We measured initial frass and greenfall quality, and recorded microbial respiration, and nitrate leaching over 40 days. Elevated carbon dioxide (eCO2) and tropospheric ozone (eO3) significantly altered the carbon, nitrogen, and condensed tannin content of insect frass and green leaves. Although FACE treatments affected input quality, they had minimal effect on microbial respiration and no effect on nitrogen leaching. In contrast, input quantity substantially influenced microbial respiration and nitrate leaching. Respiratory carbon loss and nitrate immobilization were nearly double in microcosms receiving large amounts of herbivore inputs than those receiving no herbivore inputs. Small amounts of herbivore inputs, however, did not significantly alter microbial respiration or immobilization, suggesting that effects of herbivore inputs on soil processes will be detected only at moderate to high herbivory/input levels. These results suggest that subtle changes in frass and greenfall quality may not affect soil nutrient cycling. In contrast, environmental change induced increases in insect population size or frass and greenfall inputs to the soil may substantially impact nutrient cycling.
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Acknowledgments
Aspen FACE is principally supported by the Office of Science (BER), U.S. Department of Energy, Grant No. DE-FG02-95ER62125 to Michigan Technological University, and Contract No. DE-AC02-98CH10886 to Brookhaven National Laboratory, the U.S. Forest Service Northern Global Change Program and North Central Research Station, Michigan Technological University, and Natural Resources Canada—Canadian Forest Service. We thank the members of the Lindroth Lab, especially Mike Madritch, for input into study design and lab techniques, Adam Gusse and Andy Vogelzang for help raising whitemarked tussock moth larvae, and Leanne Vigue for collecting senesced leaves from the Aspen FACE site. We also thank the two anonymous reviewers for their helpful comments on the manuscript. This work was supported by U.S. Department of Energy (Office of Science, BER) grant DE-FG02-06ER64232, and University of Wisconsin Hatch grant WIS04898 to R.L. Lindroth.
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Hillstrom, M., Meehan, T.D., Kelly, K. et al. Soil carbon and nitrogen mineralization following deposition of insect frass and greenfall from forests under elevated CO2 and O3 . Plant Soil 336, 75–85 (2010). https://doi.org/10.1007/s11104-010-0449-4
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DOI: https://doi.org/10.1007/s11104-010-0449-4