Abstract
Tussock-forming plants are globally widespread and enhance ecosystem services. We hypothesized that tussocks of Carex stricta store carbon (C) in addition to enhancing microtopography and biodiversity. We characterized tussock size, composition, and carbon pools associated with three undisturbed C. stricta-dominated tussock meadows in the Upper Midwest, USA. Remnant meadow tussocks were tall (17.2 cm), voluminous (4,113 cm3), and largely organic (95 %), indicating their ability to accumulate organic matter and store carbon. Tussocks were the second largest C pool (next to soil) in these ecosystems; they comprised 41–62 % of total biomass C. Using bomb 14C dating, we estimated that reference-site tussocks were over 50 years old. Their long-term persistence is consistent with lower leaf decomposition rates on tussocks (k = 0.26 years−1) than in tussock interspaces (k = 0.39 years−1). An urban tussock meadow had tussocks that were shorter than those of remnant sites, but less dense than a restored meadow. The restored meadow (≤15 years) had smaller, structurally distinct tussocks that stored less C. Among the five sites, C stocks were lowest in the urban and restored meadows, supporting the need to conserve existing C stores in remnant meadows and to restore tussock sedge for multiple ecosystem services.
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Acknowledgments
We thank the UW-Madison Arboretum, Cherokee Marsh Conservation Park, Wisconsin DNR State Natural Areas, and Wetlands Research, Inc. for access to research sites. Research was supported in part by a NSF Doctoral Dissertation Improvement Grant (#0909933) and an ON and EK Allen Fellowship to BAL. We thank Julia Caldwell, Sally Gallagher, James Doherty, and Chun Ma for field and laboratory assistance. Timothy Fahey, Randy Jackson, and Chris Kucharik generously provided advice and access to their equipment; Kandis Elliot improved Figure 1.
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Lawrence, B.A., Zedler, J.B. Carbon Storage by Carex stricta Tussocks: A Restorable Ecosystem Service?. Wetlands 33, 483–493 (2013). https://doi.org/10.1007/s13157-013-0405-1
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DOI: https://doi.org/10.1007/s13157-013-0405-1