Testing the stability of carbon pools stored in tussock sedge meadows |
| |
| Affiliation: | 1. Department of Botany, University of Wisconsin-Madison, USA;2. Department of Agronomy, University of Wisconsin-Madison, USA;3. DOE-Great Lakes Bioenergy Research Center, University of Wisconsin-Madison, USA;4. Center for Sustainability and the Global Environment, University of Wisconsin-Madison, USA;1. Departament of Environmental Sciences (DCAm), Federal University of São Carols, CP 676, São Carlos, SP 13565-905, Brazil;2. Graduate Program in Ecology and Natural Resources, Federal University of São Carlos, CP 676, São Carlos, SP 13565-905, Brazil;1. Departamento de Ecología y Biología Animal, Universidad de Vigo, 36310 Vigo, Spain;2. Institute of Environmental Sciences CML, Leiden University, The Netherlands;3. Department of Systems Ecology, Faculty of Earth and Life Sciences, VU University, Amsterdam, The Netherlands;4. Departamento de Biología Vegetal y Ciencias del Suelo, Universidad de Vigo, 36310 Vigo, Spain;1. Department of Aquatic Ecology, Eawag, Dübendorf, Switzerland;2. Université des Sciences et Techniques de Franche-Comté, Besançon, France;3. Department of Experimental Limnology, Leibniz Institute of Freshwater Ecology and Inland Fisheries (IGB), Stechlin, Germany;4. Department of Environmental Science, ETH, Zurich, Switzerland;5. Department of Ecology, Berlin Institute of Technology (TU Berlin), Berlin, Germany;1. School of Nature Conservation, Beijing Forestry University, Beijing, 100083, China;2. Sichuan Academy of Forestry, Chengdu, 610081, China;3. Institute of Wetland Ecology & Clone Ecology, Taizhou University, Taizhou, 318000, Zhejiang, China;4. Zhejiang Provincial Key Laboratory of Plant Evolutionary Ecology and Conservation, Taizhou University, Taizhou, 318000, Zhejiang, China |
| |
| Abstract: | Tussocks formed by Carex stricta are a relatively large carbon (C) pool in sedge meadows, but the stability of organic matter in these ecosystems is not well understood. We initiated year-long incubation experiments (22.5 °C) to evaluate the CO2 and CH4 production potentials of sedge meadow substrates under field moist and inundated treatments from five sites in the Upper Midwest, USA (4 reference, 1 restored). C mineralization potentials decreased with depth (tussocks > underlying soil), and were positively correlated with macro-organic matter content and negatively with lignin. Across sites, C stored in tussocks and soil at the restoration was the least stable, suggesting that the restoration of C-storage function may take decades. Mineralization potentials were similar between field moist and inundated treatments, but inundation resulted in higher methane production, accounting for 24–51% of total carbon mineralized from tussocks. In the field however, C. stricta tussocks emitted less methane (393 ± 76 mg CH4 m−2 d−1) than tussock interspaces (1362 ± 371 mg CH4 m−2 d−1) early in the growing season; we suggest that tussock tops oxidized methane produced from deeper anoxic horizons. Our results highlight the importance of considering how microtopography modulates greenhouse gas flux from wetlands and suggests that the C stored in the older, more decomposed C. stricta tussock sedge meadow substrates (both within and between sites) is relatively stable. |
| |
| Keywords: | C mineralization Incubation Methane Restoration Wetland |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
