Effects of sulfate deposition on pore water dissolved organic carbon,nutrients, and microbial enzyme activities in a northern peatland |
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| Institution: | 1. Integrated Biosciences Graduate Program, University of Minnesota, 251 Swenson Science Building, 1035 Kirby Drive, Duluth, MN 55812, USA;2. U.S. Environmental Protection Agency, Office of Research and Development, National Health and Environmental Effects Research Laboratory, Mid-Continent Ecology Division, 6201 Congdon Boulevard, Duluth, MN 55894, USA;3. U.S. Forest Service, Northern Research Station, Center for Research on Ecosystem Change, 1831 Highway 169 East, Grand Rapids, MN 55744, USA;1. Department of Rural and Bio-systems Engineering (BK 21), Chonnam National University, Gwangju, 61186, Republic of Korea;2. National Institute of Agricultural Sciences, Wanju, Jeollabuk-do, 55365, Republic of Korea;3. AgriBio Institute of Climate Change Management, Chonnam National University, Gwangju, 61186, Republic of Korea;4. National Institute of Crop Sciences, Wanju, Jeollabuk-do, 55365, Republic of Korea;5. Department of Rural Construction Engineering, Jeonbuk National University, Jeonju, Jeollabuk-do, 57896, Republic of Korea;6. National Instrumentation Center for Environmental Management, Seoul National University, Seoul, 08826, Republic of Korea;7. Bio R&D Center, CJ Cheiljedang, Suwon, Gyeonggi-do, 16495, Republic of Korea;1. Institute for Ecology and Landscape, University of Applied Sciences Weihenstephan−Triesdorf, Am Staudengarten 1, 85354, Freising, Germany;2. Institute for Agricultural Engineering and Animal Husbandry, Bavarian State Research Center for Agriculture, Am Staudengarten, 3, 85354, Freising, Germany;3. Institute for Ecology and Landscape, University of Applied Sciences Weihenstephan−Triesdorf, Am Hofgarten 1, 85354, Freising, Germany;4. Biogenic Polymers, Technische Universität München, Campus Straubing for Biotechnology and Sustainability, Schulgasse 16, 94315, Straubing, Germany |
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| Abstract: | Export of dissolved organic carbon from lakes and streams has increased throughout Europe and North America over the past several decades. One possible cause is altered deposition chemistry; specifically, decreasing sulfate inputs leading to changes in ionic strength and dissolved organic carbon solubility. To further investigate the relationship between deposition chemistry and dissolved organic carbon export in peatlands, a field experiment was conducted to compare the pore water chemistry and peat microbial enzyme activity of mesocosms receiving sulfate amendments to mesocosms receiving no additions. To consider how peatlands respond during recovery from increased inputs of sulfate, samples were also analyzed from an area of the same peatland that was previously amended with sulfate. Current additions of sulfate decreased dissolved organic carbon concentration and increased dissolved organic carbon aromaticity. Total dissolved phosphorus decreased in response to current sulfate amendments but was elevated in the area of the peatland recovering from sulfate amendment. The total dissolved phosphorus increase, which was reflected in microbial enzyme activity, may have shifted the system from P limitation to N limitation. This shift could have important consequences for ecosystem processes related to plant and microbial communities. It also suggests that the recovery from previous sulfate amendments may take longer than may be expected. |
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| Keywords: | Atmospheric deposition Dissolved organic carbon Peatland Phosphorus Microbial enzyme activity |
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