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Effects of Elevated Atmospheric $CO_2$ on Wetland Plants: A Review  

Kim, Seon-Young (Department of Environmental Science and Engineering, Ewha Womans University)
Kang, Ho-Jeong (Department of Environmental Science and Engineering, Ewha Womans University)
Publication Information
Korean Journal of Ecology and Environment / v.36, no.4, 2003 , pp. 391-402 More about this Journal
Abstract
Last 20 years have witnessed many studies dealing with effects of elevated $CO_2$ on terrestrial ecosystems. However, fewer efforts have been made to elucidate effects on wetland ecosystems, although they play a key role in global biogeochemical cycles. This review synthesizes published data to reveal effects of elevated $CO_2$ on wetland plants. In particular, we focused on the changes in primary production, community structures, evapotranspiration, and nutrients in plants. Many studies have reported increases in primary production in individual plants, but we could not conclude that this will lead to increases in carbon sequestration in wetland ecosystems. The reasons include transport of photosynthates into belowground parts, speciesspecific responses, interaction among different species, and limitation of other nutrients. However, elevated $CO_2$ increased transpiration rates in many wetland plants, suggesting substantial influences on water budgets of wetlands. In addition, similar to terrestrial ecosystems, elevated $CO_2$ increased C/N ratio of many plants, which may impede organic matter decomposition in the long term. However, further information on dynamics of belowground carbon supplied from wetland plants is warranted to assess effects of elevated $CO_2$ on wetland carbon cycle accurately.
Keywords
wetland; elevated $CO_2$; Vegetation; photosynthesis; peatland;
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