HR: 1330h
AN: B32B-0381    [PDF]
TI: Effects of Nitrogen Fertilization and Elevated [CO$_{2}$] on Wetland Biogeochemistry
AU: * Kim, S
EM: ecosun0@hotmail.com
AF: Department of Environmental Science and Engineering, Ewha Womans University, 11-1 Seodaemoongu, Seoul, 120-750 Korea, Republic of
AU: Kang, H
EM: hjkang@ewha.ac.kr
AF: Department of Environmental Science and Engineering, Ewha Womans University, 11-1 Seodaemoongu, Seoul, 120-750 Korea, Republic of
AB: Effects of nitrogen (N) fertilization and elevated [CO$_{2}$] on plant growth, microbial activity, and emission of greenhouse gases were assessed using wetland plants (7 species) grown with 2 levels of nitrogen and 2 levels of CO$_{2}$ in growth chambers. After 110 days, N fertilization increased shoot biomass by 12.6 $\sim$ 105.0 %, whereas such response was absent for root growth ({\it P}$>$0.1). Elevated [CO$_{2}$] increased shoot length, but responses to shoot and root biomass were species-specific. Arylsulfatase, $\beta$-glucosidase, {\it N}-acetylglucosaminidase activities in soil were increased by elevated [CO$_{2}$], but reduced enzyme activity under N fertilization was observed. Both N fertilization and elevated [CO$_{2}$] increased the quantity of phenolic material and dissolved organic carbon (DOC) in soil. We found elevated [CO$_{2}$] decreased soil respiration, while nitrogen enrichment led to an increase of soil respiration. CH$_{4}$ emission exhibited no general trends for each treatment or plant species. However, CH$_{4}$ emission of {\it phragmite communis} under elevated [CO$_{2}$] was significantly higher (29.5 $\mu$mol kg$^{-} $) than that of control (2.3 $\mu$mol kg$^{-} $).
DE: 0614 Biological effects
DE: 1615 Biogeochemical processes (4805)
DE: 1851 Plant ecology
DE: 1890 Wetlands
DE: 4840 Microbiology
SC: Biogeosciences [B]
MN: 2003 Fall Meeting