HR: 1340h
AN: B33D-1067    [Abstracts]
TI: Land-water movement of dissolved organic matter in watersheds: hydroclimatic controls and environmental implications
AU: * Park, J
EM: jihyungpark@yahoo.com
AF: Gwangju Institute of Sci & Tech, 1 Oryong-dong, Gwangju, 500-712 Korea, Republic of
AU: Mitchell, M J
B33D-1067 AF: SUNY-ESF, 1 Forestry Dr., Syracuse, NY 13210 United States
AU: Kang, S
B33D-1067 AF: Gwangju Institute of Sci & Tech, 1 Oryong-dong, Gwangju, 500-712 Korea, Republic of
AU: Kang, S
B33D-1067 AF: Gwangju Institute of Sci & Tech, 1 Oryong-dong, Gwangju, 500-712 Korea, Republic of
AU: Kim, S
B33D-1067 AF: Gwangju Institute of Sci & Tech, 1 Oryong-dong, Gwangju, 500-712 Korea, Republic of
AU: Lee, J
B33D-1067 AF: Gwangju Institute of Sci & Tech, 1 Oryong-dong, Gwangju, 500-712 Korea, Republic of
AB: Dissolved organic matter (DOM) in soils and surface waters plays a crucial role in transporting carbon, nutrients, and trace toxic contaminants through different watershed compartments. The coupling between hydrology and DOM movement from land to water has been a central theme of many hydro-biogeochemical studies at the watershed level. We compared hydroclimatic controls on the movement of DOM and some trace contaminants in two temperate watersheds having idiosyncratic seasonal patterns of precipitation and runoff. In Arbutus Watershed in the Adirondacks of New York State, stream discharge from December through April represented over 60% of the annual runoff. Stochastic snowmelt events during the winter, triggered by elevated air temperatures, resulted in concurrent increases in the stream water concentrations of DOM, H+, and total dissolved Al. In Hwang-Ryong River Watershed, which is located in the southwestern Korean Peninsula and encompasses forested, rural, and urban landscapes in sequence, frequent heavy rainfalls during the summer monsoon were targeted as a biogeochemical hot event. Preliminary results suggest that spectroscopic properties of DOM, along with concentrations of trace metals, change with an increasing influence of urban wastewater, with different hydroclimatic impacts at upstream and downstream sites. Implications of the coupling between hydrology and biogeochemical transport for watershed environmental quality will be discussed, especially in relation to watershed biogeochemical responses to climatic variability.
DE: 0414 Biogeochemical cycles, processes, and modeling (0412, 0793, 1615, 4805, 4912)
DE: 0428 Carbon cycling (4806)
DE: 0432 Contaminant and organic biogeochemistry (0792)
DE: 0439 Ecosystems, structure and dynamics (4815)
DE: 0489 Trace element cycling (4875)
SC: Biogeosciences [B]
MN: Fall Meeting 2005