Title Variable flushing mechanisms and landscape structure control stream DOC export during snowmelt in a set of nested catchments
Author Pacific, V.J.; Jencso, K.G.; McGlynn, B.L.
Author Affil Pacific, V.J., Montana State University, Department of Land Resources and Environmental Sciences, Bozeman, MT
Source Biogeochemistry (Dordrecht), 99(1-3), p.193-211, . Publisher: Springer, Dordrecht - Boston - Lancaster, International. ISSN: 0168- 2563
Publication Date July 2010
Notes In English. 44 refs. GeoRef Acc. No: 310430
Index Terms aerial surveys; airborne radar; precipitation (meteorology); chemical analysis; river basins; geochemical cycles; geochemistry; geomorphology; geophysical surveys; hydrogeochemistry; hydrology; lasers; lidar; meltwater; radar; surface waters; surveys; United States--Montana-- Little Belt Mountains; airborne methods; atmospheric precipitation; biochemistry; Bubbling Creek; carbon; carbon cycle; connectivity; drainage basins; geochemical cycle; geophysical methods; hydrochemistry; landform evolution; landscapes; laser methods; lidar methods; Little Belt Mountains; mobilization; Montana; North America; organic carbon; radar methods; riparian environment; rivers and streams; Rocky Mountains; soil flushing; Spring Park Creek; Stringer Creek; Sun Creek; surface water; Tenderfoot Creek; U. S. Rocky Mountains; United States; uplands
Abstract Stream DOC dynamics during snowmelt have been the focus of much research, and numerous DOC mobilization and delivery mechanisms from riparian and upland areas have been proposed. However, landscape structure controls on DOC export from riparian and upland landscape elements remains poorly understood. We investigated stream and groundwater DOC dynamics across three transects and seven adjacent but diverse catchments with a range of landscape characteristics during snowmelt (April 15- July 15) in the northern Rocky Mountains, Montana. We observed a range of DOC export dynamics across riparian and upland landscape settings and varying degrees of hydrologic connectivity between the stream, riparian, and upland zones. DOC export from riparian zones required a hydrologic connection across the riparian-stream interface, and occurred at landscape positions with a wide range of upslope accumulated area (UAA) and wetness status. In contrast, mobilization of DOC from the uplands appeared restricted to areas with a hydrologic connection across the entire upland-riparian-stream continuum, which generally occurred only at areas with high UAA, and/or at times of high wetness. Further, the relative extent of DOC-rich riparian and wetland zones strongly influenced catchment DOC export. Cumulative stream DOC export was highest from catchments with a large proportion of riparian to upland area, and ranged from 6.3 to 12.4 kg ha-1 across the study period. This research suggests that the spatial/temporal intersection of hydrologic connectivity and DOC source areas drives stream DOC export. Copyright 2010 Springer Science+Business Media B.V.
URL http://hdl.handle.net/10.1007/s10533-009-9401-1
Publication Type journal article
Record ID 65007167