Abstract
Ecologists have long used stream water chemistry records to infer hillslope processes, although a great deal of biogeochemical processing of soil water is known to occur both downslope and in-stream. We report the effects of forest succession on C and N export in the west central Cascades of Oregon, a region of low anthropogenic N input. In a previous study, watersheds with forests of differing ages showed a number of significant differences in stream nutrient export. This study was intended to establish whether differences in stream chemistry were due to variation in N retention by forests of different ages, and thus we measured C and N in lysimeter water draining 12 forest plots, which were categorized into four different stages of successional development. Mean total dissolved nitrogen (TDN) concentrations in deep soil solutions were 2.5 times higher than stream water TDN observed in the previous study, suggesting that denitrification and/or N uptake occurred in the streams or the riparian zone. Although there was a trend for highest soil solution N concentrations in the second youngest (stem exclusion) stage, this trend was significant only for NH4-N. We previously found that streamwater NO3-N concentrations averaged 46% of TDN export and was significantly higher in the young than in the older watersheds, however, soil solution NO3-N concentration averaged 2% of TDN concentration and did not vary with succession. Although NH4-N concentrations were very low (~5 μg L−1) in stream water, NH4-N in lysimeter samples averaged 35% of TDN. While stream water dissolved organic nitrogen (DON) concentrations averaged 30% of TDN concentrations, soil solution DON concentrations averaged 64% of TDN concentration; neither varied with succession. Even with sharp differences in both forest floor and mineral soil C:N ratios and C contents among plots, no measure of N export from the forest stands was significantly related to forest floor or mineral soil characteristics. This is most likely because forest floor C:N ratios all greatly exceeded the reported low C:N ratios required to allow significant N leakage. Taken together, these results suggest that riparian dynamics, in-stream processing, or perhaps even the presence of near-stream alders significantly alter concentrations of all N species between the soil solution and stream water.
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Acknowledgements
Many thanks are due to Candace Banners, Tammi Connolly, Susan Crow, Joe Greene, Gail Heine, Steven Jett, Mark Johnson, Kambra Morris, Kathy Motter, Jason Myers, Dana Nagy, Gail Oberst, Lela Rangan, Christine Redmond, Sue Reitel, Cristy Rodriguez, Tamotsu Shiroyama, Allen Solomon, Dave Tingey, and Trevor Wright for their hard work in helping to collect and analyze soil, water and wood samples. Particular praise is due to Jana Compton, Denise Hoffert-Hay, and Ray Seidler for their sampling assistance as well as their endless hours of time spent consulting on this project. Finally, we thank the staffs at the Willamette National Forest Service Sweet Home Ranger District and Cascade Timber Consultants, Inc. for plot access permission and sharing forest stand histories.
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Cairns, M.A., Lajtha, K. & Beedlow, P.A. Dissolved carbon and nitrogen losses from forests of the Oregon Cascades over a successional gradient. Plant Soil 318, 185–196 (2009). https://doi.org/10.1007/s11104-008-9828-5
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DOI: https://doi.org/10.1007/s11104-008-9828-5