Details

Autor(en) / Beteiligte

• BERNHARDT, EMILY S
• LIKENS, GENE E
• HALL, ROBERT O
• BUSO, DON C
• FISHER, STUART G
• BURTON, THOMAS M
• MEYER, JUDY L
• MCDOWELL, WILLIAM H
• MAYER, MARILYN S
• BOWDEN, W. BRECK
• FINDLAY, STUART E. G
• MACNEALE, KATE H
• STELZER, ROBERT S
• LOWE, WINSOR H

Titel

Can't See the Forest for the Stream? In-stream Processing and Terrestrial Nitrogen Exports

Ist Teil von

• Bioscience, 2005-03, Vol.55 (3), p.219-230

Ort / Verlag

Circulation, AIBS, 1313 Dolley Madison Blvd., Suite 402, McLean, VA 22101. USA: American Institute of Biological Sciences

Erscheinungsjahr

2005

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• There has been a long-term decline in nitrate (NO3−) concentration and export from several long-term monitoring watersheds in New England that cannot be explained by current terrestrial ecosystem models. A number of potential causes for this nitrogen (N) decline have been suggested, including changes in atmospheric chemistry, insect outbreaks, soil frost, and interannual climate fluctuations. In-stream removal of NO3− has not been included in current attempts to explain this regional decline in watershed NO3− export, yet streams may have high removal rates of NO3−. We make use of 40 years of data on watershed N export and stream N biogeochemistry from the Hubbard Brook Experimental Forest (HBEF) to determine (a) whether there have been changes in HBEF stream N cycling over the last four decades and (b) whether these changes are of sufficient magnitude to help explain a substantial proportion of the unexplained regional decline in NO3− export. Examining how the tempos and modes of change are distinct for upland forest and stream ecosystems is a necessary step for improving predictions of watershed exports.