at Google ScholarTitle data
Alewell, Christine ; Mitchell, Myron J. ; Likens, Gene E. ; Krouse, H. Roy:
Sources of stream sulfate at the Hubbard Brook Experimental forest : long-term analysis using stable isotopes.
In: Biogeochemistry.
Vol. 44
(1999)
.
- pp. 281-299.
ISSN 1573-515X
DOI: https://doi.org/10.1023/A:1006058913822
Abstract in another language
Sulfur deposition in the northeastern U.S. has been decreasing since the 1970s and there has been a concomitant decrease in the SO42- lost from drainage waters from forest catchments of this region. It has been established previously that the SO42- lost from drainage waters exceeds SO42- inputs in bulk precipitation, but the cause for this imbalance has not been resolved. The use of stable S isotopes and the availability of archived bulk precipitation and stream water samples at the Hubbard Brook Experimental Forest (HBEF) in New Hampshire provided a unique opportunity to evaluate potential sources and sinks of S by analyzing the long-term patterns (1966-1994) of the d34S values of SO42- . In bulk precipitation adjacent to the Ecosystem Laboratory and near Watershed 6 the d34S values were greater (mean: 4.5 and 4.2l, respectively) and showed more variation (variance: 0.49 and 0.30) than stream samples from Watersheds 5 (W5) and 6 (W6) (mean: 3.2 and 3.7; variance: 0.09 and 0.08, respectively). These results are consistent with other studies in forest catchments that have combined results for mass balances with stable S isotopes. These results indicate that for those sites, including the HBEF, where atmospheric inputs are -1 yr-1 , most of the deposited SO42- cycles through the biomass before it is released to stream water. Results from W5, which had a whole-tree harvest in 1983-1984 showed that adsorption/desorption processes play an important role in regulating net SO42- retention for this watershed-ecosystem. Although the isotopic results suggest the importance of S mineralization, conclusive evidence that there is net mineralization has not yet been shown. However, S mass balances and the isotopic result are consistent with the mineralization of organic S being a major contributor to the SO42- in stream waters at the HBEF.
Further data
| Item Type: | Article in a journal |
|---|---|
| Refereed: | Yes |
| Additional notes: | BAYCEER7238 |
| Institutions of the University: | Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Chair Soil Ecology Research Institutions > Central research institutes > Bayreuth Center of Ecology and Environmental Research- BayCEER Faculties Faculties > Faculty of Biology, Chemistry and Earth Sciences Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences Research Institutions Research Institutions > Central research institutes |
| Result of work at the UBT: | Yes |
| DDC Subjects: | 500 Science |
| Date Deposited: | 09 Oct 2015 05:56 |
| Last Modified: | 28 Oct 2024 12:59 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/20292 |