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| Titel |
Impact of forest harvesting on water quality and fluorescence characteristics of dissolved organic matter in eastern Canadian Boreal Shield lakes in summer |
| VerfasserIn |
P. Glaz, J.-P. Gagné, P. Archambault, P. Sirois, C. Nozais |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 12, no. 23 ; Nr. 12, no. 23 (2015-12-07), S.6999-7011 |
| Datensatznummer |
250118195
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| Publikation (Nr.) |
 copernicus.org/bg-12-6999-2015.pdf |
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| Zusammenfassung |
| Forestry activities in the Canadian Boreal region have increased in the last
decades, raising concerns about their potential impact on aquatic ecosystems.
Water quality and fluorescence characteristics of dissolved organic matter
(DOM) were measured over a 3-year period in eight eastern Boreal Shield
lakes: four lakes were studied before, 1 and 2 years after forest
harvesting (perturbed lakes) and compared with four undisturbed reference
lakes (unperturbed lakes) sampled at the same time. ANOVAs showed a
significant increase in total phosphorus (TP) in perturbed lakes when the
three sampling dates were considered and in DOC concentrations when
considering 1 year before and 1 year after the perturbation only. At 1 year post-clear cutting DOC concentrations were about 15 % greater in the
perturbed lakes at ~ 15 mgC L−1 compared to 12.5 mgC L−1
in the unperturbed lakes. In contrast, absorbance and fluorescence
measurements showed that all metrics remained within narrow ranges compared
to the range observed in natural waters, indicating that forest harvesting
did not affect the nature of DOM characterized with spectroscopic techniques.
These results confirm an impact of forestry activities 1 year after the
perturbation. However, this effect seems to be mitigated 2 years after,
indicating that the system shows high resilience and may be able to return to
its original condition in terms of water quality parameters assessed in this
study. |
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