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| Titel |
The effects of cumulative forest disturbance on streamflow in a large watershed in the central interior of British Columbia, Canada |
| VerfasserIn |
M. Zhang, X. Wei |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 16, no. 7 ; Nr. 16, no. 7 (2012-07-11), S.2021-2034 |
| Datensatznummer |
250013362
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| Publikation (Nr.) |
 copernicus.org/hess-16-2021-2012.pdf |
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| Zusammenfassung |
| The Baker Creek watershed (1570 km2), situated in the central interior
of British Columbia, Canada, has been severely disturbed by both logging and
natural disturbance, particularly by a recent large-scale mountain pine
beetle (MPB) infestation (up to 2009, 70.2% of the watershed area had
been attacked by MPB) and subsequent salvage logging. The concept of equivalent
clear-cut area (ECA) was used to indicate the magnitude of forest
disturbance, with consideration of hydrological recovery following various
types of disturbance (wildfire, logging and MPB infestation), cumulated over
space and time in the watershed. The cumulative ECA peaked at 62.2% in
2009. A combined approach of statistical analysis (i.e. time series
analysis) and graphic method (modified double mass curve) was employed to
evaluate the impacts of forest disturbance on hydrology. Our results showed
that severe forest disturbance significantly increased annual mean flow. The
average increment in annual mean flow caused by forest disturbance was 48.4 mm yr−1,
while the average decrease in annual mean flow caused by climatic
variability during the same disturbance period was 35.5 mm yr−1. The opposite
changes in directions and magnitudes clearly suggest an offsetting effect
between forest disturbance and climatic variability, with the absolute
influential strength of forest disturbance (57.7%) overriding that from
climate variability (42.3%). Forest disturbance also produced
significant positive effects on low flow and dry season (fall and winter)
mean flow. Implications of our findings for future forest and water
resources management are discussed in the context of long-term watershed
sustainability. |
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