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| Titel |
Impacts of tropical cyclones on hydrochemistry of a subtropical forest |
| VerfasserIn |
C. T. Chang, S. P. Hamburg, J. L. Hwong, N. H. Lin, M. L. Hsueh, M. C. Chen, T. C. Lin |
| 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 ; 17, no. 10 ; Nr. 17, no. 10 (2013-10-07), S.3815-3826 |
| Datensatznummer |
250085947
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| Publikation (Nr.) |
 copernicus.org/hess-17-3815-2013.pdf |
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| Zusammenfassung |
Tropical cyclones (typhoons/hurricanes) have major
impacts on the biogeochemistry of forest ecosystems, but the stochastic
nature and the long intervals between storms means that there are limited
data on their effects. We characterised the impacts of 14 typhoons over six
years on hydrochemistry of a subtropical forest plantation in Taiwan, a
region experiencing frequent typhoons. Typhoons contributed 1/3 of the annual
rainfall on average, but ranged from 4 to 55%. The stochastic nature
of annual typhoon related precipitation poses a challenge with respect to
managing the impacts of these extreme events. This challenge is exacerbated
by the fact that typhoon-related rainfall is not significantly correlated
with wind velocity, the current focus of weather forecasts. Thus, little
advance warning is provided for the hydrological impacts of these storms.
The typhoons we studied contributed approximately one third of the annual
input and output of most nutrients (except nitrogen) during an average 9.5 day yr−1
period, resulting in nutrient input/output rates an order of
magnitude greater than during non-typhoon months. Nitrate output balanced
input during the non-typhoon period, but during the typhoon period an
average of 10 kg ha−1 yr−1 nitrate was lost. Streamwater chemistry
exhibited similarly high variability during typhoon and non-typhoon periods
and returned to pre-typhoon levels one to three weeks following each
typhoon. The streamwater chemistry appears to be very resilient in response
to typhoons, resulting in minimal loss of nutrients. |
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