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| Titel |
Evaluation of regional acid sensitivity predictions using field data: issues of scale and heterogeneity |
| VerfasserIn |
B. Reynolds, C. Neal, D. A. Norris |
| 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 ; 5, no. 1 ; Nr. 5, no. 1, S.75-81 |
| Datensatznummer |
250002256
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| Publikation (Nr.) |
 copernicus.org/hess-5-75-2001.pdf |
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| Zusammenfassung |
| An acid waters sensitivity map has been
widely used as a background resource for assessing potential impacts of forest
management on stream water acidity within Wales. The validity of this approach
has been explored by comparing predicted acid sensitivity with the observed acid
neutralisation capacity (ANC) in stream runoff using data sets from two regional
surveys of a major area of acidification concern in Wales. For catchments in
excess of 20 ha, the acid sensitivity predictions are generally upheld, although
biologically important extremes of acidity are not predicted. For smaller
catchments of 2 to 5 ha area, the large observed variations in ANC are poorly
predicted from the acid sensitivity map; there is no statistically significant
relationship between predicted sensitivity and measured baseflow and stormflow
ANC values for the catchments. This reflects the high degree of heterogeneity
within catchments and the complexity of soil and groundwater interactions. The
maps offer a starting point for assessing sensitivity. However, they provide no
more than a very crude indication at the scale of interest to forestry managers.
It is concluded that a more appropriate route for assessing sensitivity is via
field measurement and the direct use of water quality and biological
information.
Keywords: streams, forestry, acidification, acid sensitivity mapping, ANC, Wales |
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