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| Titel |
The impact of broadleaved woodland on water resources in lowland UK: III. The results from Black Wood and Bridgets Farm compared with those from other woodland and grassland sites |
| VerfasserIn |
J. Roberts, P. Rosier |
| 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 ; 9, no. 6 ; Nr. 9, no. 6 (2005-12-31), S.614-620 |
| Datensatznummer |
250007142
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| Publikation (Nr.) |
 copernicus.org/hess-9-614-2005.pdf |
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| Zusammenfassung |
| In the United Kingdom the planting of broadleaved woodland has led to
concerns about the impact on water resources. Comparative studies, typically
using soil water measurements, have been established to compare water use of
broadleaved woodland and grassland. The diversity of outcomes from these
studies makes it difficult to make any consistent prediction of the
hydrological impact of afforestation. Most studies have shown greater drying
of soils under broadleaved woodland than under grass. However, two studies in
a beech wood growing on shallow soils above chalk at Black Wood, Micheldever,
Hampshire showed little overall difference between broadleaved woodland and
grass, either in soil water abstraction or in evaporation. Two factors are
thought to contribute to the different results from Black Wood. It is known
that evaporation can be considerably enhanced at the edges of woodlands or in
small areas of woodlands. The studies at Black Wood were made well within a
large area of fairly uniform woodland. Other studies in which a difference
occurred in soil drying between broadleaved woodland and grass used
measurements made in small areas of woodlands or at woodland edges. Another
important difference between comparison of woodland at Black Wood and
grassland growing nearby, also on shallow soils above Chalk, compared to
other broadleaved woodland/grass comparisons, growing on other geologies, is
the influence of the Chalk. Although vegetation such as grass (and woodland)
does not populate the chalk profusely with roots, water can be removed from
the Chalk by the roots which proliferate at the soil/chalk interface and
which can generate upward water movement within the Chalk. Published work
showed that only in a very dry summer did the evaporation from grass growing
on shallow soils above chalk fall below potential. In broadleaved
woodland/grass comparisons on non-chalky soils it is possible that moisture
deficits in the soil below the grass may reach critical levels and reduce
evaporation below that of the woodland with which it is being compared. |
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