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| Titel |
Decadal water balance of a temperate Scots pine forest (Pinus sylvestris L.) based on measurements and modelling |
| VerfasserIn |
B. Gielen, H. Verbeeck, J. Neirynck, D. A. Sampson, F. Vermeiren, I. A. Janssens |
| 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 ; 7, no. 4 ; Nr. 7, no. 4 (2010-04-13), S.1247-1261 |
| Datensatznummer |
250004664
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| Publikation (Nr.) |
 copernicus.org/bg-7-1247-2010.pdf |
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| Zusammenfassung |
| We examined the water balance components of an 80-year-old Scots pine
(Pinus sylvestris L.) forest stand in the Campine region of Belgium over a ten year period
using five very different approaches; our methods ranged from data intensive
measurements to process model simulations. Specifically, we used the
conservative ion method (CI), the Eddy Covariance technique (EC), an
empirical model (WATBAL), and two process models that vary greatly in their
temporal and spatial scaling, the ORCHIDEE global land-surface model and
SECRETS a stand- to ecosystem-scale biogeochemical process model. Herein we
used the EC technique as a standard for the evapotranspiration (ET)
estimates. Using and evaluating process based models with data is extremely
useful as models are the primary method for integration of small-scale,
process level phenomena into comprehensive description of forest stand or
ecosystem function. Results demonstrated that the two process models
corresponded well to the seasonal patterns and yearly totals of ET from the
EC approach. However, both WATBAL and CI approaches overestimated ET when
compared to the EC estimates. We found significant relationships between
several meteorological variables (i.e., vapour pressure deficit [VPD], mean
air temperature [Tair], and global radiation [Rg]) and ET on monthly basis
for all approaches. In contrast, few relationships were significant on
annual basis. Independent of the method examined, ET exhibited low
inter-annual variability. Consequently, drainage fluxes were highly
correlated with annual precipitation for all approaches examined, except CI. |
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