 |
| Titel |
Changes in rainfall interception along a secondary forest succession gradient in lowland Panama |
| VerfasserIn |
B. Zimmermann, A. Zimmermann, H. L. Scheckenbach, T. Schmid, J. S. Hall, M. van Breugel |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1027-5606
|
| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 17, no. 11 ; Nr. 17, no. 11 (2013-11-26), S.4659-4670 |
| Datensatznummer |
250086004
|
| Publikation (Nr.) |
 copernicus.org/hess-17-4659-2013.pdf |
|
|
|
|
|
| Zusammenfassung |
| Secondary forests are rapidly expanding in tropical regions. Yet, despite
the importance of understanding the hydrological consequences of land-cover
dynamics, the relationship between forest succession and canopy interception
is poorly understood. This lack of knowledge is unfortunate because rainfall
interception plays an important role in regional water cycles and needs to
be quantified for many modeling purposes. To help close this knowledge gap,
we designed a throughfall monitoring study along a secondary succession
gradient in a tropical forest region of Panama. The investigated gradient
comprised 20 forest patches 3 to 130 yr old. We sampled each patch with a
minimum of 20 funnel-type throughfall collectors over a continuous 2-month
period that had nearly 900 mm of rain. During the same period, we acquired
forest inventory data and derived several forest structural attributes. We
then applied simple and multiple regression models (Bayesian model
averaging, BMA) and identified those vegetation parameters that had the
strongest influence on the variation of canopy interception. Our analyses
yielded three main findings. First, canopy interception changed rapidly
during forest succession. After only a decade, throughfall volumes
approached levels that are typical for mature forests. Second, a
parsimonious (simple linear regression) model based on the ratio of the
basal area of small stems to the total basal area outperformed more complex
multivariate models (BMA approach). Third, based on complementary forest
inventory data, we show that the influence of young secondary forests on
interception in real-world fragmented landscapes might be detectable only in
regions with a substantial fraction of young forests. Our results suggest
that where entire catchments undergo forest regrowth, initial stages of
succession may be associated with a substantial decrease of streamflow
generation. Our results further highlight the need to study hydrological
processes in all forest succession stages, including early ones. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|