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| Titel |
Analyzing the management and disturbance in European forest based on self-thinning theory |
| VerfasserIn |
Y. Yan, B. Gielen, M. Schelhaas, F. Mohren, S. Luyssaert, I. A. Janssens |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250067750
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| Zusammenfassung |
| There is increasing awareness that natural and anthropogenic disturbance in forests affects
exchange of CO2, H2O and energy between the ecosystem and the atmosphere. Consequently
quantification of land use and disturbance intensity is one of the next steps needed to improve
our understanding of the carbon cycle, its interactions with the atmosphere and its main
drivers at local as well as at global level. The conventional NPP-based approaches to quantify
the intensity of land management are limited because they lack a sound ecological basis. Here
we apply a new way of characterising the degree of management and disturbance
in forests using the self- thinning theory and observations of diameter at breast
height and stand density. We used plot level information on dominant tree species,
diameter at breast height, stand density and soil type from the French national forest
inventory from 2005 to 2010. Stand density and diameter at breast height were used
to parameterize the intercept of the self-thinning relationship and combined with
theoretical slope to obtain an upper boundary for stand productivity given its density.
Subsequently, we tested the sensitivity of the self-thinning relationship for tree
species, soil type, climate and other environmental characteristics. We could find
statistical differences in the self-thinning relationship between species and soil types,
mainly due to the large uncertainty of the parameter estimates. Deviation from the
theoretical self-thinning line defined as DBH=αN-3-4, was used as a proxy for
disturbances, allowing to make spatially explicit maps of forest disturbance over
France. The same framework was used to quantify the density-DBH trajectory of
even-aged stand management of beech and oak over France. These trajectories will
be used as a driver of forest management in the land surface model ORCHIDEE. |
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