1. General Model Information

Name: DocMod

Acronym: DOCMOD

Main medium: terrestrial
Main subject: biogeochemistry
Organization level: landscape
Type of model: not specified
Main application:
Keywords: decomposition, leaching, dissolved organic carbon, dissolved organic nitrogen, forest floor, soil organic matter, nutrient dynamics,immobilization, landscape, recovery, retention


WilliamS. Currie
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Recent field studies have made it possible to incorporate more broadly-derived relationshipes into decomposition models and to test them more broadly as well . At the landscape scale, the forest floor exhibits high levels of heterogeneity in structure and function. In this study we used field observations of changes in proximate C fractions and N content in litter over time, together with field observations of leaching fluxes of dissolved organic C and N, to construct DocMod, a model of C fraction and N dynamics during litter decomposition and humification. Leaching of dissolved organic matter from the forest floor is included explicitly. We linked this to the terrestrial ecosystem model PnET, coupled the two process models together in a GIS and modeled landscape-scale patterns in forest-floor mass and N dynamics in the White Mountain National Forest in New Hampshire, USA. This area has strong elevational gradients in climate and forest type. Our blind predictions of decomposition rates in four widely different ecosystems validated well against field measurements. The model also reproduced patterns in published chronosequence measurements of forest floor mass following clear-cutting in the White Mountains.

II. Technical Information

II.1 Executables:

Operating System(s):

II.2 Source-code:

Programming Language(s):

II.3 Manuals:

II.4 Data:

III. Mathematical Information

III.1 Mathematics

III.2 Quantities

III.2.1 Input

III.2.2 Output

IV. References

Currie, William S. 1995. Forest floor leachate biogeochemistryand decomposition dynamics. Ph.D. dissertation, Institute for the Studyof Earth, Oceans and Space, University of New Hampshire.

V. Further information in the World-Wide-Web

VI. Additional remarks

GIS images of litter production, forest-floor mass, and leaching of dissolvedorganic C and N across the White Mountain National Forest are available.Images are in Idrisi format at 10 ha resolution.

Last review of this document by: T. Gabele: Tue Oct 7 1997
Status of the document:
last modified by Tobias Gabele Wed Aug 21 21:44:41 CEST 2002

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