Abstract #301342

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JSM 2003 Abstract #301342
Activity Number: 98
Type: Contributed
Date/Time: Monday, August 4, 2003 : 9:00 AM to 10:50 AM
Sponsor: Section on Statistics & the Environment
Abstract - #301342
Title: Cultivation Effects on Humus Forms in the Alpine Region: An Application of Mixed-Effects Models.
Author(s): Gilg U. H. Seeber*+ and Julia Seeber
Companies: Universitat Innsbruck and University of Innsbruck
Address: Universitätsstr. 15, Innsbruck, A-6020, Austria
Keywords: statistical modeling ; mixed-effects models ; soil properties ; alpine region
Abstract:

Humus forms are liable to a number of different influences such as vegetation, type of management, exposition and microclimate. Due to the large number of factors that affect the development of humus forms and the decomposition of organic material humus layers can be used as sensitive site factors, which, in contrast to the mineral soil, respond to alterations rather quickly. Because of the abandonment of alpine meadows and pastures and the thus following structural changes in their management the ecological equilibrium, which has developed as a result of centuries of cultivation, is disturbed. Due to the rough conditions in the mountain area alpine ecosystems respond to environmental changes even more sensitive. The work in hand aims at elucidating the effect of land-use changes on humus forms and soil properties to provide an insight into the dynamics of decomposition in alpine ecosystems. This poster reports the use of linear and nonlinear mixed-effects models to analyze data collected in a designed experiment, taking into account both design effects as well as the complex structure of variates effecting the variables of interest.

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