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Single-pool exponential decomposition models: potential pitfalls in their use in ecological studies

Adair, E. Carol ; Hobbie, Russell K ; Hobbie, Sarah E

Ecology (Durham), 2010-04, Vol.91 (4), p.1225-1236 [Periódico revisado por pares]

Washington, DC: Ecological Society of America

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Título:
Single-pool exponential decomposition models: potential pitfalls in their use in ecological studies
Autor: Adair, E. Carol ; Hobbie, Russell K ; Hobbie, Sarah E
Assuntos: Animal and plant ecology ; Animal, plant and microbial ecology ; Average linear density ; Biodegradation, Environmental ; Biological and medical sciences ; Biomass ; data transformation ; Decomposition ; decomposition rate ; Ecological modeling ; Ecology ; Ecosystem ; Ecosystems ; Error rates ; Estimate reliability ; Estimation bias ; Estimation methods ; Fundamental and applied biological sciences. Psychology ; General aspects ; Linear regression ; litterbag ; model fitting ; Modeling ; Models, Biological ; Preliminary estimates ; regression ; Regression analysis ; Simulation ; Studies ; Time Factors ; Zero
É parte de: Ecology (Durham), 2010-04, Vol.91 (4), p.1225-1236
Notas: Corresponding Editor: P. M. Groffman.
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Descrição: The importance of litter decomposition to carbon and nutrient cycling has motivated substantial research. Commonly, researchers fit a single-pool negative exponential model to data to estimate a decomposition rate ( k ). We review recent decomposition research, use data simulations, and analyze real data to show that this practice has several potential pitfalls. Specifically, two common decisions regarding model form (how to model initial mass) and data transformation (log-transformed vs. untransformed data) can lead to erroneous estimates of k . Allowing initial mass to differ from its true, measured value resulted in substantial over- or underestimation of k . Log-transforming data to estimate k using linear regression led to inaccurate estimates unless errors were lognormally distributed, while nonlinear regression of untransformed data accurately estimated k regardless of error structure. Therefore, we recommend fixing initial mass at the measured value and estimating k with nonlinear regression (untransformed data) unless errors are demonstrably lognormal. If data are log-transformed for linear regression, zero values should be treated as missing data; replacing zero values with an arbitrarily small value yielded poor k estimates. These recommendations will lead to more accurate k estimates and allow cross-study comparison of k values, increasing understanding of this important ecosystem process.
Editor: Washington, DC: Ecological Society of America
Idioma: Inglês

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Single-pool exponential decomposition models: potential pitfalls in their use in ecological studies

Adair, E. Carol ; Hobbie, Russell K ; Hobbie, Sarah E

Washington, DC: Ecological Society of America

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