Details

Autor(en) / Beteiligte

• Richardson, Andrew D.
• Braswell, Bobby H.
• Hollinger, David Y.
• Burman, Prabir
• Davidson, Eric A.
• Evans, Robert S.
• Flanagan, Lawrence B.
• Munger, J. William
• Savage, Kathleen
• Urbanski, Shawn P.
• Wofsy, Steven C.

Titel

Comparing simple respiration models for eddy flux and dynamic chamber data

Ist Teil von

• Agricultural and forest meteorology, 2006-12, Vol.141 (2), p.219-234

Ort / Verlag

Amsterdam: Elsevier B.V

Erscheinungsjahr

2006

Quelle

Access via ScienceDirect (Elsevier)

Beschreibungen/Notizen

• Selection of an appropriate model for respiration ( R) is important for accurate gap-filling of CO 2 flux data, and for partitioning measurements of net ecosystem exchange (NEE) to respiration and gross ecosystem exchange (GEE). Using cross-validation methods and a version of Akaike's Information Criterion (AIC), we evaluate a wide range of simple respiration models with the objective of quantifying the implications of selecting a particular model. We fit the models to eddy covariance measurements of whole-ecosystem respiration ( R eco) from three different ecosystem types (a coniferous forest, a deciduous forest, and a grassland), as well as soil respiration data from one of these sites. The well-known Q 10 model, whether driven by air or soil temperature, performed poorly compared to other models, as did the Lloyd and Taylor model when used with two of the parameters constrained to previously published values and only the scale parameter being fit. The continued use of these models is discouraged. However, a variant of the Q 10 model, in which the temperature sensitivity of respiration varied seasonally, performed reasonably well, as did the unconstrained three-parameter Lloyd and Taylor model. Highly parameterized neural network models, using additional covariates, generally provided the best fits to the data, but appeared not to perform well when making predictions outside the domain used for parameterization, and should thus be avoided when large gaps must be filled. For each data set, the annual sum of modeled respiration (annual Σ R) was positively correlated with model goodness-of-fit, implying that poor model selection may inject a systematic bias into gap-filled estimates of annual Σ R.