Temperature dependence of organic matter decomposition: a critical review using literature data analyzed with different models |
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| Authors: | T Kätterer M Reichstein O Andrén A Lomander |
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| Institution: | (1) SLU, Department of Soil Sciences, Box 7014, S-75007 Uppsala, Sweden e-mail: thomas.katterer@mv.slu.se; Fax: +46-18-672795, SE;(2) Bayreuth Institute of Ecosystem Research, Department of Plant Ecology, D-95440 Bayreuth, Germany e-mail: markus.reichstein@bitoek.uni-bayreuth.de, DE;(3) SLU, Department of Forest Soils, Box 7001, S-75007 Uppsala, Sweden, SE |
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| Abstract: | The literature was reviewed regarding laboratory incubation studies where C mineralization was measured. Experiments were
selected in which the same substrate was incubated at least at two different temperatures and where time-series were available
with at least four measurements for each substrate and temperature. A first-order one-component model and a parallel first-order
two-component model were fitted to the CO2–C evolution data in each experiment using a least-squares procedure. After normalising for a reference temperature, the temperature
coefficient (Q
10
) function and three other temperature response functions were fitted to the estimated rate constants. The two-component model
could describe the dynamics of the 25 experiments much more adequately than the one-component model (higher R2, adjusted for the number of parameters), even when the rate constants for both were assumed to be equally affected by temperature.
The goodness-of-fit did not differ between the temperature response models, but was affected by the choice of the reference
temperature. For the whole data set, a Q
10
of 2 was found to be adequate for describing the temperature dependence of decomposition in the intermediate temperature
range (about 5–35 °C). However, for individual experiments, Q
10
values deviated greatly from 2. At least at temperatures below 5 °C, functions not based on Q
10
are probably more adequate. However, due to the paucity of data from low-temperature incubations, this conclusion is only
tentative, and more experimental work is called for.
Received: 1 December 1997 |
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| Keywords: | Carbon evolution Decomposition Modelling Temperature coefficient (Q10) Temperature effects |
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