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Table 1.2 Continued
dC / dt Organic matter decay rate (d − 1 )
D Soil gas diffusivity (cm 2 d − 1 )
θ Volumetric water content (cm 3 cm − 3 )
θs θ at saturation (cm 3 cm − 3 )
fd Constant denitrification fraction
t Time (d)
FC Subscript refers to field capacity
1.6. Overview of the dataset used in this work
The dataset made up of a total of 1129 records (Appendix A) of data that were obtained
from various sources. The data is divided into two sets, set “A” (n = 601) which is
composed of data gathered by Tucholke (2007) and set “B” (n = 597) obtained from
Oehler (2010). The data is combined into one dataset and the combined data is
represented here. The dataset composed by Tucholke (2007) was extracted from literature
reviews, and the majority of the data in set “B” is from Oehler (2010) is based on his
works.
Missing pH data from dataset A was filled in based on the mean value of the dataset, 20
pH values were filled in this represented 3.3% of dataset A. Since a direct correlation is
available between the bulk density and the organic carbon this approach was used for
estimating the organic carbon (OC) content of a soil based on the reported bulk density.
In total, 21 missing OC values were filled in (3.5% of all values).
Dataset B was essentially left unaltered, except for changes to the units (Appendix B) that
were needed to facilitate a combined dataset. The individual statics for the datasets are
given in Appendix C.
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