Kids Do Ecology
|How to Calculate the Climate Decomposition
A CDI is a multiplicative function that describes the effect of monthly
variation in temperature and water on decomposition. The water function
assumes that water controls decomposition primarily
through water stress. Thus, extremely high levels of soil
(e.g., waterlogged soils) may not be well represented by these
Annual CDIs are the mean value of monthly CDIi's, which are
calculated as a function of mean monthly air temperature (Ti),
and monthly PETi
of the ith month:
In Adair et al. (2008), multiple
temperature equations were compared using the Long-term
Experiment Team (LIDET)
data set. For this data set, the best equation was the Lloyd and Taylor
(1994) variable Q10 temperature function (shown above as FT(Ti)).
CDI may be calculated using monthly precipitation and temperature data.
If climate data are not available, it is possible to use simulated
data from CRU.
Two options are available for calculating CDI (excel files):
using the Lloyd and Taylor (1994) temperature function
using an arctangent temperature function (Del Grosso et al. 2005)
Please feel free to contact me (adair(at)nceas(dot)ucsb(dot)edu)
photo: Mt. Massive in Colorado, 2009