Diversity index
Definition
The diversity index is calculated using the Shannon-Wiener index. The Shannon-Wiener index is a measure of ecological diversity. The index uses the number of species and their abundance as input.
How the Shannon-Wiener index works
- The lowest value of the index is 0 (meaning only one species is present).
- The maximum value depends on the number of species when they are all present in the same quantity.
The Shannon-Wiener index therefore reflects both species richness and evenness, how equally individuals are distributed among species.
Application in Soil Life Monitor
In Soil Life Monitor, the Shannon-Wiener index is based on the six groups measured:
- Gram+ bacteria
- Gram- bacteria
- Actinomycetes
- Arbuscular mycorrhiza
- Other fungi
- Protozoa
Interpretation and importance
Higher diversity is often related to better stability and resilience. Disturbances, lack of diverse input from food sources, and poor crop rotation can decrease the diversity.
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