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Manipulating species numbers
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Each species-diversity level will be replicated with different mixtures thus avoiding confusion between idiosyncratic effects of species identity and effects of species number per se. However, we cannot replicate identical mixtures at most diversity levels due to space limitations. Only the highest diversity level will be replicated in several identical species combinations so that we will have at least an estimate of variability within mixtures. All possible combinations out of a species pool of 6 (calcareous site "Mehrstedt") and 4 (acidic site "Kaltenborn") will be planted. Some species combinations won’t be of particular relevance for forestry as they are not considered in current planting plans. However, we also want to ensure the possibility of "surprises" in terms of unexpected performance of certain mixtures that normally won’t be part of silviculture in Germany.
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| Species number |
| Replicates |
6 |
15 |
15 |
1(3) |
39 |
| Species number |
| Replicates |
4 |
6 |
4 |
1(2) |
16 |
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