Is it possible to introduce earthworm populations as part of a forest soil restoration strategy?

The decline of tree vitality in industrialised countries observed since the 1970s is often attributed to the degradation of forest soils. Such degradation processes can be hard to reverse because of the irreversible and sometimes mutually strengthening character of certain soil chemical, biological and physical processes. Tree species change can be seen as a way that interrupts the degradation spiral, because it might strongly influence soil characteristics. However, a sustained impact of tree species change, coupled to longterm amelioration of humus quality and physico-chemical soil conditions, can only take place if the soil fauna associated with mull humus is also rehabilitated. Here it would be interesting to know, if it is possible to introduce earthworm populations as part of a forest soil restoration strategy?

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