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1 Zeszyty Naukowe. Inżynieria Środowiska / Uniwersytet Zielonogórski

1 2007

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Conversion of instable primary forests in the lusatian post-mining landscape

Ertle C., Bartelt D.

Zeszyty Naukowe. Inżynieria Środowiska / Uniwersytet Zielonogórski

2007

nr 133 (13)

84-94

In the federal state Brandenburg in Germany about 464 000 ha of mainlymiddle aged Scots pine stands are planned to be converted. In addition, instable broad leaved forests like disintegrating monocultural birch and poplar stands on dumps of lignite mining need conversion. Forest owners feel unsure regarding the silvicultural treatment in these stands. Therefore, research is needed to develop strategies for a forest conversion practice in primary forests on dumps within the mining landscape. The urgency of conversion of primary dump stands with regard to the tree species exists in the decreasing order: poplar, birch and Scots pine. While conversion of young primary pine forests into mixed broad-leaved forests is not advisable because of unfavourable site conditions, suitable timber stands on dumps represent favourable pioneer crops appropriate for conversion. Derived from investigations practical advises are given about kind, strength and time of preparatory thinning for under planting and ongoing thinning. The nutrition potential of the soil substrate has to be considered. Furthermore, height growth and leave mass of under planted oaks are indicators for the forest treatment.