INFLUENCES OF SPECIES MIXTURE ON BIOMASS OF NORWAY SPRUCE (Picea abies (L.) Karst.) FORESTS IN THE DUSSELDORF DISTRICT IN GERMANY

Year 2012, Volume: 14 Issue: 21, 47 - 55, 01.03.2012

Nedim Saraçoğlu Halil Barış Özel Murat Ertekin

Abstract

Norway spruce (Picea abies (L.) Karst.) is an important tree species for forest plantation in Germany. The

planting tree has a very large area especially in Düsseldorf province. And pattern of growing is mixture of with

Norway spruce and other tree species. The effect of tree diversity on productivity is poorly understood in

subtropical forests in Germany. We investigated the biomass of tree, understory vegetation, coarse roots and fine

roots with varying proportions of Norway spruce mixed other tree species at the stands in the same age. With an

increase proportion of Norway spruce, biomass of tree and understory biomass increased at first, and then

gradually decreased. As expected, biomass of fine roots decreased with soil depth. Stands with 40-60% of

Norway spruce had the highest biomass, while stands with <20% of Norway spruce had the least biomass.

Stands with <20% Norway spruce had the least understory biomass, while those with 20-40% Masson pine had

the least fine root biomass.

Keywords

Norway spruce

INFLUENCES OF SPECIES MIXTURE ON BIOMASS OF NORWAY SPRUCE (Picea abies (L.) Karst.) FORESTS IN THE DUSSELDORF DISTRICT IN GERMANY

Abstract

Norway spruce (Picea abies (L.) Karst.) is an important tree species for forest plantation in Germany. The
planting tree has a very large area especially in Düsseldorf province. And pattern of growing is mixture of with
Norway spruce and other tree species. The effect of tree diversity on productivity is poorly understood in
subtropical forests in Germany. We investigated the biomass of tree, understory vegetation, coarse roots and fine
roots with varying proportions of Norway spruce mixed other tree species at the stands in the same age. With an
increase proportion of Norway spruce, biomass of tree and understory biomass increased at first, and then
gradually decreased. As expected, biomass of fine roots decreased with soil depth. Stands with 40-60% of
Norway spruce had the highest biomass, while stands with <20% of Norway spruce had the least biomass.
Stands with <20% Norway spruce had the least understory biomass, while those with 20-40% Masson pine had
the least fine root biomass. 

Keywords

Norway spruce, mixed forest, biomass, arboreal stratum, undergrowth

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