The Introduction of Lodgepole Pine (Pinus Contorta) in Sweden“

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The Introduction of Lodgepole Pine (Pinus Contorta) in Sweden“

The introduction of lodgepole pine (Pinus contorta var. latifolia) in Sweden Erik Valinger Professor Two pioneers in the 1970s Iggesunds bruk (Roland Nellbäck) SCA (Stig Hagner) Photo: Bror Österman Photo: SCA PF Reasons for the introduction • Filling up expected gap in timber supply • Other positive characteristics: – Good ability to survive damage – Frost tolerant and high seedling survival – Resistant to several fungi, e.g. pine rust (Melampsora populnea) , pine blister rust (Cronartium flaccidum) , pine needle-cast fugus (Lophodermium seditiosum) – Less attractive to Moose (Alces alces) – Wood characteristics as Scots pine Distribution in Sweden Figure: Lodgepole pine, proportion of total productive woodland in Sweden 2005-2009. (Swedish National Forest Inventory, 2009). 60° SLU’s oldest provenace trial with lodgepole pine ”The Bang-series” Established 1960-62 11 sites from Skåne to Norrbotten 10 to 23 provenances Production results • Approx. 600 000 ha of lodgepole pine in Sweden • Approx. 2 % of productive foreset area and 1 % of total standing volume • 30-40% increase in growth 3 • Actual effect of total growth ~1 mill. m Standing volume 35 30 3 25 20 15 10 Standingvolume,mill. m 5 0 0-9 10-14 15-19 20-24 25-29 30-34 35-44 45- Total Diameter classes, cm Figure 1. Standing volume of lodgepole pine per diameter class (mill. m3) Korsseleberget • One of the oldest stands in Sweden (87 yrs) • Total production 612 m3, i.e. 7 m3/ha, yr Drawbacks and hazards • Infection byGremeniella abietina • Rodents • Wind and snow damage • Instability • Crooked stems • Vegetation of reindeer leichens suffers Crooked stems Possible drawbacks • Invasive growth, regenerates naturally and outcompete native species • Fungii and insects • Thinning regimes • Different species composition • Less species in comparison to Scots pine stands Invasive growth Fungii and insects Rust fungii Mountain pine beetle Canfor Salmon river and Winton bear lake, Prince George The future • Evaluate effects of pathogenes, self spreading capacity, biological diversity, thinning regimes, and species composition • Increased area for regeneration with lodgepole pine is not desired from ecological perspectives until further studies have been carried out Thank you! .

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