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Gålnander, Helena (2005) Bevarande av naturvärdesträd i enlighet med FSC och Holmen Skogs naturvårdspolicy. Other thesis, SLU.

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In the end of 1998 the company Holmen Skog AB was certified accordint to the FSC system with an area of 1 036 000 hectare. After that Holmen Skog AB has been working actively with the nature conservation in the forestry. In order to control the quality of the company's nature conservation in final fellings they started a yearly inventory which is called BAKRUS (Judgement of ecological and culture care in relations to policies for a persevering silviculture). After 1999 the control was expended to include all actions in the forest. The collected data is the basis for the evaluation of how the regions and districts attain the company's strategic objective for nature conservations. The strategic objective is that at least 90 % of the final felled areas only haves one deviation per area. No deviation is tolerated concerning watercourse, relic of antiquity, areas with high environmental value and obvious green tree retention. In relation to the goal of not having any deviation concerning obvious nature trees, Holmen Skog AB wants in a more extensive way measure to what extend the nature trees are reserved in final felling. The purpose of this study is to evaluate how many nature trees there are and how many are reserved after final felling. The study was concentrated to the regions Lycksele and Örnsköldsvik that have 4 respective 5 districts. Ten percent of the planned area for final felling 2001 was inventoried, total 815 hectares. One inventory was made before final felling to point out the nature tree with an x – and y coordinate be means of the GPS system. A subjective classification of every tree was made according to the categories thin, normal and large. Next inventory was after final felling in order to check if the trees were preserved or cut down. On the 815 hectare that was inventoried 1.48 nature trees per hectares were preserved after final felling. In average there are 0.47 trees per hectare that are of the large category, 0.54 trees per hectare that are of the normal category and 0.47 of the small category. With A comparison between the two regions of Ö-vik and Lycksele shows that Ö-vik had the highest rate of remained trees per hectare, 1.61, compared to Lycksele that had 1.39. The tree species that separated the two regions the most is sallow; Ö-vik had 1.32 sallowtrees/hectare and Lycksele 1.39 sallowtrees/hectare. Except the 1205 remained trees 161 nature trees had been cut down, i.e. 11.8 % of the 1366 nature trees that were originally there. Divided between the two regions Ö-vik had cut down 11.2 % (64 trees) and Lycksele 12.3% (94 trees). The biggest reason that a nature tree is not kept after final felling is that it is cut down. 79 % of all the not spared nature trees have been cut down. Other reasons are that they have been knocked down by the machine or by another tree or that they have been made into a high stump. The objective that Holmen Skog AB has set is to have no deviation concerning the saving of obvious nature trees on final felling. The result of my study illustrates that this objective has not been achieved. There is a relatively large deviation concerning the saving of nature trees. About 25 % of the nature trees that I have come upon during the inventory before final felling and at least 11 % of all nature trees from both inventories have been cut down. The result gives an indication of how many nature trees that was cut down in the specific area. The result, the exact quantity of nature trees that was cut down, is how ever uncertain due to the number of the nature trees that have been overlooked in the two inventories. Also the vague definitions from FSC affect the result.

Item Type: Thesis (Other)
Keywords: naturvård, skogsbruk, FSC, Forest Stewerd Council, föryngringsavverkning
Subject (faculty): Faculty of Veterinary Medicine and Animal Science > Dept. of Forest Ecology and Management
Divisions: SLU > Faculty of Forest Sciences
Depositing User: editor epsilon
Date Deposited: 21 Apr 2006
Last Modified: 18 Aug 2015 09:39
URI: http://ex-epsilon.slu.se/id/eprint/949

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