Modelling the coverage and annual variation in bilberry yield in Finland

Turtiainen, Marjut; Miina, Jari; Salo, Kauko; Hotanen, Juha‐Pekka

doi:10.14214/sf.1573

Cited by 17 publications

(8 citation statements)

References 19 publications

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“…The fresh weight of bilberry shoots was predicted as a function of site and stand characteristics by using a bilberry coverage model. The following model (without stand age as a predictor) was fitted based on the same data that were used by Turtiainen et al [20]:…”

Section: Bilberry Shootsmentioning

confidence: 99%

Synergies and Trade-Offs in the Production of NWFPs Predicted in Boreal Forests

Kurttila

Pukkala

Miina

2018

Forests

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The global growth of the consumption of non-wood forest products (NWFPs) is evident due to the current trends in lifestyle and consumption. Alongside the increased popularity and commercial use of NWFPs, their yields are also more often taken into account in forest management planning. Empirical yield models recently developed for different NWFPs enable forest managers to include their predicted yields in multi-objective optimization. However, knowledge on the synergies and trade-offs between timber production and different NWFPs is scanty. In this study, we analyzed these relationships through correlation matrices and production possibility frontiers in two case study forest holdings from Finland. A large number of Pareto optimal forest holding level plans were produced by multi-objective optimization and used to analyze trade-offs and synergies. Empirical yield models for 12 NWFPs, representing different berries, mushrooms, and tree-based products, were utilized in the analyses. The results revealed synergies and possibilities for joint-production for NWFPs, but also trade-offs between NWFPs and timber production. NWFPs often had a negative correlation with cutting removals, with the only exception being cowberry. Despite the overall negative correlation, the maximum yields of NWFPs called for some cuttings. Negative correlations with the net present value of timber production were weaker. The results are valuable when the aim is to diversify the use of boreal forests and open avenues for truly multi-objective decision support services to facilitate the decision making of forest owners.

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Section: Bilberry Shootsmentioning

confidence: 99%

Synergies and Trade-Offs in the Production of NWFPs Predicted in Boreal Forests

Kurttila

Pukkala

Miina

2018

Forests

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“…, Turtiainen et al. , Nilsson and Cory ). This finding might suggest one reason, in addition to the possible higher predation risk and low understorey cover that plantations, in contrast to old forests, seem to be unsuitable habitats for grouse broods (Kastdalen and Wegge , Moss and Oswald , Miettinen et al.…”

Section: Discussionmentioning

confidence: 97%

The effect of human‐modified landscape structure on forest grouse broods in two landscape types

et al. 2017

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Citation: Huhta, E., P. Helle, V. Nivala, and A. Nikula. 2017. The effect of human-modified landscape structure on forest grouse broods in two landscape types. Ecosphere 8(9):e01950. 10. 1002/ecs2.1950 Abstract. The population sizes and the breeding success of Finnish tetraonids have been decreasing for decades. In this study, the presence of a grouse hen with a brood in a landscape was used to indicate habitat-related breeding success. We combined the locations of 938 black grouse (Tetrao tetrix), 388 capercaillie (T. urogallus), and 917 hazel grouse (Tetrastes bonasia) broods after the breeding season in midAugust with landscape data by employing Geographic Information System and grouse data derived from the Finnish wildlife triangle censuses conducted during [1997][1998][1999][2000][2001][2002][2003][2004]. Two large study areas with different landscape structures, northern forest-mire area and southern cultivated area, were selected for the investigation. The presence of grouse broods was positively related to the amount of old coniferous mixed forest. Grouse broods may prefer this forest habitat because of a rich understorey cover and a rich bilberry field layer offering a diversity of insects as food. Broods had a strong positive response to the amount of forest habitat. The effect of forest fragmentation on the broods' distribution did not increase even with decreasing forest habitat. We suggest that there are several ecological causes for the observed spatial correlations. Predation on nests and broods by generalist predators is presumably high in human-modified open and semi-open landscapes. Against our expectations, the effect of landscape composition on grouse broods was more marked in the northern than in the southern study area, most likely because predator populations are more food-regulated in the north. This finding supports the alternative prey hypothesis. Further, large drained and reforested peatland mire areas had a negative impact on grouse broods in the north. In the drainage areas, decreased availability of vegetation cover and insect food, increased predation risk, and drowning of chicks in ditches may increase brood mortality.

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“…These characteristics also appear in younger forests and may have confused the modelling because the forest classes known to have negative effects on grouse occurrences, such as clear-cut areas and seedlings, were not included as explanatory variables in the model. It has been found that on mineral soils the cover provided by blueberry bushes increases with forest stand age and basal area and decreases strongly during regeneration cuttings (Tonteri et al 2016;Turtiainen et al 2016;Nilsson and Cory 2017). Because recently regenerated stands have lower understory cover and higher predation risks, grouse brood survival is better in old forest stands (Kastdalen and Wegge 1985;Moss and Oswald 1985;Miettinen et al 2010;Melin et al 2016).…”

Section: Discussionmentioning

confidence: 99%

Trade-offs between wood production and forest grouse habitats in two regions with distinctive landscapes

et al. 2020

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Background: Forest management affects the viability of forest grouse populations, causing alterations to habitat quality. At the regional level, common targets for wood harvesting and safeguarding of specific habitats are negotiated between various stakeholders. Analysing potential trade-offs between forest grouse habitats and wood production in the region could support resource-smart decision making. Methods: In this paper, we compiled trade-off curves represented as production possibility frontiers demonstrating the relationship between forest grouse habitat area and wood removal, using a Finnish forestry dynamics model and the Finnish Multi-Source National Forest Inventory. For the modelling of forest grouse habitats, a landscape-level occurrence model based on nationwide wildlife triangle census data was used. Five alternative forest scenarios in terms of wood removal were compiled for two study areas in Finland representing two different landscape structures. Results and conclusions: Results showed that impacts on forest grouse habitats were case-specific. In the southern study area, increasing the roundwood harvesting rate affected grouse habitats more strongly as forests were already fragmented for other land uses and became more spruce-dominated over time. If the maximum sustainable removal rate was implemented, predicted grouse habitat area was 55% less than in a no-removal scenario. In the eastern study area, a more heavily forested region, the decrease was far lower at 22%. Scenario results were also compared to levels of recorded (business as usual) wood removal and that envisaged by valid regional forestry programmes, and their sustainability in terms of grouse habitat area was discussed. The production possibility frontiers calculated in this study support the evaluation of the loss of suitable habitat caused by different wood harvesting rates, or vice versa, the economic cost of increasing habitat areas.

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Modelling the coverage and annual variation in bilberry yield in Finland

Cited by 17 publications

References 19 publications

Synergies and Trade-Offs in the Production of NWFPs Predicted in Boreal Forests

Synergies and Trade-Offs in the Production of NWFPs Predicted in Boreal Forests

The effect of human‐modified landscape structure on forest grouse broods in two landscape types

Trade-offs between wood production and forest grouse habitats in two regions with distinctive landscapes

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