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Ahonen-Jonnarth, Ulla
Publications (10 of 10) Show all publications
Milutinovic, G., Ahonen-Jonnarth, U. & Seipel, S. (2018). GISwaps: A New Method for Decision Making in Continuous Choice Models Based on Even Swaps. International Journal of Decision Support System Technology, 10(3), 57-78
Open this publication in new window or tab >>GISwaps: A New Method for Decision Making in Continuous Choice Models Based on Even Swaps
2018 (English)In: International Journal of Decision Support System Technology, ISSN 1941-6296, E-ISSN 1941-630X, Vol. 10, no 3, p. 57-78Article in journal (Refereed) Published
Abstract [en]

This article describes how continuous GIS-MCDM problems are commonly managed by combining some weighting method based on pairwise comparisons of criteria with an aggregation method. The reliability of this approach may be questioned, though. First, assigning weights to criteria, without taking into consideration the actual consequences or values of the alternatives, is in itself controversial. Second, the value functions obtained by this approach are in most cases linear, which is seldom the case in reality. The authors present a new method for GIS-MCDM in continuous choice models based on Even Swaps. The method is intuitive and easy to use, based on value trade-offs, and thus not relying on criteria weighting. Value functions obtained when using the method may be linear or non-linear, and thereby are more sensitive to the characteristics of the decision space. The performed case study showed promising results regarding the reliability of the method in GIS-MCDM context.

Place, publisher, year, edition, pages
IGI Global, 2018
Keywords
Continuous Choice Models, Even Swaps, GIS-MCDM, Trade-Offs, Value Functions
National Category
Engineering and Technology
Identifiers
urn:nbn:se:hig:diva-26576 (URN)10.4018/IJDSST.2018070104 (DOI)000455413900004 ()2-s2.0-85047766922 (Scopus ID)
Available from: 2018-05-16 Created: 2018-05-16 Last updated: 2019-03-19Bibliographically approved
Ahonen-Jonnarth, U. & Odelstad, J. (2010). Simulation as a tool for the evaluation of forest management treatments. In: Gerrit K. Janssens, Katrien Ramaekers and An Caris (Ed.), ESM'2010 - The 2010 European Simulation and Modelling Conference: . Paper presented at 24th Annual European Simulation and Modelling Conference, ESM 2010, 25-27 October 2010, Hasselt, Belgium (pp. 426-433). Ghent: EUROSIS-ETI
Open this publication in new window or tab >>Simulation as a tool for the evaluation of forest management treatments
2010 (English)In: ESM'2010 - The 2010 European Simulation and Modelling Conference / [ed] Gerrit K. Janssens, Katrien Ramaekers and An Caris, Ghent: EUROSIS-ETI , 2010, p. 426-433Conference paper, Published paper (Refereed)
Abstract [en]

Cleaning of young forest stands is a multicriteria problem with conflicting goals. This kind of forest management treatment is performed by human beings but it is possible that this work may be performed by artificial agents in the future. The artificial agents need detailed information about how to clean a forest stand and/or what are the goals for cleaning. One problem in development of cleaning rules for artificial cleaning agents is that explicit knowledge about good cleaning results is not detailed. In this paper we present a tool for developing and testing rules and judging evaluation functions for cleaning. We illustrate this tool by presenting examples of some ways to clean forest stands in a computer environment and we present how the cleaning results can be evaluated. In order to obtain material for experiments it is also possible to simulate forest stands using this tool.

Place, publisher, year, edition, pages
Ghent: EUROSIS-ETI, 2010
Keywords
on-line algorithm, forest cleaning
National Category
Computer Sciences
Identifiers
urn:nbn:se:hig:diva-7884 (URN)000305812900067 ()2-s2.0-84898654339 (Scopus ID)978-90-77381-57-1 (ISBN)
Conference
24th Annual European Simulation and Modelling Conference, ESM 2010, 25-27 October 2010, Hasselt, Belgium
Projects
Besluts-, risk- och policyanalys
Available from: 2010-11-05 Created: 2010-11-01 Last updated: 2018-03-13Bibliographically approved
Ahonen-Jonnarth, U. & Odelstad, J. (2006). Evaluation of simulations with conflicting goals with application to cleaning of young forest stands. In: Proceedings of ISC 2006 (Forth International Industrial Simulation Conference). Paper presented at 4th Industrial Simulation Conference (ISC-2006) Palermo, Italy, June 5-7, 2006 (pp. 498-503).
Open this publication in new window or tab >>Evaluation of simulations with conflicting goals with application to cleaning of young forest stands
2006 (English)In: Proceedings of ISC 2006 (Forth International Industrial Simulation Conference), 2006, p. 498-503Conference paper, Published paper (Other academic)
Identifiers
urn:nbn:se:hig:diva-1058 (URN)90-77381-26-0 (ISBN)
Conference
4th Industrial Simulation Conference (ISC-2006) Palermo, Italy, June 5-7, 2006
Available from: 2007-12-19 Created: 2007-12-19 Last updated: 2018-03-13Bibliographically approved
Ahonen-Jonnarth, U. & Odelstad, J. (2005). Simulation of cleaning of young forest stands.
Open this publication in new window or tab >>Simulation of cleaning of young forest stands
2005 (English)Report (Other academic)
Publisher
p. 25
Series
Reports from Creativ Media Lab, University of Gävle ; 2005:2
Identifiers
urn:nbn:se:hig:diva-1059 (URN)
Available from: 2007-12-13 Created: 2007-12-13 Last updated: 2018-03-13Bibliographically approved
Larsson, P., Lehnbom, J., Ahonen-Jonnarth, U. & Odelstad, J. (2004). Beståndssimulering. Delrapport inom projektet Skogssimulering: Beskrivning av programmet Beståndssimulator 1.0.
Open this publication in new window or tab >>Beståndssimulering. Delrapport inom projektet Skogssimulering: Beskrivning av programmet Beståndssimulator 1.0
2004 (Swedish)Report (Other academic)
Identifiers
urn:nbn:se:hig:diva-1046 (URN)
Available from: 2007-12-12 Created: 2007-12-12 Last updated: 2018-03-13Bibliographically approved
Tarvainen, O., Markkola, A. M., Ahonen-Jonnarth, U., Jumpponen, A. & Strömmer, R. (2004). Changes in Ectomycorrhizal Colonization and Root Peroxidase Activity in Pinus sylvestris Nursery Seedlings Planted in Forest Humus. Scandinavian Journal of Forest Research, 19(5), 400-408
Open this publication in new window or tab >>Changes in Ectomycorrhizal Colonization and Root Peroxidase Activity in Pinus sylvestris Nursery Seedlings Planted in Forest Humus
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2004 (English)In: Scandinavian Journal of Forest Research, ISSN 0282-7581, E-ISSN 1651-1891, Vol. 19, no 5, p. 400-408Article in journal (Refereed) Published
Abstract [en]

Plant biomass, root colonization by ectomycorrhizal (ECM) fungi and root peroxidase (POD) activity were monitored in Scots pine (Pinus sylvestris L.) nursery seedlings during the first growing season after planting (after 4, 8 and 16 weeks, in July, August and October, respectively) in forest humus in outdoor open-top chambers with gaseous atmospheric pollutants (combinations of low levels of ozone, sulfur dioxide and nitrogen oxides). The number of ECM morphotypes as well as root biomass increased towards the end of the growing season, while root POD activity decreased. Fungal biomass estimated as ergosterol concentration peaked in August, 8 weeks after planting. The seedling growth, mycorrhizal status and POD activity in the roots were not affected by the gaseous pollutants.

Identifiers
urn:nbn:se:hig:diva-1048 (URN)10.1080/02827580410030181 (DOI)000224024300002 ()
Available from: 2007-12-13 Created: 2007-12-13 Last updated: 2018-03-13Bibliographically approved
Ahonen-Jonnarth, U., Roitto, M., Markkola, A. M., Ranta, H. & Neuvonen, S. (2004). Effects of Nickel and Copper on Growth and Mycorrhiza of Scots Pine Seedlings Inoculated with Gremmeniella abietina. Forest Pathology, 34(6), 337-348
Open this publication in new window or tab >>Effects of Nickel and Copper on Growth and Mycorrhiza of Scots Pine Seedlings Inoculated with Gremmeniella abietina
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2004 (English)In: Forest Pathology, ISSN 1437-4781, E-ISSN 1439-0329, Vol. 34, no 6, p. 337-348Article in journal (Other academic) Published
Abstract [en]

Scots pine (Pinus sylvestris) seedlings were planted in soil originating from two localities with different background levels of nickel and copper. In addition, some of the seedlings were exposed to additional nickel (20.5 mg Ni/l of soil) or copper (63.5 mg Cu/l of soil), or a combination of both Ni and Cu, via soil without direct shoot exposure during their second growing period. The seedlings were either irrigated with spring water (pH 6) or got only natural rain during the whole field experiment. All seedlings were inoculated with conidia of a shoot-pathogen Gremmeniella abietina during their third growing season, and harvested the following spring. Lengths of shoots of different year-classes were used as growth estimates. In roots, the proportion of fungal (assumedly mycorrhizal) biomass was estimated by measuring ergosterol concentration. Guajacol peroxidase activity was measured. Short roots were classified into two groups according to their condition and the composition of the mycorrhizal community was expressed as a proportion of morphotypes in the roots. The seedlings exposed to additional Ni had higher shoot growth than the seedlings in the other treatments. The mean Ni concentration in the roots of seedlings exposed to additional Ni was 79 p.p.m. and in other seedlings 16 p.p.m. Additional Ni also decreased the frequency of clearly senescent short roots and the proportion of the mycorrhizal morphotype with the thinnest mantle. These results indicate that the Ni exposure levels used in this experiment had some positive effects on the seedlings. The relative fungal biomass was about 6% lower (p = 0.0981) in the fine roots of seedlings treated with additional Cu. The mean Cu concentration in the roots of seedlings exposed to additional Cu was 256 p.p.m. and in other seedlings 29 p.p.m. Peroxidase activity, which was used as a general stress indicator in this study, was not affected by any of the treatments. The shoot growth and the relative biomass of fungi in the fine roots were positively correlated in all seedlings, and this correlation was stronger in seedlings exposed to additional Ni that were not irrigated compared with seedlings not exposed to additional Ni that were irrigated. The frequency of asymptomatic infections of G. abietina was positively correlated with the proportion of senescent short roots in the irrigated seedlings but not in not-irrigated seedlings. The general condition of seedlings may be an important factor for infection by G. abietina when moisture is high enough for the fungi to infect seedlings by conidia.

Identifiers
urn:nbn:se:hig:diva-1006 (URN)10.1111/j.1439-0329.2004.00375.x (DOI)
Available from: 2007-12-12 Created: 2007-12-12 Last updated: 2018-03-13Bibliographically approved
Ahonen-Jonnarth, U., Göransson, A. & Finlay, R. (2003). Growth and nutrient uptake of ectomycorrhizal Pinus sylvestris seedlings treated with elevated Al concentrations and decreased levels of base cations. Tree Physiology, 23(3), 157-167
Open this publication in new window or tab >>Growth and nutrient uptake of ectomycorrhizal Pinus sylvestris seedlings treated with elevated Al concentrations and decreased levels of base cations
2003 (English)In: Tree Physiology, ISSN 0829-318X, E-ISSN 1758-4469, Vol. 23, no 3, p. 157-167Article in journal (Other academic) Published
Abstract [en]

Models of the effects of elevated concentrations of aluminum (Al) on growth and nutrient uptake of forest trees frequently ignore the effects of mycorrhizal fungi. In this study, we present novel data indicating that ectomycorrhizal mycelia may prevent leaching of base cations and Al. Mycorrhizal and non-mycorrhizal Pinus sylvestris L. seedlings were grown in sand obtained from the B-horizon of a local forest. In Experiment 1, non-mycorrhizal seedlings and seedlings inoculated with Hebeloma cf. longicaudum (Pers.: Fr.) Kumm. ss. Lange or Laccaria bicolor (Maire) Orton were provided with nutrient solution containing 2.5 mM Al. Aluminum did not affect growth of non-mycorrhizal seedlings or seedlings inoculated with L. bicolor. Seedlings colonized by H. cf. longicaudum had the highest biomass production of all seedlings grown without added Al, but the fungus did not tolerate Al. Shoots of seedlings colonized by L. bicolor had the lowest nitrogen (N) concentrations but the highest phosphorus (P) concentrations of all seedlings. The treatments had small but significant effects on shoot and root Al concentrations. In Experiment 2, inoculation with L. bicolor was factorially combined with the addition of a complete nutrient solution, or a solution lacking the base cations K, Ca and Mg, and solutions containing 0 or 0.74 mM Al. Seedling growth decreased in response to 0.74 mM Al, but the effect was significant only for non-mycorrhizal seedlings. Mycorrhizal seedlings generally had higher P concentrations than non-mycorrhizal seedlings. Aluminum reduced P uptake in non-mycorrhizal plants but had no effect on P uptake in mycorrhizal plants. Mycorrhizal colonization increased the pH of the soil solution by about 0.5 units and addition of Al decreased the pH by the same amount. We conclude that the presence of ectomycorrhizal mycelia decreased leaching of base cations and Al from the soil.

Identifiers
urn:nbn:se:hig:diva-1005 (URN)10.1093/treephys/23.3.157 (DOI)
Available from: 2007-12-12 Created: 2007-12-12 Last updated: 2018-03-13Bibliographically approved
Kuikka, K., Härmä, E., Markkola, A. M., Rauti, P., Roitto, M., Saikkonen, K., . . . Tuomi, J. (2003). Severe defoliation of Scots pine reduces reproductive investment by ectomycorrhizal symbionts. Ecology, 84(8), 2051-2061
Open this publication in new window or tab >>Severe defoliation of Scots pine reduces reproductive investment by ectomycorrhizal symbionts
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2003 (Swedish)In: Ecology, ISSN 0012-9658, E-ISSN 1939-9170, Vol. 84, no 8, p. 2051-2061Article in journal (Refereed) Published
Abstract [en]

Reduction in the photosynthetic capacity of plants is presumed to negatively affect their fungal symbionts. To test this hypothesis under natural conditions, we artificially removed 100% of previous year needles in two successive years on Scots pine trees (Pinus sylvestris L.) to simulate pine sawfly attack. Despite a decline in the shoot growth of defoliated trees, root biomass did not differ from control trees. The ergosterol (fungal biomass) and starch concentration of fine roots, however, slightly declined in defoliated trees. Percent ectomycorrhizal colonization of fine root tips remained high in both defoliated and control trees. The dominant tubercle morphotypes were slightly more abundant in the control than in defoliated trees. In contrast to the relatively weak effects on vegetative ectomycorrhizae, reproduction declined near the defoliated pines. Average sporocarp numbers and, consequently, the relative fungal investment to reproduction of the estimated total fungal biomass were more than three times higher near controls than defoliated trees in the first treatment year. Defoliation also reduced the diversity of ectomycorrhizal species producing sporocarps. Mutualistic fungal symbionts may thus alter their reproductive investment in response to restrictions on host resources. Because fungal biomass in the roots as well as colonization percentage remained unchanged, Scots pine evidently continues to invest in the maintenance of the symbiosis despite the reduced photosynthetic capacity due to defoliation.

Identifiers
urn:nbn:se:hig:diva-1036 (URN)10.1890/02-0359 (DOI)000185073100013 ()
Available from: 2007-12-12 Created: 2007-12-12 Last updated: 2018-03-13Bibliographically approved
Ahonen-Jonnarth, U. (2002). Dynamic web interface for metabolic pathways. In: Promote IT 2002. Paper presented at Promote IT 2002, Skövde, Sweden, April 22-24, 2002.
Open this publication in new window or tab >>Dynamic web interface for metabolic pathways
2002 (English)In: Promote IT 2002, 2002Conference paper, Published paper (Other academic)
Identifiers
urn:nbn:se:hig:diva-1004 (URN)
Conference
Promote IT 2002, Skövde, Sweden, April 22-24, 2002
Available from: 2007-12-12 Created: 2007-12-12 Last updated: 2018-03-13Bibliographically approved
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