umu.sePublications
Change search
Refine search result
1 - 5 of 5
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Rows per page
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sort
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
Select
The maximal number of hits you can export is 250. When you want to export more records please use the Create feeds function.
  • 1.
    Holm, S-O
    Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
    Den globala miljökrisen.2003In: Hela världen.: Samhälleliga och kulturella perspektiv på miljökrisen. / [ed] Öckerman, A., Friman E., Studentlitteratur AB, 2003Chapter in book (Other (popular science, discussion, etc.))
  • 2.
    Holm, Stig-Olof
    Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
    A Management Strategy for Multiple Ecosystem Services in Boreal Forests2015In: Journal of Sustainable Forestry, ISSN 1054-9811, E-ISSN 1540-756X, Vol. 34, no 4, p. 358-379Article in journal (Refereed)
    Abstract [en]

    A change of the forestry management approach where semi-natural forests are re-created after logging instead of tree plantations will contribute to a sustainable forestry. Such a change will increase resilience to damages on trees, thus contributing to a more reliable supply of wood, improve reindeer husbandry, and reduce climate-driving gases. Furthermore, re-creation of semi-natural forests will better secure biodiversity. Since adequate protection of many threatened forest species, however, is not compatible with even moderate logging, a functional conservation model also has to include total saving of parts of the forest landscape.

  • 3.
    Holm, Stig-Olov
    Umeå University.
    Reproductive patterns of birches (Betula spp.) in northern Sweden1994Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    The aim of this thesis was to study patterns of reproduction of Betula pendula and B. pubescens coll. along an altitudinal, coastal-inland, gradient in northern Sweden. The altitudinal variation was related to the distribution of the birch taxa along the gradient.

    Six years field data showed a steep decrease of seed germinability of B. pendula towards its altitudinal range limit in the Scandes every year. In contrast, B. pubescens ssp. pubescens showed significant positive correlations between seed germinability and altitude in three of the six years. Furthermore, there was a highly significant positive correlation between seed weight and altitude for B. pubescens coll., but not for B. pendula. Production of viable seeds fluctuated strongly between years in most populations, except in marginal B. pendula populations in the mountain area where it was constantly very low. On average 15 - 41 % of the seeds produced in B. pendula populations above 400 m altitude were attacked by gall midges (Semudobia ssp.). Corresponding values for B. pendula populations below 400 m altitude were 4 - 7 %. In B. pubescens populations, the seeds attacked by Semudobia ssp. never exceeded 3 %. The high frequency of Semudobia attackes in high altitude marginal B. pendula populations was suggested to be due to limited resources for defense against the seed predator.

    A 3-yr study documented large variations in pollination and seed quality between taxa, high and low altitude populations, and between years. Empty seeds (without embryos) dominated among the sampled seeds in most cases. This proportion was decreased by pollen addition, in both B. pendula and B. pubescens, in mountain populations, but not in coastal populations. The high percentage of empty seeds was therefore suggested to be partly caused by pollen-limitation, but failure of pollen tube penetration - fertilisation, or maternal resource supply could also have had an influence.

    A laboratory experiment showed increased pollen germination and length of the longest pollen tube per style after increased pollination. The correlations between number and length of pollen tubes per style were however mostly low in natural populations, suggesting low probability of pollen competition in the natural situation.

    Sowing experiments indicated that differences in initial seedling density between B. pendula and B. pubescens was more affected by interspecific differences in seed quality than by interspecific differences in survival of seedlings after establishment A study of the age structure of a B. pendula stand, planted about 250 m above its natural altitudinal limit, indicated that this birch may reproduce above its recent range limit during temporally warmer periods.

    It was concluded that the level of accumulated resources in B. pendula in marginal sites in the Scandes would mostly be too low for completion of the reproductive cycle. In contrast, B. pubescens ssp. pubescens is able to accumulate enough rescources for reproduction also at relative high altitudes.

  • 4.
    Holm, Stig-Olov
    et al.
    Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
    Englund, Göran
    Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
    Increased ecoefficiency and gross rebound effect: Evidence from USA and six European countries 1960-20022009In: Ecological Economics, ISSN 0921-8009, E-ISSN 1873-6106, Vol. 68, no 3, p. 879-887Article in journal (Refereed)
    Abstract [en]

    Despite increased efficiency in the use of natural resources, the use of these resources continues to increase in most societies. This paper examines the discrepancy between the potential decrease of use of natural resources, as an effect of increased efficiency, and actual use. During the period 1960–2002, this difference was found to grow faster in the USA than the mean for six West European countries. Possible reasons for this difference between the two regions are analysed. To reduce the anthropogenic flows of energy and material, and the consequent deleterious effects on the biosphere, it will become necessary to adapt consumption to degree of efficiency in the use of natural resources. Based on the comparison between the two regions, some economic aspects of this issue are discussed.

  • 5.
    Stjernström, Olof
    et al.
    Umeå University, Faculty of Social Sciences, Department of Social and Economic Geography.
    Myrlund, Håkan
    IES/Statsvetenskap, Luleå tekniska universitet.
    Holm, Stig-Olof
    Umeå University, Faculty of Science and Technology, Ecology and Environmental Science.
    Håkansson, Johan
    Umeå University, Faculty of Social Sciences, Department of Social and Economic Geography.
    Lindgren, Urban
    Umeå University, Faculty of Social Sciences, Department of Social and Economic Geography.
    Stage, Jesper
    Umeå University, Faculty of Social Sciences, Department of Economics.
    Westin, Kerstin
    Umeå University, Faculty of Social Sciences, Department of Social and Economic Geography.
    Westin, Lars
    Umeå University, Faculty of Social Sciences, Centre for Regional Science (CERUM).
    Wiberg, Ulf
    Umeå University, Faculty of Social Sciences, Department of Social and Economic Geography.
    Den hållbara regionen: Om förutsättningar och framtidsmöjligheter för en hållbar samhällsutveckling i Västerbottens län - ett projektförslag2001Report (Other academic)
1 - 5 of 5
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf