Triin Triisberg "Factors influencing the re-vegetation of abandoned extracted peat lands in Estonia" | University of Tartu

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Contacts of UT units

Faculty of Arts and Humanities
Faculty phone: 
+372 737 5341
Faculty address: 
Jakobi 2, rooms 116–121, 51005 Tartu
  • Dean's Office
    Faculty phone: 
    + 372 737 5341
    Faculty address: 
    Jakobi 2, rooms 116–121, 51005 Tartu
  • Institute of History and Archaeology
    Faculty phone: 
    +372 737 5651
    Faculty address: 
    Jakobi 2, 51005 Tartu
  • Institute of Estonian and General Linguistics
    Faculty phone: 
    +372 737 5221
    Faculty address: 
    Jakobi 2, 51005 Tartu
  • Institute of Philosophy and Semiotics
    Faculty phone: 
    +372 737 5314
    Faculty address: 
    Jakobi 2, rooms 309–352, 51005 Tartu
  • Institute of Cultural Research
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    Faculty address: 
    Ülikooli 16, 51003 Tartu
  • School of Theology and Religious Studies
    Faculty phone: 
    +372 737 5301
    Faculty address: 
    Ülikooli 18–310, 50090 Tartu
  • College of Foreign Languages and Cultures
    Faculty address: 
    J. Liivi 4, 50409, Tartu
  • Viljandi Culture Academy
    Faculty phone: 
    +372 435 5232
    Faculty address: 
    Posti 1, 71004 Viljandi
Faculty of Social Sciences
Faculty phone: 
+372 737 5957
Faculty address: 
Lossi 36, 51003 Tartu
  • Dean's Office
    Faculty phone: 
    + 372 737 5900
    Faculty address: 
    Lossi 36, 51003 Tartu
  • Institute of Education
    Faculty phone: 
    +372 737 6440
    Faculty address: 
    Salme 1a–29, 50103 Tartu
  • Johan Skytte Institute of Political Studies
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    +372 737 5582
    Faculty address: 
    Lossi 36–301, 51003 Tartu
  • School of Economics and Business Administration
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    Narva mnt 18, 51009 Tartu
  • Institute of Psychology
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Faculty of Medicine
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  • Institute of Biomedicine and Translational Medicine
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  • Institute of Pharmacy
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    Faculty address: 
    Jakobi 5–205, 51005 Tartu
Faculty of Science and Technology
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Vanemuise 46–208, 51014 Tartu
  • Dean's Office
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    Faculty address: 
    Vanemuise 46–208, 51003 Tartu
  • Institute of Computer Science
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    Narva mnt 18, 51009 Tartu
  • Estonian Marine Institute
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    Mäealuse 14, 12618 Tallinn
  • Institute of Physics
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  • Institute of Chemistry
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    Faculty address: 
    Ravila 14a, 50411 Tartu
  • Institute of Mathematics and Statistics
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    Narva mnt 18, 51009 Tartu
  • Institute of Molecular and Cell Biology
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  • Tartu Observatory
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  • Institute of Technology
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    Nooruse 1, 50411 Tartu
  • Institute of Ecology and Earth Sciences
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    Faculty address: 
    Vanemuise 46, 51003 Tartu
Institutions
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    +372 737 5702
    Faculty address: 
    W. Struve 1, 50091 Tartu
  • Youth Academy
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    Faculty address: 
    Uppsala 10, 51003 Tartu
  • Institute of Genomics
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    +372 737 4000
    Faculty address: 
    Riia 23b, 51010 Tartu
  • Museum
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    Lossi 25, 51003 Tartu
  • University of Tartu Natural History Museum and Botanical Garden
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    Vanemuise 46, 51003 Tartu
Support Units
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  • Centre for Entrepreneurship and Innovation
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    Faculty address: 
    Narva mnt 18, 51009, Tartu
  • University Office in Tallinn
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    Faculty address: 
    Teatri väljak 3, 10143 Tallinn
  • Estates Office
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    Faculty address: 
    Ülikooli 18a, 51005 Tartu
  • Finance Office
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    Jakobi 4, 51005 Tartu
  • Grant Office
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    Raekoja plats 9, 51004 Tartu
  • Information Technology Office
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  • Marketing and Communication Office
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    Ülikooli 18, rooms 102, 104, 209, 210, 50090 Tartu
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    Faculty address: 
    Ülikooli 18, 50090 Tartu
  • Procurement Office
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    Faculty address: 
    Ülikooli 18a, 51005 Tartu
  • Rector's Strategy Office
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    Ülikooli 18, 50090 Tartu
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  • University of Tartu Press
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Other Units
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    Faculty address: 
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    Faculty address: 
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  • Tartu University Hospital
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  • University of Tartu Foundation
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  • View all other units

Triin Triisberg "Factors influencing the re-vegetation of abandoned extracted peat lands in Estonia"

Date: 
06.06.2014 - 10:15 to 13:00

Thesis supervisors:
Dr. Edgar Karofeld, University of Tartu
Prof. Jaanus Paal, University of Tartu

Opponent:
Prof. Eeva-Stiina Tuittila, School of Forest Sciences, University of Eastern Finland, Finland

Summary:
Estonia is one of the most peatland rich countries in the world. The peatlands are here widely drained for forestry, agriculture and peat production. In former times, peat was extracted as block-cut peat, and that had a rather limited impact on surroundings; in the middle of the 20th century a peat milling technique was taken into use that raised rapidly the volume of peat extraction and increased the area of abandoned extracted peatlands. The total area of extracted peatlands is currently 9371 ha, but in the coming decades it will be doubled. Extracted peatlands influence the hydrological regime and microclimate of the neighbourhood, reduce bio-diversity, increase greenhouse gas emission and are risk of fires. The spontaneous re-vegetation of extracted peatlands is a very slow process, because of the totally depleted or spoiled seed bank; therefore only some propagules that arrive by wind can germinate, survive and form a plat cover on those areas. The recovery of vegetation is inhibited by unfavourable environmental factors: unstable and unfavourable moisture conditions, wind erosion and frost heaving. According to the legislative acts all those areas should be recultivated/rehabilitated. However, in Estonia only few extracted peatland areas have been restored so far.

The main aim of this PhD-theses was (i) to determine the environmental factors affecting the re-vegetation of the abandoned extracted peatlands, (ii) to clarify the differences of the re-vegetation processes in the central and marginal parts of extracted peatlands, (iii) using a greenhouse experiment to ascertain how the fertilization and favourable moisture conditions influences the germination and species richness and, (iv) to determine if some general environmental factors, such as the properties and the depth of residual peat can be used as indicators for restoration planning.

The results from the field studies and inventory of extracted peatlands showed that the main factors influencing the re-vegetation are former treatment, surface microform, and peat properties. Species richness on extracted peatlands decreased from the edges bordering with naturally vegetated areas towards central parts. However, results from the greenhouse experimental study showed that instead of the adjacent vegetated area better moisture conditions enabled the growth of many plant species. A single application of fertilizer did not have an effect on the total number of plant species on extracted peatland, but increased the plant cover and the mean number of species. Neither did the fertilizer have an overall influence on the number of species in the greenhouse experiment. It indicates that the re-vegetation of extracted peatlands is more affected by the moisture conditions than by the lack of nutrients. The re-vegetation of extracted peatlands is also influenced by the depth of the residual peat and its properties. The threshold for choosing the appropriate target community for restoration appeared to be 2.3 m: areas with residual peat depth thinner than 2.3 m should be restored towards fen or transitional mire and areas with residual peat depth over that value towards raised bog communities. If restoration towards bog communities is possible, the microhabitat variability could be additionally supported by creating mounds and furrows positioned perpendicular with ditches. The re-vegetation process can also be accelerated by introducing plant material and creating suitable moisture conditions.

Location: 
Lai 40-218
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