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| Titel |
Peat soil composition as indicator of plants growth environment |
| VerfasserIn |
M. Noormets, T. Tonutare, K. Kauer, L. Szajdak, R. Kolli |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250025326
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| Zusammenfassung |
| Exhausted milled peat areas have been left behind as a result of decades-lasting
intensive peat production in Estonia and Europe. According to different data there in
Estonia is 10 000 – 15 000 ha of exhausted milled peat areas that should be vegetated.
Restoration using Sphagnum species is most advantageous, as it creates ecological
conditions closest to the natural succession towards a natural bog area. It is also
thought that the large scale translocation of vegetation from intact bogs, as used
in some Canadian restoration trials, is not applicable in most of European sites
due to limited availability of suitable donor areas. Another possibility to reduce
the CO2 emission in these areas is their use for cultivation of species that requires
minimum agrotechnical measures exploitation. It is found by experiments that it is
possible to establish on Vaccinium species for revegetation of exhausted milled peat
areas.
Several physiological activity of the plant is regulated by the number of phytohormones.
These substances in low quantities move within the plant from a site of production to a site of
action. Phytohormone, indole-3-acetic acid (IAA) is formed in soils from tryptophane
by enzymatic conversion. This compound seems to play an important function in
nature as result to its influence in regulation of plant growth and development. A
principal feature of IAA is its ability to affect growth, development and health of
plants. This compound activates root morphology and metabolic changes in the host
plant. The physiological impact of this substance is involved in cell elongation,
apical dominance, root initiation, parthenocarpy, abscission, callus formation and the
respiration.
The investigation areas are located in the county of Tartu (58Ë 22’ N, 26Ë 43’ E), in the
southern part of Estonia. The soil of the experimental fields belongs according to the WRB
soil classification, to the soils subgroups of Fibri–Dystric Histosols. The investigation areas
were chosen by following criteria: (1) plantcover age; (2) cultivated plant species; (3) utilized
agrotechnology; (4) comparisons between different factors were created by using natural
growth areas of Vaccinaceae (natural bog area, Vaccinaceae growth area on mineral soil). For
the investigation is important to choose areas with different age of plant covers,
because according to plants age the surface of exhausted peat land will be covered in
relation to the width of plants. The purpose of current article is to investigate the
biological and chemical parameters co-influences in peat soil. Thus, the major interest is
on the plant growth hormone indole-3-acetic acid distribution and dynamics in
peat soil and dependence of plant cover, also its influence to the plants growth.
Moreover, its contribution to yield and new growth area invasion will be discussed. |
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