Allelopathic effects of dominant ground vegetation species on initial growth of Pinus sylvestris L. seedlings in response to different temperature scenarios

The dominant species of ground vegetation cover in clear-cuts impact the regeneration of Scots pine forests due to the biochemical properties of these dominant species. Environmental conditions in clear-cuts, specifically increased light and temperature, can alter the biochemical impact of dominant...

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Bibliographic Details
Published in:IForest (Viterbo) 2019-02, Vol.12 (1), p.132-140
Main Authors: Sirgedaite-Šežiene, V, Baležentiene, L, Varnagiryte-Kabašinskiene, I, Stakenas, V, Baliuckas, V
Format: Article
Language:English
Subjects:
Air temperature
Allelopathy
Ambient temperature
Boreal forests
Carotenoids
Chlorophyll
Chlorophylls
Clear-cut
Clearcutting
Climate change
Coniferous forests
Dominant species
Environmental conditions
Germination
Laboratories
Metabolites
Physiological effects
Physiology
Pine
Pine trees
Pinus sylvestris
Plant diversity
Plant Extract
Plant growth
Plant species
Reforestation
Regeneration
Respiration
Seed germination
Seedlings
Seeds
Species diversity
Vaccinium vitis-idaea
Vegetation
Vegetation cover
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Summary:The dominant species of ground vegetation cover in clear-cuts impact the regeneration of Scots pine forests due to the biochemical properties of these dominant species. Environmental conditions in clear-cuts, specifically increased light and temperature, can alter the biochemical impact of dominant species on subsequent Scots pine regeneration processes. To investigate this, plant species diversity, frequency and cover were estimated in order to identify the dominant species of ground vegetation in clear-cut areas over a two-year period. Afterward, the impact of dominant species extracts on pine seed germination and seedling physiology at different temperature scenarios was evaluated. The species Pleurozium schreberi (Brid.) Mitt., Vaccinium vitis-idaea L. and Calluna vulgaris (L.) Hull were recorded as dominant in 1-yr-old clear-cut areas, and Vaccinium vitis-idaea L., Rumex acetosella L., and Calamagrostis epigejos (L.) Roth were dominant in 2-yr-old clear-cut areas. The prepared aqueous extracts of all dominant species exhibited strong inhibitory effects on pine seed germination and seedling morpho-physiological traits (the length of the radicle and hypocotyl; chlorophyll a, b, a/b and carotenoid content), resulting in the reduction of ex situ pine adaptive capacity at higher air temperature (24°C) compared to that at lower temperature (20°C). Significantly (p
ISSN:1971-7458
1971-7458
DOI:10.3832/ifor2904-012