Allelopathic effects of dominant ground vegetation species on initial growth of Pinus sylvestris L. seedlings in response to different temperature scenarios
Vaida Sirgedaite-Šežiene (1) , Ligita Baležentiene (2), Iveta Varnagiryte-Kabašinskiene (1), Vidas Stakenas (1), Virgilijus Baliuckas (1)
iForest - Biogeosciences and Forestry, Volume 12, Issue 1, Pages 132-140 (2019)
doi: https://doi.org/10.3832/ifor2904-012
Published: Feb 27, 2019 - Copyright © 2019 SISEF
Research Articles
Abstract
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<0.05) stronger inhibitory effects of root and shoot extracts produced from all dominant species on chlorophyll a, b and a/b content were recorded at higher temperature (22-24°C) compared to lower (20°C) temperature. A significantly lower content of carotenoids was observed in the control (24°C) temperature. Thus, a high increase of ambient temperature may cause unfavourable conditions for Scots pine seedling growth in boreal forests.
Keywords
Carotenoids, Chlorophylls, Clear-cut, Germination, Plant Extract
Authors’ Info
Authors’ address
Iveta Varnagiryte-Kabašinskiene
Vidas Stakenas
Virgilijus Baliuckas
Institute of Forestry, Lithuanian Research Centre for Agriculture and Forestry, LT-53101 (Lithuania)
Institute of Environment and Ecology, Aleksandras Stulginskis University, LT-53361 (Lithuania)
Corresponding author
Paper Info
Citation
Sirgedaite-Šežiene V, Baležentiene L, Varnagiryte-Kabašinskiene I, Stakenas V, Baliuckas V (2019). Allelopathic effects of dominant ground vegetation species on initial growth of Pinus sylvestris L. seedlings in response to different temperature scenarios. iForest 12: 132-140. - doi: 10.3832/ifor2904-012
Academic Editor
Silvano Fares
Paper history
Received: Jun 25, 2018
Accepted: Dec 28, 2018
First online: Feb 27, 2019
Publication Date: Feb 28, 2019
Publication Time: 2.03 months
Copyright Information
© SISEF - The Italian Society of Silviculture and Forest Ecology 2019
Open Access
This article is distributed under the terms of the Creative Commons Attribution-Non Commercial 4.0 International (https://creativecommons.org/licenses/by-nc/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
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