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Published on: September 27, 2024
Delayed soil thawing affects root and shoot functioning and growth in Scots pine.
Tapani Repo1, Tarja Lehto, Leena Finér
1The Finnish Forest Research Institute, Joensuu Research Unit, P.O. Box 68, FI-80101 Joensuu, Finland. tapani.repo@metla.fi
Delayed soil frost in boreal regions significantly hinders Scots pine sapling growth by impeding root development and water transport. Prolonged freezing can be lethal, impacting forest regeneration and ecosystem health.
Area of Science:
- Environmental Science
- Plant Physiology
- Forest Ecology
Background:
- Boreal regions experience delayed soil thawing post-winter, impacting early-season plant development.
- Scots pine (Pinus sylvestris L.) saplings are vital to boreal ecosystems but sensitive to soil conditions.
Purpose of the Study:
- To investigate the effects of pre-growing season and early growing season soil frost on Scots pine sapling root and water relations.
- To determine the impact of delayed soil thawing on sap flow, physiological stress, and root growth.
Main Methods:
- Controlled environment experiment with Scots pine saplings subjected to different soil frost treatments.
- Monitoring sap flow, electrical impedance, relative electrolyte leakage, and root growth.
Main Results:
- Delayed soil thawing inhibited or delayed sap flow, increased physiological stress indicators (electrical impedance, electrolyte leakage).
- Prolonged soil frost significantly reduced or halted root growth.
- Sap flow dynamics were influenced by thaw timing, light, temperature, phenology, and canopy condition.
Conclusions:
- Delayed soil thawing negatively impacts Scots pine sapling physiology and growth.
- Severe or prolonged soil frost can lead to mortality, threatening boreal forest resilience.
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