Waterlogging and soil freezing during dormancy affected root and shoot phenology and growth of Scots pine saplings

Autor:	Sirkka Sutinen, Tarja Lehto, Ai-Fang Wang, Marja Roitto, Tapani Repo, Timo Domisch
Rok vydání:	2019
Předmět:	0106 biological sciences 0301 basic medicine Physiology Plant Science Biology Plant Roots 01 natural sciences Soil 03 medical and health sciences Freezing Chlorophyll fluorescence Finland Phenology Taiga Scots pine Pinus sylvestris 15. Life on land Plant Dormancy biology.organism_classification Floods Horticulture 030104 developmental biology Boreal 13. Climate action Shoot Soil water Dormancy Plant Shoots 010606 plant biology & botany
Zdroj:	Tree Physiology. 39:805-818
ISSN:	1758-4469
DOI:	10.1093/treephys/tpz003
Popis:	Soil waterlogging is predicted to increase in the future climate in boreal regions due to increased precipitation. Snowmelt periods in winter may also become more common and further increase the amount of water in soil. It is not well known how waterlogging and soil freezing during winter affect the physiology, phenology and growth of trees. Our aim was to study the below- and aboveground responses of Scots pine (Pinus sylvestris L.) saplings to waterlogging (WL) in frozen (Fr) and unfrozen (NoFr) soils in a growth chamber experiment. The soil was either -2 °C or +2 °C and either waterlogged or not in a split-plot design for 6 weeks during dormancy, with similar air conditions in all treatments, which were Fr + WL, NoFr + WL, Fr + NoWL and NoFr + NoWL. Needles showed a shift towards a deeper dormancy in frozen than unfrozen soil in terms of chlorophyll fluorescence (Fv/Fm), water potential and apoplastic electrical resistance. In spring, initiation of shoot elongation started earlier if the soil was frozen during dormancy. In Fr + WL, initiation of root growth was delayed by 20 days compared with other treatments; after that, the root growth peaked at the same time as needle elongation. Needles remained smaller in Fr + WL than in the other treatments, indicating that roots formed a strong sink for carbon. Shoot and root biomass were not negatively affected by waterlogging if the soil remained unfrozen. In Fr + WL, survival and growth capacity of new terminal and whorl buds, the number of bud scales and the number of dwarf shoots were reduced. We conclude that soil freezing on sites prone to waterlogging should be considered in management of boreal forests, especially in the face of predicted climate change.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::64146d625f9d2d9b34159ef4c0a0f8aa https://doi.org/10.1093/treephys/tpz003 Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
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