Interactive effects of defoliation and water deficit on growth, water status, and mortality of black spruce (Picea mariana (Mill.) B.S.P.)
Autor: | Annie Deslauriers, Hibat Allah Bouzidi, John MacKay, Lorena Balducci |
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Jazyk: | angličtina |
Rok vydání: | 2019 |
Předmět: |
0106 biological sciences
Irrigation regimes Secondary growth [SDV]Life Sciences [q-bio] Forest management Biology Vitality 010603 evolutionary biology 01 natural sciences Twig Bud phenology Black spruce saplings Ecology Phenology fungi food and beverages Forestry 15. Life on land Biotic stress Black spruce Spruce budworm Agronomy 13. Climate action Defoliation Instar Primary growth Physiological parameters 010606 plant biology & botany |
Zdroj: | Annals of Forest Science Annals of Forest Science, Springer Nature (since 2011)/EDP Science (until 2010), 2019, 76 (1), pp.21. ⟨10.1007/s13595-019-0809-z⟩ |
ISSN: | 1286-4560 1297-966X |
Popis: | Key message Defoliation followed by water deficit showed time-dependent effects on plant water status and growth in black spruce ( Picea mariana (Mill.) B.S.P.). Biotic stress negatively (during active defoliation by growing instars) and positively (after defoliation) affected plant water relations. However, water deficit, alone or combined with defoliation, prevails over defoliation-related stress for radial growth and sapling vitality. Context Tree vitality is influenced by multiple factors such as insect damage, water deficit, and the timing of these stresses. Under drought, positive feedback via the reduction of leaf area may improve the water status of defoliated trees. However, the effect on tree mortality remains largely unknown. Aims We investigated the effects of defoliation followed by a water deficit on tree growth, plant water status, and mortality in black spruce (Picea mariana (Mill.) B.S.P.) saplings. Methods In a controlled greenhouse setting, saplings were submitted to combined treatments of defoliation and water stress. To assess the impact of these stresses and their interaction, we measured phenology, twig development, secondary growth of the stem, water potential, and mortality of the saplings. Results Both defoliation and water deficits reduced growth; however, the effect was not additive. During active defoliation, we observed a higher evaporative demand and a lower midday leaf water potential Ψmd. We observed an opposite pattern of response post-stress. Drought alone increased sapling mortality immediately after the stress period, but after c.a. 20 days, mortality rates remained similar following combined drought and defoliation. Conclusion Our results highlight two key periods during which defoliation affects plant water relations either negatively (during active defoliation) or positively (after defoliation). Mortality in defoliated saplings was reduced immediately following drought because available internal water increased in the stem. |
Databáze: | OpenAIRE |
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