The dark side of nursery photoperiod reduction on summer plantation performance of a temperate conifer: High winter mortality mediated by reduced seedling carbohydrate and nitrogen storage

Luo, Na; Villar-Salvador, Pedro; Li, Guolei

doi:10.1016/j.foreco.2021.119171

Cited by 7 publications

(3 citation statements)

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“…In the GS2020, seedlings exposed to drought showed higher NSC but lower growth than control ( Figures 2 , 5 ). It is possible that seedlings sacrificed growth to maintain higher NSC for subsequent C use (e.g., osmoregulation) (Huang et al, 2021 ; Luo et al, 2021 ). In addition, as a drought-defoliation species, Jezo spruce fell off leaves to protect the hydraulic system, which may also stimulate C accumulation in branches and roots (Santos et al, 2022 ).…”

Section: Discussionmentioning

confidence: 99%

Seasonal Responses of Hydraulic Function and Carbon Dynamics in Spruce Seedlings to Continuous Drought

et al. 2022

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Drought is expected to increase in the frequency and duration associated with climate change. Although hydraulic function and carbon (C) storage have been widely recognized as key components to plant survival under a single drought, the physiological responses to continuous drought remain largely unknown, particularly for high northern temperate and boreal forests which are sensitive to water stress. In this study, we quantified the survival, growth, gas exchange, water relations, and nonstructural carbohydrates (NSCs) in 3-year-old Jezo spruce (Picea jezoensis) seedlings responding to continuous drought stress. Seedlings were maintained in drought conditions for 392 days, covering two growing and one dormant winter season. Seedlings subjected to drought showed a significant decrease in net photosynthesis rate (Anet) and stomatal conductance (gs) in both growing seasons, and biomass in the second growing season. The seedling mortality continuously increased to 35.6% at the experimental end. Notably, responses of C storage and leaf water potential to drought varied greatly depending on seasons. Living seedlings exposed to drought and control treatments had similar NSC concentrations in both growing seasons. However, seedlings with concentrations of both the soluble sugars and starch less than 1% in root died in the winter dormant season. In the second growing season, compared with the control treatment, droughted seedlings had significantly lower leaf water potential and stem wood-specific hydraulic conductivity (Kw). Meanwhile, the leaf predawn water potential did not recover overnight. These suggest that C starvation might be an important reason for seedlings that died in the winter dormant season, while in the growing season drought may limit seedling survival and growth through inducing hydraulic failure. Such seasonal dependence in hydraulic dysfunction and C depletion may lead to higher mortality in spruce forests facing extended drought duration expected in the future.

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Section: Discussionmentioning

confidence: 99%

Seasonal Responses of Hydraulic Function and Carbon Dynamics in Spruce Seedlings to Continuous Drought

et al. 2022

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“…Although intact tropical forest growth is likely suffering from warming and moisture stress induced by anthropogenic greenhouse gas emissions (Aguirre-Gutiérrez et al, 2020;Doughty et al, 2015;Gatti et al, 2021;Hubau et al, 2020), light is still the primary factor limiting tropical tree growth due to cloud cover, especially during the rainy season (Boisvenue and Running, 2006;Graham et al, 2003). Studies on the photoperiodic control of tropical tree growth typically fall into two categories: physiological field observations under seasonal variations of day length (Borchert et al, 2005;Pires et al, 2018;Rivera et al, 2002) and physiological greenhouse observations under experimental variations of the photoperiod (Dixit and Singh, 2014;Djerrab et al, 2021;Luo et al, 2021;Stubblebine et al, 1978). Field observations have shown that longer photoperiods facilitate bud break and flowering in tropical forests (Borchert et al, 2005;Pires et al, 2018;Rivera et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

“…Field observations have shown that longer photoperiods facilitate bud break and flowering in tropical forests (Borchert et al, 2005;Pires et al, 2018;Rivera et al, 2002). Greenhouse experiments either lengthen or shorten photoperiods, and results suggest that short photoperiods reduce plant growth rate and lead to thinner leaves and lower chlorophyll content (Djerrab et al, 2021;Luo et al, 2021), while long photoperiods increase stem growth rate and stimulate tree growth (Dixit and Singh, 2014;Stubblebine et al, 1978). These studies are more focused on specific tropical plant species and tend to agree that longer photoperiods might have a positive effect on vegetative growth in tropical forests.…”

Section: Introductionmentioning

confidence: 99%

Exploration of a novel geoengineering solution: lighting up tropical forests at night

et al. 2022

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Abstract. Plants primarily conduct photosynthesis in the daytime, offering an opportunity to increase photosynthesis and carbon sink by providing light at night. We used a fully coupled Earth system model to quantify the carbon sequestration and climate effects of a novel carbon removal proposal: lighting up tropical forests at night via lamp networks above the forest canopy. Simulation results show that additional light increased the tropical forest carbon sink by 10.4±0.05 Pg of carbon per year during a 16-year lighting experiment, resulting in a decrease in atmospheric CO2 and suppression of global warming. In addition, local temperature and precipitation increased. The energy requirement for capturing 1 t of carbon is lower than that of direct air carbon capture. When the lighting experiment was terminated, tropical forests started to release carbon slowly. This study suggests that lighting up tropical forests at night could be an emergency solution to climate change, and carbon removal actions focused on enhancing ecosystem productivity by altering environmental factors in the short term could induce post-action CO2 outgassing.

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The contribution of acorn and soil N to early development of Chinese cork oak (Quercus variabilis Blume) seedlings under contrasting soil fertility conditions

Zhao,

Villar-Salvador,

2024

Trees

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The dark side of nursery photoperiod reduction on summer plantation performance of a temperate conifer: High winter mortality mediated by reduced seedling carbohydrate and nitrogen storage

Cited by 7 publications

References 50 publications

Seasonal Responses of Hydraulic Function and Carbon Dynamics in Spruce Seedlings to Continuous Drought

Seasonal Responses of Hydraulic Function and Carbon Dynamics in Spruce Seedlings to Continuous Drought

Exploration of a novel geoengineering solution: lighting up tropical forests at night

The contribution of acorn and soil N to early development of Chinese cork oak (Quercus variabilis Blume) seedlings under contrasting soil fertility conditions

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