Carry-over benefit of high internal N pool on growth and function of oak seedlings (Quercus petraea) competing with Deschampsia cespitosa

Vernay, Antoine; Malagoli, Philippe; Fernández, M.a Concepción Sánchez; Pérot, Thomas; Améglio, Thierry; Balandier, Philippe

doi:10.1016/j.foreco.2018.03.039

Cited by 12 publications

(11 citation statements)

References 67 publications

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“…As a perspective, identifying and then quantifying such fluxes would be hugely informative to help gain a refined understanding of the underlying mechanisms. Second, interspecific competition could be amplified in N 89 /L 59 , becoming stronger than intraspecific grass competition (Vernay et al 2018). This process could be fostered by exudates which would act as signals in the rhizosphere, allowing self-recognition in a plant community (Delory, Delaplace, Fauconnier, & du Jardin 2016).…”

Section: How To Explain the Positive Effect Of Oak Seedling On D Cesmentioning

confidence: 99%

“…Because the presence of oak had an unexpected positive effect on D. cespitosa growth when N fertilizer was added, field fertilization cannot be recommended (Coll et al 2004;Salifu, Jacobs, & Birge 2009). Use of preliminary N-loaded oak seedlings coming from a nursery would allow oak to benefit from its own internal N-reserve, improving its survival and its resistance to grass-driven N-depletion (Salifu & Timmer 2001;Villar-Salvador et al 2012;Vernay et al 2018). Another solution would be to consider foliar fertilization, allowing to target oak seedlings more specifically without fertilizing understory species (Gagnon & Deblois 2014).…”

Section: Foster Oak Regeneration In Practicementioning

confidence: 99%

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Improved Deschampsia cespitosa growth by nitrogen fertilization jeopardizes Quercus petraea regeneration through intensification of competition

Vernay

Malagoli

Fernández

et al. 2018

Basic and Applied Ecology

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Plant-plant interactions show differential responses to different combinations of available resources that has been underexplored. The short-term functional response of Quercus petraea seedlings and Deschampsia cespitosa tufts grown alone or in mixture was monitored in contrasting combinations of soil inorganic nitrogen × light availabilities in a greenhouse experiment. Growth, biomass allocation, functional traits and resource acquisition were quantified. Intensity and importance of interactions were calculated by organ biomass-based indices. Competition exerted by D. cespitosa on oak was primarily driven by light availability and secondly, for each light level, by nitrogen supply, leading to a strong hierarchy of resource combinations for each considered plant organ. Under high light, oak preferentially allocated biomass to the roots, underlining the indirect role of light on the belowground compartment. Unexpectedly, Deschampsia cespitosa grew better in the presence of oak seedlings under high nitrogen supply whatever the light availability. Oak short-term nitrogen storage instead of investment in growth might be a long-term strategy to survive D. cespitosa competition. Why Deschampsia had a higher biomass in the presence of oak under nitrogen fertilization is an intriguing question. The role of root exudates or change in balance between intravs interspecific interactions may hold the answer. There may be an active mechanism of competition rather than only competitive resource exploitation. Forest managers sometimes practice adding nitrogen fertilizer to improve oak seedling growth in plantations or natural regeneration. Here, the higher biomass in mixture to the benefit of the competitor clearly questions this practice: oak may provide extra nitrogen to competitors during the early period of plant-plant interaction or it may influence the balance between intravs interspecific interactions. The identification and quantification of active competition may result in new practices for a broad diversity of plant-plant interactions such as tree regeneration, intercrop management and weed control in agriculture.

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Section: How To Explain the Positive Effect Of Oak Seedling On D Cesmentioning

confidence: 99%

Section: Foster Oak Regeneration In Practicementioning

confidence: 99%

Improved Deschampsia cespitosa growth by nitrogen fertilization jeopardizes Quercus petraea regeneration through intensification of competition

Vernay

Malagoli

Fernández

et al. 2018

Basic and Applied Ecology

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“…On the other hand, Kitao et al (2015) suggested that C allocation is increased into the shoot and leaves under elevated O 3 concentrations for Q. mongolica while similar tendency was not observed for other species (Watanabe et al, 2008). Additionally, Q. mongolica often shows partly determinant growth, i.e., additional shoot elongation, as a response to the change in environment (Kitao et al, 2006), and Quercus species carried C synthesized in a given year over to the additional growth in the next year (e.g., Vernay et al, 2018). The key to high O 3 concentration tolerance may be a change in the C allocation pattern, which is induced by partly determinant growth type and carry-over effect, that may be specific to this tree species.…”

Section: Discussionmentioning

confidence: 85%

Composition of Organic Carbon-Based Compounds in the Stem Wood of Quercus mongolica Seedlings Grown Under Elevated CO2 and/or O3 Concentrations

Ugawa

Hirano

Hashida

et al. 2021

Front. For. Glob. Change

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In this study, we examined the composition of organic constituents of stem woody tissue together with tree growth in Quercus mongolica var. grosseserrata Blume seedlings raised under controlled CO2 and/or O3 concentrations in a Free-Air Concentration Enrichment system. After exposure to ambient air (control), elevated CO2 concentration (550 μmol mol–1 CO2), elevated O3 concentration (double that of the control), and a combination of elevated CO2 and O3 concentrations during a growing season, we measured the diameter and length of stem, and biomass of sampled seedlings and quantified the lignin, extractive, and holocellulose contents of the woody tissue of current-year stems. We confirmed that the growth of seedlings was enhanced under an elevated CO2 concentration condition. In line with this, the extractive content was lower in woody tissue formed under an elevated CO2 concentration than that formed under ambient air, whereas holocellulose content showed an inverse pattern. Elevated O3 concentration itself did not change the organic constituents of the woody tissue, but it reduced the influence of an elevated CO2 concentration. We thus assume that Q. mongolica formed woody tissue with a low extractive content under the high CO2 concentration condition, although this response was possibly mitigated by an elevated O3 concentration. Extractives contains antimicrobial components such as tannins, flavonoids, quinones, and terpenoids. The decrease in extractives within the widely distributed Q. mongolica in East Asia may have a non-negligible impact on C cycling in the future earth with high atmospheric CO2 concentration.

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“…A common case is the regeneration of valuable oak species such as Quercus petraea in temperate forests, which is often jeopardized by the presence of interfering understorey species such as Molinia caerulea, a widespread monopolistic grass (Taylor et al, 2001). For instance, competition by exploitation for N-resources in favour of moor grass was described as a major reason for oak regeneration failure (Vernay et al, 2018a(Vernay et al, , 2018b. However, the respective importance of allelopathy in oak-grass interactions remains to be unravelled (Becker and Lévy, 1982;Timbal et al, 1990).…”

Section: Introductionmentioning

confidence: 99%

Investigating the role of root exudates in the interaction between oak seedlings and purple moor grass in temperate forest

Fernández

Malagoli

Gallet

et al. 2021

Forest Ecology and Management

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Carry-over benefit of high internal N pool on growth and function of oak seedlings (Quercus petraea) competing with Deschampsia cespitosa

Cited by 12 publications

References 67 publications

Improved Deschampsia cespitosa growth by nitrogen fertilization jeopardizes Quercus petraea regeneration through intensification of competition

Improved Deschampsia cespitosa growth by nitrogen fertilization jeopardizes Quercus petraea regeneration through intensification of competition

Composition of Organic Carbon-Based Compounds in the Stem Wood of Quercus mongolica Seedlings Grown Under Elevated CO2 and/or O3 Concentrations

Investigating the role of root exudates in the interaction between oak seedlings and purple moor grass in temperate forest

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