Photosynthesis capacity of Quercus petraea (Matt.) saplings is affected by Molinia caerulea (L.) under high irradiance

Vernay, Antoine; Balandier, Philippe; Guinard, Ludivine; Améglio, Thierry; Malagoli, Philippe

doi:10.1016/j.foreco.2016.05.045

Cited by 11 publications

(15 citation statements)

References 51 publications

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“…L 27 and N 0 ). This is consistent with common findings in the literature (Baribault & Kobe 2011;Vernay et al 2016) reporting weaker competition under low light and nutrient availability, as competitive species free up their space for stress-tolerant species (Grime 1974;Pierret et al 2016).…”

Section: Fig 5 Soil Nitrate (Nosupporting

confidence: 92%

“…More than 90% of 15 N applied was massively absorbed by D. cespitosa tufts, in line with previous studies(Coll, Balandier, & Picon-Cochard 2004;Vernay et al 2016). …”

supporting

confidence: 92%

“…Total N content and 15 N isotopic abundance were determined by isotope-ratio mass spectrometry at the PTEF OC 081 (Nancy) functional ecology platform. Labeling methods and associated calculations are detailed in Vernay, Balandier, Guinard, Améglio, and Malagoli (2016).…”

Section: N Labelingmentioning

confidence: 99%

“…Second, for a given amount of light, adding the N soil resource increased both the intensity and importance of competition on oak. This would suggest that greater light availability may lead to higher carbon gain by D. cespitosa (Vernay et al 2016). This extra amount of carbon would indirectly promote root system growth and thus pre-emption of N soil .…”

Section: Fig 5 Soil Nitrate (Nomentioning

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: Fig 5 Soil Nitrate (Nosupporting

confidence: 92%

“…More than 90% of 15 N applied was massively absorbed by D. cespitosa tufts, in line with previous studies(Coll, Balandier, & Picon-Cochard 2004;Vernay et al 2016). …”

supporting

confidence: 92%

Section: N Labelingmentioning

confidence: 99%

Section: Fig 5 Soil Nitrate (Nomentioning

confidence: 99%

See 2 more Smart Citations

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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“…Eriopohorum angustifolium are also rather large (up to 70, often around 20 µmol m -2 s -1 ). Inititial quantum yield estimates of plants also common in in the vegetated strips in Himmelmoor range between 0.02 and 0.08 (Vernay et al, 2016;Nygren and Kellomäki, 1983;Murchie and Horton, 1997;Kaipiainen, 2009;Chen et al, 2010).…”

Section: Model Performancementioning

confidence: 99%

Comparison of eddy covariance CO2 and CH4 fluxes from mined and recently rewetted sections in a NW German cutover bog

Holl¹,

Pfeiffer²,

Kutzbach³

2019

Preprint

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Abstract. With respect to their role in the global carbon cycle, natural peatlands are characterized by their ability to sequester atmospheric carbon. This trait is strongly connected to the water regime of these ecosystems. Large parts of the soil profile in natural peatlands are water-saturated, leading to anoxic conditions and to a diminished decomposition of plant litter. In functioning peatlands, the rate of carbon fixation by plant photosynthesis is larger than the decomposition rate of dead organic material. Over time, the amount of carbon that remains in the soil and is not converted back to carbon dioxide grows. Land use of peatlands often goes along with water level manipulations and thereby with alterations of carbon flux dynamics. In this study, carbon dioxide (CO2) and methane (CH4) flux measurements from a bog site in NW Germany that has been heavily degraded by peat mining are presented. Two contrasting types of management have been implemented at the site: (1) drainage during ongoing peat-harvesting on one half of the central bog area and (2) rewetting on the other half that had been taken out of use shortly before measurements commenced. The presented two-year data set was collected with an eddy covariance (EC) system set up on a central railroad dam that divides the two halves of the (former) peat harvesting area. We used footprint analysis to split the obtained CO2 and CH4 flux time series into data characterizing the gas exchange dynamics of both contrasting land use types individually. The time series gaps resulting from data division were filled using the response of artificial neural networks (ANNs) to environmental variables, footprint variability and fuzzy transformations of seasonal and diurnal cyclicity. We used the gap-filled gas flux time series from two consecutive years to evaluate the impact of rewetting on the annual vertical carbon balances of the cutover bog. Rewetting had a considerable effect on the annual carbon fluxes and led to increased CH4 and decreased CO2 release. The larger relative difference between cumulative CO2 fluxes from the rewetted (22&#8201;&#177;&#8201;7&#8201;mol&#8201;m&#8722;2&#8201;a&#8722;1) and drained (13&#8201;&#177;&#8201;6&#8201;mol&#8201;m&#8722;2&#8201;a&#8722;1) section occurred in the second observed year when rewetting apparently reduced CO2 emissions by 40&#8201;%. The absolute difference in annual CH4 flux sums was more similar between both years while the relative difference of CH4 release between the rewetted (0.83&#8201;&#177;&#8201;0.15&#8201;mol&#8201;m&#8722;2&#8201;a&#8722;1) and drained (0.45&#8201;&#177;&#8201;0.11&#8201;mol&#8201;m&#8722;2&#8201;a&#8722;1) section was larger in the first observed year indicating a maximum increase of annual CH4 release of 84&#8201;% caused by rewetting; at this particular site during the study period.

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Photosynthetic performance, height growth, and dominance of naturally regenerated sessile oak (Quercus petraea [Mattuschka] Liebl.) seedlings in small-scale canopy openings of varying sizes

Modrow

Kuehne

Saha³

et al. 2019

Eur J Forest Res

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Photosynthesis capacity of Quercus petraea (Matt.) saplings is affected by Molinia caerulea (L.) under high irradiance

Cited by 11 publications

References 51 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

Comparison of eddy covariance CO<sub>2</sub> and CH<sub>4</sub> fluxes from mined and recently rewetted sections in a NW German cutover bog

Photosynthetic performance, height growth, and dominance of naturally regenerated sessile oak (Quercus petraea [Mattuschka] Liebl.) seedlings in small-scale canopy openings of varying sizes

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Photosynthesis capacity of Quercus petraea (Matt.) saplings is affected by Molinia caerulea (L.) under high irradiance

Cited by 11 publications

References 51 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

Comparison of eddy covariance CO&lt;sub&gt;2&lt;/sub&gt; and CH&lt;sub&gt;4&lt;/sub&gt; fluxes from mined and recently rewetted sections in a NW German cutover bog

Photosynthetic performance, height growth, and dominance of naturally regenerated sessile oak (Quercus petraea [Mattuschka] Liebl.) seedlings in small-scale canopy openings of varying sizes

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Comparison of eddy covariance CO<sub>2</sub> and CH<sub>4</sub> fluxes from mined and recently rewetted sections in a NW German cutover bog