Partitioning of remobilised N in young beech (<i>Fagus sylvatica</i> L.) 
is not affected by elevated [CO2]

Dyckmans, Jens; Flessa, Heiner

doi:10.1051/forest:2005021

Cited by 6 publications

(4 citation statements)

References 19 publications

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“…It is now clear from a wide body of literature that the capacity of forests to grow and adsorb extra C in response to increasing atmospheric carbon dioxide concentrations will likely be regulated by ecosystem nutrient cycling, particularly of N (e.g., Johnson 2006). While there are thousands of studies that have quantified changes in the C physiology of trees in response to elevated atmospheric CO 2 (including many reviews), there are only scores that have dealt with forest ecosystem nutrient cycling and only a handful that have addressed N storage and remobilization within the trees themselves, all of these in young seedlings (e.g., Temperton et al 2003, Dyckmans and Flessa 2005, Vizoso et al 2008.…”

Section: Future Researchmentioning

confidence: 99%

Nitrogen storage and remobilization by trees: ecophysiological relevance in a changing world

2010

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The role of carbon (C) and nitrogen (N) storage by trees will be discussed in terms of uncoupling their growth from resource acquisition. There are profound differences between the physiology of C and N storage. C storage acts as a short-term, temporary buffer when photosynthesis cannot meet current sink demand and remobilization is sink driven. However, the majority of C allocated to non-structural carbohydrates such as starch is not reused so is in fact sequestered, not stored. In contrast, N storage is seasonally programmed, closely linked to tree phenology and operates at temporal scales of months to years, with remobilization being source driven. We examine the ecological significance of N storage and remobilization in terms of regulating plant N use efficiency, allowing trees to uncouple seasonal growth from N uptake by roots and allowing recovery from disturbances such as browsing damage. We also briefly consider the importance of N storage and remobilization in regulating how trees will likely respond to rising atmospheric carbon dioxide concentrations. Most studies of N storage and remobilization have been restricted to small trees growing in a controlled environment where (15)N can be used easily as a tracer for mineral N. We highlight the need to describe and quantify these processes for adult trees in situ where most root N uptake occurs via ectomycorrhizal partners, an approach that now appears feasible for deciduous trees through quantification of the flux of remobilized N in their xylem. This opens new possibilities for studying interactions between N and C allocation in trees and associated mycorrhizal partners, which are likely to be crucial in regulating the response of trees to many aspects of global environmental change.

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Section: Future Researchmentioning

confidence: 99%

Nitrogen storage and remobilization by trees: ecophysiological relevance in a changing world

2010

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“…The importance and proportional contributions of NF compared with NP in sinks of new growth has yet to be determined in temperate deciduous forest tree species such as northern red oak (Quercus rubra L.). Additionally, although retranslocation has been studied at the whole plant level, few studies have examined retranslocation response at the leaf level [13,14].…”

Section: Introductionmentioning

confidence: 99%

Growth, physiology, and nutrient retranslocation in nitrogen-15 fertilized Quercus rubra seedlings

et al. 2008

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-We evaluated gas exchange, chlorophyll index (CI) using SPAD-502 chlorophyll meter, and leaf nutritional responses in one-year-old northern red oak (Quercus rubra L.) container seedlings transplanted into control (unfertilized) or fertilized (0.86 g N plant −1 ) sand culture and grown in a greenhouse for 90 days. We labeled current nitrogen (N) uptake with ( 15 NH 4 ) 2 SO 4 and directly quantified proportional contributions of N derived from fertilizer (NF) compared with retranslocation or N derived from plant (NP) in leaf growth of red oak seedlings. NF met a greater N demand in leaf growth of fertilized plants while unfertilized seedlings relied entirely on NP for their leaf growth. Fertilization increased leaf dry mass by 67% and new stem dry mass by 253% 90 days after transplanting compared to control seedlings. Specific leaf area (SLA) was not significantly altered but CI increased 90 days after transplanting. Higher leaf N concentration and content in fertilized compared with control seedlings was linked to greater chlorophyll concentrations in the former plants. The higher coefficient of determination (r 2 = 0.72) noted between leaf N concentrations and CI suggests that the SPAD meter could be a useful tool for assessing leaf N status in northern red oak seedlings. Fertilized seedlings exhibited higher net assimilation, stomatal conductance, and transpiration rates compared with controls. Increased seedling growth in response to fertilization was related to maintenance of higher gas exchange and greater nutrient uptake, which could improve outplanting success. fertilization / gas exchange / northern red oak / nitrogen / photosynthesis / retranslocation / SPAD meter Résumé -Croissance, échanges gazeux et réponses nutritionnelles de jeunes semis de Quercus rubra soumis à une fertilisation par ( 15 NH 4 ) 2 SO 4 . Nous avons estimé les échanges gazeux foliaires, un index de teneurs en chlorophylles (IC) avec un chlorophylle-mètre SPAD-502 et les teneurs en nutriments dans les feuilles de jeunes plants de chêne rouge d'Amérique (Quercus rubra L.) âgés d'un an. Les plants ont été transplantés dans du substrat sableux non fertilisé (témoins) ou fertilisé avec 0.86 g N par plante, et cultivés pendant 90 jours sous serre. L'azote apporté par la fertilisation était marqué avec ( 15 NH 4 ) 2 SO 4 et nous avons directement quantifié les contributions à la croissance foliaire de N apporté par la fertilisation (NF) par rapport à celle de N remobilisé depuis les pools de réserve de la plante (NP). NF constituait la fraction la plus importante d'azote foliaire de plants fertilisés, alors que l'azote foliaire des plants non fertilisés était exclusivement constitué de NP. La fertilisation s'est traduite par une augmentation, par rapport aux plantes témoins, de 67 % de la biomasse foliaire et de 253 % de la biomasse de tiges nouvellement formées 90 jours après la transplantation. La surface spécifique des feuilles n'était pas affectée par la fertilisation alors que CI avait significativement augmenté. Des teneur...

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“…The longterm impacts of CO 2 enrichment on the assimilation of C in leaves may depend on the environment's capacity to provide adequate N and the capacity of plants to use the N reserves or to regulate the growth of sink organs (Aranjuelo et al 2009;Aranjuelo et al 2011a). If sufficient N is present, elevated levels of CO 2 can influence the capacity of plants to form N reserves (Dyckmans and Flessa 2005;Vanuytrecht et al 2011). Under N deficiency conditions, an increased productivity and a corresponding increase in the demand of N in CO 2 -enriched conditions are predicted to exacerbate any existing N limitation within an ecosystem and eventually limit the productivity (Luo et al 2004;Norby and Iversen 2006).…”

Section: Introductionmentioning

confidence: 99%

Increased sink capacity enhances C and N assimilation under drought and elevated CO2 conditions in maize

Zong

2016

Journal of Integrative Agriculture

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The maintenance of rapid growth under conditions of CO 2 enrichment is directly related to the capacity of new leaves to use or store the additional assimilated carbon (C) and nitrogen (N). Under drought conditions, however, less is known about C and N transport in C 4 plants and the contributions of these processes to new foliar growth. We measured the patterns of C and N accumulation in maize (Zea mays L.) seedlings using 13 C and 15 N as tracers in CO 2 climate chambers (380 or 750 µmol mol-1) under a mild drought stress induced with 10% PEG-6000. The drought stress under ambient conditions decreased the biomass production of the maize plants; however, this effect was reduced under elevated CO 2. Compared with the water-stressed maize plants under atmospheric CO 2 , the treatment that combined elevated CO 2 with water stress increased the accumulation of biomass, partitioned more C and N to new leaves as well as enhanced the carbon resource in ageing leaves and the carbon pool in new leaves. However, the C counterflow capability of the roots decreased. The elevated CO 2 increased the time needed for newly acquired N to be present in the roots and increased the proportion of new N in the leaves. The maize plants supported the development of new leaves at elevated CO 2 by altering the transport and remobilization of C and N. Under drought conditions, the increased activity of new leaves in relation to the storage of C and N sustained the enhanced growth of these plants under elevated CO 2 .

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Partitioning of remobilised N in young beech (Fagus sylvatica L.) is not affected by elevated [CO2]

Cited by 6 publications

References 19 publications

Nitrogen storage and remobilization by trees: ecophysiological relevance in a changing world

Nitrogen storage and remobilization by trees: ecophysiological relevance in a changing world

Growth, physiology, and nutrient retranslocation in nitrogen-15 fertilized Quercus rubra seedlings

Increased sink capacity enhances C and N assimilation under drought and elevated CO2 conditions in maize

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