Full TGIF Record # 110543
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Web URL(s):https://academic.oup.com/aob/article/92/5/679/241191/
    Last checked: 03/01/2017
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Publication Type:
i
Refereed
Author(s):Lötscher, Markus; Stroh, Katharina; Schnyder, Hans
Author Affiliation:Lehrstuhl für Grünlandlehre, Technische Universität München, Freising, Germany
Title:Vertical leaf nitrogen distribution in relation to nitrogen status in grassland plants
Section:Original articles
Other records with the "Original articles" Section
Source:Annals of Botany. Vol. 92, No. 5, November 2003, p. 679-688.
Publishing Information:London, Oxford University Press
# of Pages:10
Keywords:TIC Keywords: Nitrogen; Leaves; Distribution; Grasslands; Photosynthesis; Nutrient availability; Seeding; Density; Medicago sativa; Dactylis glomerata; Taraxacum officinale
Abstract/Contents:"Vertical gradients of leaf nitrogen (N) per unit leaf area (NLA) are viewed as plastic responses that optimize N utilization with respect to carbon assimilation. However, it has been shown that plant species, sowing density and N availability affect the steepness of the NLA gradient relative to the photon flux density (PFD) gradient. This paper tests the hypothesis that such variation is related to the N status of the plant. The N status was analysed using the concept of the critical N concentration (Ncrit) in which shoot N per unit dry mass (NSM) decreases with shoot mass, and a negative deviation of actual NSM from Ncrit indicates N shortage in the plant. The hypothesis was tested with contrasting grassland species Medicago sativa, Dactylis glomerata and Taraxacum officinale by varying PFD and N availability, plant density and hierarchial positions of individuals within stands. Combinations of all treatments showed a general negative correlation between the N allocation coefficient (i.e. the slope of the NLA-PFD relationship) and NSM for all three species. Thus, NLA, relative to PFD, gradients became steeper with increasing shoot mass and increasing N shortage in the plant. These data are consistent with the view that internal N availability is an important factor in modifying the NLA gradient."
Language:English
References:22
Note:Tables
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ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Lötscher, M., K. Stroh, and H. Schnyder. 2003. Vertical leaf nitrogen distribution in relation to nitrogen status in grassland plants. Ann. Bot. 92(5):p. 679-688.
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https://academic.oup.com/aob/article/92/5/679/241191/
    Last checked: 03/01/2017
    Requires: PDF Reader
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MSU catalog number: QK 1 .A53
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