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Permanent link (DOI): https://doi.org/10.7939/R30863784

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Current uptake of 15N –labeled ammonium and nitrate in flooded and non-flooded black spruce and tamarack seedlings. Open Access

Descriptions

Author or creator
Islam, M. Anisul
Macdonald, S. Ellen
Additional contributors
Subject/Keyword
photosynthesis
ammonium
gas exchange
flooding
nitrate
Type of item
Journal Article (Published)
Language
English
Place
Time
Description
We investigated the effects of flooding for three weeks on physiological responses and uptake of NH4+ and NO3- by black spruce (Picea mariana (Mill.) BSP.) and tamarack (Larix laricina (Du Roi) K. Koch) seedlings fertilized with labeled (15NH4)2SO4 or K15NO3 in a growth chamber experiment. Flooding reduced photosynthesis (A), transpiration (E), water use efficiency (WUE), and current uptake of NH4+ and NO3- in both species. Under flooding, there were no significant differences between the two species in uptake of either NH4+ or NO3- at the whole-plant level but black spruce had higher translocation of NH4+ to the shoots than did tamarack. Under non-flooded conditions, black spruce seedlings exhibited higher uptake of both NH4+ and NO3- than did tamarack and demonstrated preferential uptake of NH4+ (19. 7 mg g-1dw) over NO3- (12.3 mg g-1dw after three weeks). In contrast, non-flooded tamarack seedlings had equal uptake of NH4+ (4.96 mg g-1dw) and NO3- (4.97 mg g-1dw). We hypothesize that the ability of tamarack to equally exploit both 15NH4+ and 15NO3- would confer an advantage over black spruce, when faced with limitations in the availability of different forms of soil nitrogen.
Date created
2009
DOI
doi:10.7939/R30863784
License information
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© 2009 Annals of Forest Science. This version of this article is open access and can be downloaded and shared. The original author(s) and source must be cited.
Citation for previous publication
Islam, M.A. and S.E. Macdonald. 2009. Current uptake of 15N –labeled ammonium and nitrate in flooded and non-flooded black spruce and tamarack seedlings. Annals of Forest Science 66(1): 102 (11 pages) [DOI: 10.1051/forest:200807]
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