Abstract
Keywords: ammonium / flooding / gas exchange / nitrate / photosynthesis Abstract • We investigated the effects of flooding for three weeks on physiological responses and uptake of NH + and NO − by black spruce (Picea mariana (Mill.) BSP.) and tamarack (Larix laricina (Du Roi) K. Koch) seedlings fertilized with labeled ( 15 NH4)2SO4 or K 15 NO3 in a growth chamber experiment. • Flooding reduced photosynthesis (A), transpiration (E), water use efficiency (WUE), and current uptake of NH + and NO − in both species. • Under flooding, there were no significant differences between the two species in uptake of either NH + or NO − at the whole-plant level but black spruce had higher translocation of NH + to the shoots
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