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Nitrogen resorption from senescing leaves of three salt marsh plant species

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Abstract

Seasonalvariation in leaf nitrogen of mature green and senescent leaves and nitrogenresorption efficiency in three plants (Spartina maritima, Halimioneportulacoides and Arthrocnemum perenne) of aTagus estuary salt marsh are reported. Total nitrogen concentrations in greenand senescent leaves were higher during winter (December and March). Soilinorganic nitrogen availability showed an opposite pattern with higherconcentrations during summer (June and September) when total leaf biomass washigher. Nitrogen resorption efficiency ranged between 31 and 76% andH. portulacoides was the plant that better minimizednitrogen loss by this process. Nitrogen resorption occurred mainly from thesoluble protein pool, although other fractions must have been broken down duringthe resorption process. No significant seasonal variation in nitrogen resorptionefficiency and no relation to leaf total nitrogen or soil nitrogen availabilitywere found. This suggests that the efficiency of the resorption process is notdetermined by the plant nitrogen status nor by the availability of the nutrientin the soil. Nevertheless, resorption from senescing leaves may play animportant role in the nitrogen dynamics of salt marsh plants and reduce thenitrogen requirements for plant growth.

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Cartaxana, P., Catarino, F. Nitrogen resorption from senescing leaves of three salt marsh plant species. Plant Ecology 159, 95–102 (2002). https://doi.org/10.1023/A:1015595430010

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