High foliar K and P resorption efficiencies in old-growth tropical forests growing on nutrient-poor soils.

Urbina, Ifigenia and Grau, Oriol and Sardans, Jordi and Margalef, Olga and Peguero, Guillermo and Asensio, Dolores and Llusià, Joan and Ogaya, Roma and Gargallo-Garriga, Albert and Van Langenhove, Leandro and Verryckt, Lore T. and Courtois, Elodie A. and Stahl, Clement and Soong, Jennifer L. and Chave, Jerome and Hérault, Bruno and Janssens, Ivan A. and Sayer, Emma and Penuelas, Josep (2021) High foliar K and P resorption efficiencies in old-growth tropical forests growing on nutrient-poor soils. Ecology and Evolution, 11 (13). pp. 8969-8982. ISSN 2045-7758

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Resorption is the active withdrawal of nutrients before leaf abscission. This mechanism represents an important strategy to maintain efficient nutrient cycling; however, resorption is poorly characterized in old-growth tropical forests growing in nutrient-poor soils. We investigated nutrient resorption from leaves in 39 tree species in two tropical forests on the Guiana Shield, French Guiana, to investigate whether resorption efficiencies varied with soil nutrient, seasonality, and species traits. The stocks of P in leaves, litter, and soil were low at both sites, indicating potential P limitation of the forests. Accordingly, mean resorption efficiencies were higher for P (35.9%) and potassium (K; 44.6%) than for nitrogen (N; 10.3%). K resorption was higher in the wet (70.2%) than in the dry (41.7%) season. P resorption increased slightly with decreasing total soil P; and N and P resorptions were positively related to their foliar concentrations. We conclude that nutrient resorption is a key plant nutrition strategy in these old-growth tropical forests, that trees with high foliar nutrient concentration reabsorb more nutrient, and that nutrients resorption in leaves, except P, are quite decoupled from nutrients in the soil. Seasonality and biochemical limitation played a role in the resorption of nutrients in leaves, but species-specific requirements obscured general tendencies at stand and ecosystem level.

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Journal Article
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Ecology and Evolution
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14 Jun 2021 11:15
Last Modified:
20 Sep 2023 01:43