Rapid root assimilation of added phosphorus in a lowland tropical rainforest of French Guiana
van Langenhove, Leandro | Janssens, Ivan | Verryckt, Lore | Brechet, Laetitia | Hartley, Iain | Stahl, Clement | Courtois, Elodie, A | Urbina, Ifigenia | Grau, Oriol | Sardans, Jordi | Peguero, Guille | Gargallo-Garriga, Albert | Peñuelas, Josep | Vicca, Sara | Ecologie des forêts de Guyane (UMR ECOFOG) ; Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-AgroParisTech-Université de Guyane (UG)-Centre National de la Recherche Scientifique (CNRS)-Université des Antilles (UA)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) | Elsevier | ANR-11-INBS-0001,ANAEE-FR,ANAEE-Services(2011)
International audience
Показать больше [+] Меньше [-]Английский. Tree growth on weathered soils in lowland tropical forests is limited by low phosphorous (P) availability. However, nutrient manupulation experiments do not always increase the P content in these trees, which raises the question whether trees are taking up added P. In French Guianese lowland rainforest, we measured changes in nitrogen (N) and P availability before and up to two months after N and P fertilizer addition, in soils with intact root systems and in soils where roots and mycorrhizal fungi were excluded by root exclusion cylinders. When the root system was excluded, P addition increased P availability to a much greater extent and for a longer time than in soils with an intact root system. Soil N dynamics were unaffected by root presence/absence. These results indicate rapid P uptake, but not N uptake, by tree roots, suggesting a very effective P acquisition process in these lowland rainforests.
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