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 | Urbina, Ifigenia | Grau, Oriol | Sardans, Jordi | Peguero, Guille | Gargallo-Garriga, Albert | Peñuelas, Josep | Vicca, Sara
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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