Rapid root assimilation of added phosphorus in a lowland tropical rainforest of French Guiana
Van Langenhove, Leandro | Janssens, Ivan A. | Verryckt, Lore | Brechet, Laetitia | Hartley, Iain P. | Stahl, Clement | Courtois, Elodie | Urbina, Ifigenia | Grau, Oriol | Sardans, Jordi | Peguero, Guille | Gargallo-garriga, Albert | Peñuelas, Josep | Vicca, Sara
Theory states that tree growth in lowland tropical forests on old, weathered soils is limited by low phosphorous (P) availability. However, evidence for P limitation from nutrient manipulation experiments remains unclear, 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 addition. We measured in soils with intact root systems and soils excluding roots and mycorrhizal fungi with 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 where the roots remained undisturbed. N dynamics were unaffected by root presence/absence. These results indicate rapid root uptake of P, but not of N, suggesting very effective P acquisition in these lowland rainforests.
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