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Rapid root assimilation of added phosphorus in a lowland tropical rainforest of French Guiana

Abstract : 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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https://hal.inrae.fr/hal-03198465
Contributor : Marie-Laure Abinne <>
Submitted on : Wednesday, April 14, 2021 - 7:48:27 PM
Last modification on : Tuesday, June 15, 2021 - 2:57:36 PM

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Leandro van Langenhove, Ivan Janssens, Lore Verryckt, Laetitia Brechet, Iain Hartley, et al.. Rapid root assimilation of added phosphorus in a lowland tropical rainforest of French Guiana. Soil Biology and Biochemistry, Elsevier, 2020, 140, pp.107646. ⟨10.1016/j.soilbio.2019.107646⟩. ⟨hal-03198465⟩

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