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

Type Article
Date 2020-01
Language English
Author(s) Van Langenhove Leandro1, Janssens Ivan A.1, Verryckt Lore1, Brechet Laetitia1, Hartley Iain P.2, Stahl Clement3, Courtois Elodie4, Urbina Ifigenia5, 6, Grau Oriol5, 6, 7, Sardans Jordi5, 6, Peguero Guille1, Gargallo-Garriga Albert5, 6, 8, Peñuelas Josep5, 6, Vicca Sara1
Affiliation(s) 1 : Centre of Excellence PLECO (Plants and Ecosystems), Department of Biology, University of Antwerp, Wilrijk, Belgium
2 : Department of Geography, University of Exeter, RennesDrive, Exeter, Devon, EX4 4RJ, United Kingdom
3 : INRA, UMR EcoFoG, CNRS, Cirad, AgroParisTech, Université des Antilles, Université de Guyane, Kourou, France
4 : Laboratoire écologie, évolution, Interactions des Systèmes Amazoniens (LEEISA), Université de Guyane, CNRS, IFREMER, Cayenne, France
5 : CSIC, Global Ecology Unit CREAF-CSIC-UAB, Cerdanyola del Vallès, Catalonia, 08193, Spain
6 : CREAF, Cerdanyola del Vallès, Catalonia, 08193, Spain
7 : Cirad, UMR EcoFoG (AgroParisTech, CNRS, Inra, Univ Antilles, Univ Guyane), Campus Agronomique, 97310, Kourou, French Guiana
8 : Global Change Research Institute, Czech Academy of Sciences, Czech Republic
Source Soil Biology & Biochemistry (0038-0717) (Elsevier BV), 2020-01 , Vol. 140 , P. 107646 (3p.)
DOI 10.1016/j.soilbio.2019.107646
WOS© Times Cited 1
Keyword(s) Tropical forest, Phosphorus, Nitrogen, Fertilization, Root system, Plant root simulator probes
Abstract

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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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 (2020). Rapid root assimilation of added phosphorus in a lowland tropical rainforest of French Guiana. Soil Biology & Biochemistry, 140, 107646 (3p.). Publisher's official version : https://doi.org/10.1016/j.soilbio.2019.107646 , Open Access version : https://archimer.ifremer.fr/doc/00589/70161/