1. Rainfall reduction impacts rhizosphere biogeochemistry in eucalypts grown in a deep Ferralsol in Brazil
- Author
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Iraê Amaral Guerrini, Jean-Pierre Bouillet, Jean-Paul Laclau, José Leonardo de Moraes Gonçalves, Christophe Jourdan, Céline Pradier, Verónica Asensio, Philippe Hinsinger, Cassio Hamilton Abreu-Junior, Ecologie fonctionnelle et biogéochimie des sols et des agro-écosystèmes (UMR Eco&Sols), Institut National de la Recherche Agronomique (INRA)-Institut de Recherche pour le Développement (IRD)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Faculdade de Ciências Agronômicas, Universidade Estadual Paulista Júlio de Mesquita Filho [São José do Rio Preto] (UNESP), Escola Superior de Agricultura 'Luiz de Queiroz', Departamento de Ciências Florestais, University of São Paulo, Escola Superior de Agricultura 'Luiz de Queiroz', Centro de Energia Nuclear na Agricultura, MACACC project ANR-13-AGRO-0005, AGROBIOSPHERE 2013 program, USP-COFECUB (Project 2011–25), FAPESP (grant number 2013/25998-4), AGREENIUM (Plantrotem project), Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA), Universidade Estadual Paulista Júlio de Mesquita Filho = São Paulo State University (UNESP), ANR-13-AGRO-0005,MACACC,Modélisation pour l'accompagnement des ACteurs, vers l'Adaptation des Couverts pérennes ou agroforestiers aux Changements globaux(2013), UMR Eco&Sols, Universidade Estadual Paulista (Unesp), and ESALQ
- Subjects
0106 biological sciences ,adaptation aux changements climatiques ,F62 - Physiologie végétale - Croissance et développement ,Plant Science ,Root system ,01 natural sciences ,Nutrient ,[SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry ,pluviométrie ,Transport des substances nutritives ,2. Zero hunger ,Rhizosphere ,système racinaire ,pH ,04 agricultural and veterinary sciences ,6. Clean water ,rainfall rate recording ,Soil horizon ,Fine root ,rhizosphère ,Eucalyptus grandis ,P40 - Météorologie et climatologie ,profondeur ,Bulk soil ,Soil Science ,Context (language use) ,Exchangeable potassium cation ,Biology ,Acidification ,Sécheresse ,profoundness ,ion potassium ,[SDV.BV]Life Sciences [q-bio]/Vegetal Biology ,Changement climatique ,Topsoil ,eucalyptus grandis ,root systems ,Biogeochemistry ,15. Life on land ,K10 - Production forestière ,F61 - Physiologie végétale - Nutrition ,Agronomy ,Soil depth ,13. Climate action ,Potassium ,040103 agronomy & agriculture ,0401 agriculture, forestry, and fisheries ,010606 plant biology & botany - Abstract
Made available in DSpace on 2018-12-11T17:30:25Z (GMT). No. of bitstreams: 0 Previous issue date: 2017-05-01 Agence Nationale de la Recherche Centre de Coopération Internationale en Recherche Agronomique pour le Développement Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Universidade de São Paulo Background and aims: Comparing root functioning under contrasting rainfall regimes can help assessing the capacity of plant species to cope with more intense and frequent drought predicted under climate change context. While the awareness of the need to study the whole root system is growing, most of the studies of root functioning through rhizosphere analyses have been restricted to the topsoil. Our study aimed to assess whether the depth in the soil and the rainfall amount affect root functioning, and notably the fate of nutrients within the rhizosphere. Methods: We compared pH and nutrient availability within the rhizosphere and bulk soil along a 4-m deep soil profile in a 5-year-old eucalypt (Eucalyptus grandis) plantation under undisturbed and reduced rainfall treatments. Results: The exchangeable K concentration and the pH of the bulk soil were not influenced by the reduced rainfall treatment. By contrast, the H3O+ concentration in the rhizosphere was significantly greater than that of the bulk soil, only in the reduced rainfall plot. The concentrations of exchangeable K in the rhizosphere were significantly larger than those of the bulk soil in both treatments but this difference was higher in the reduced rainfall plot, notably below the depth of 2 m. Both exchangeable K and H3O+ concentration significantly increased within the rhizosphere in the reduced rainfall treatment at soil depth down to 4 m. Conclusions: The amount of K brought to the roots by mass flow was estimated and could not explain the observed increase in exchangeable K concentration within the rhizosphere. A more likely explanation was root-induced weathering of K-bearing minerals, partly related to enhanced rhizosphere acidification. Our results demonstrate that root functioning can be considerably altered as a response to drought down to large depths. CIRAD UMR Eco&Sols, 2 Place Viala INRA UMR Eco&Sols, 2 Place Viala FCA UNESP LCF ESALQ CENA ESALQ FCA UNESP Agence Nationale de la Recherche: ANR-13-AGRO-0005 FAPESP: 2013/25998-4
- Published
- 2016
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