In situ fate of mineral N in the tree-soil-microorganism system before and after budburst in 20-year-old Quercus petraea (Matt.) Liebl
| Autor: | Gaëlle Vincent, Liliana Pinek, Baptiste Laffont, Laure Barthes, Tania L. Maxwell, Stéphane Bazot, Anne Marmagne |
|---|---|
| Přispěvatelé: | Ecologie Systématique et Evolution (ESE), AgroParisTech-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Interactions Sol Plante Atmosphère (UMR ISPA), Ecole Nationale Supérieure des Sciences Agronomiques de Bordeaux-Aquitaine (Bordeaux Sciences Agro)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Institut Jean-Pierre Bourgin (IJPB), AgroParisTech-Université Paris-Saclay-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) |
| Rok vydání: | 2020 |
| Předmět: |
0106 biological sciences
media_common.quotation_subject Microorganism Microorganisms Soil Science chemistry.chemical_element Biomass Plant Science 01 natural sciences Competition (biology) Soil N media_common 2. Zero hunger biology Chemistry N-15 labeling food and beverages Plant physiology Xylem 04 agricultural and veterinary sciences 15. Life on land biology.organism_classification Nitrogen Horticulture Broadleaf tree [SDE]Environmental Sciences 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Quercus petraea Phloem Nitrogen uptake 010606 plant biology & botany |
| Zdroj: | Plant and Soil Plant and Soil, Springer Verlag, In press, pp.1-14. ⟨10.1007/s11104-020-04610-4⟩ |
| ISSN: | 1573-5036 0032-079X |
| Popis: | Aims: We simultaneously quantified the fate of soil absorbed mineral nitrogen in different tree compartments along with nitrogen immobilization by microorganisms during spring in 20-year-old oak trees. Methods: A soil-applied(15)N solution was traced in situ into the fine roots, medium roots, xylem, phloem, branches, leaves, extractable soil, and microbial biomass before and after budburst, until LAI maximum was reached. Results: During the three weeks following the labeling, around half of the(15)N applied was incorporated into the microbial biomass while the leafless trees absorbed less than 10% of the(15)N. Before and after budburst, the microbial compartment was the main pool of(15)N, and yet the soil-absorbed(15)N still significantly contributed to the leaf nitrogen pool at budburst. This contribution in leaves sharply increased in the days following budburst. Conclusion: The potential competition for mineral nitrogen between trees and the soil microbial biomass is strong during spring. The dependence of the leaf nitrogen pool to internal or external stocks of nitrogen at budburst could be conditioned by environmental conditions. |
| Databáze: | OpenAIRE |
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