In situ fate of mineral N in the tree-soil-microorganism system before and after budburst in 20-year-old Quercus petraea (Matt.) Liebl.
MAXWELL, Tania
Ecologie Systématique et Evolution [ESE]
Interactions Sol Plante Atmosphère [UMR ISPA]
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Ecologie Systématique et Evolution [ESE]
Interactions Sol Plante Atmosphère [UMR ISPA]
MAXWELL, Tania
Ecologie Systématique et Evolution [ESE]
Interactions Sol Plante Atmosphère [UMR ISPA]
< Leer menos
Ecologie Systématique et Evolution [ESE]
Interactions Sol Plante Atmosphère [UMR ISPA]
Idioma
en
Article de revue
Este ítem está publicado en
Plant and Soil. 2020p. 1-14
Springer Verlag
Fecha de defensa
2020Resumen en inglés
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 ...Leer más >
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.< Leer menos
Palabras clave en inglés
Nitrogen uptake
Soil N
Microorganisms
Broadleaf tree
N-15 labeling
Orígen
Importado de HalCentros de investigación