| Stadler, J; Gebauer, G: Nitrate reduction and nitrate content in ash trees (Fraxinus excelsior L.): Distribution between compartments, site comparison and seasonal variation, Trees, 6, 236-240 (1992), doi:10.1007/BF00224342 | |
| Abstract: Nitrate reductase activity (NRA), nitrate content and biomass components of leaflets, leaf stalks, old stem, current-year stem and roots of ash trees (Fraxinus excelsior L.) growing in their natural habitats were investigated. In addition, NRA, total nitrogen and nitrate concentration were analyzed in the leaves and roots of ash trees from four different field sites. The highest NRA per gram biomass and also per total compartment biomass was found in the leaflets, even though root biomass was much higher than total leaflet biomass. The highest nitrate concentrations were found in the leaf stalks. Correlations between nitrate availability in the soil and NRA in leaves were not significant due to high variability of the actual soil nitrate concentrations. The seasonal variation in foliar NRA, nitrate concentration and total nitrogen concentration is much smaller in F. excelsior than reported for herbaceous species and is mainly caused by changes in the actual soil nitrate availability and by senescence of the leaves. |
Upcoming ...
Upcoming ...
| BayCEER Colloquium: |
|---|
| Th. 2024-06-06 Tracking plant diversity dynamics on islands over thousands of years |
| Mo. 2024-06-10 Arsenic biogeochemistry from paddy soil to rice grain |
| Ecological-Botanical Garden: |
| Su. 2024-05-19 now Führung | "Den ÖBG Kennenlernen: Allgemeine Gartenführung" |
| We. 2024-05-29 Führung | "Grüne Apotheke: Heilpflanzen" |
| Inaugural Lecture: |
| We. 2024-05-22 Funktionelle Pilzökologie: Diversität und Prozesse auf unterschiedlichen Skalen |