Hofmann, KY; Heuck, C; Spohn, M: Phosphorus resorption by young beech trees and soil phosphatase activity as dependent on P availability, Oecologia, 181, 369-379 (2016), doi:10.1007/s00442-016-3581-x
Motivated by decreasing foliar phosphorus (P) concentrations in Fagus sylvatica L. forests, we studied P recycling depending on P fertilization in mesocosms with juvenile trees and soils of two contrasting F. sylvatica L. forests in a greenhouse. We hypothesized that forests with low soil P availability are better adapted to recycle P than forests with high soil P availability. The P resorption efficiency from senesced leaves was significantly higher at the P-poor site (70 %) than at the P-rich site (48 %). P fertilization decreased the resorption efficiency significantly at the P-poor site to 41 %, while it had no effect at the P-rich site. Both acid and alkaline phosphatase activity were higher in the rhizosphere of the P-poor than of the P-rich site by 53 and 27 %, respectively, while the activities did not differ in the bulk soil. Fertilization decreased acid phosphatase activity significantly at the P-poor site in the rhizosphere, but had no effect on the alkaline, i.e., microbial, phosphatase activity at any site. Acid phosphatase activity in the P-poor soil was highest in the rhizosphere, while in the P-rich soil, it was highest in the bulk soil. We conclude that F. sylvatica resorbed P more efficiently from senescent leaves at low soil P availability than at high P availability and that acid phosphatase activity in the rhizosphere but not in the bulk soil was increased at low P availability. Moreover, we conclude that in the P-rich soil, microbial phosphatases contributed more strongly to total phosphatase activity than plant phosphatases.

Keywords: Forest nutrition, Nutrient resorption, Rhizosphere, Phosphomonoesterase, Plant–microbe interaction

Aktuelle Termine

Do. 12.04.2018
- folgt -
Do. 19.04.2018
A new experiment to unravel the Impact of Biodiversity and Climate Variability on the functioning of grasslands
Do. 26.04.2018
Anticipating biome shifts
Ökologisch-Botanischer Garten:
So. 04.03.2018
Die Lösung? Pflanzliche Alternativen für Plastik
Mi. 28.02.2018
Workshop Einstieg in die Umweltmesstechnik mit Arduino und Raspberry Pi
Wetter Versuchsflächen
Niederschlag: 0.0 mm/24h
Sonnenschein: <1 h/d

Globalstrahlung: 468 W/m²
Lufttemperatur: -5.2 °C
Niederschlag: 0.0 mm/24h
Sonnenschein: 1 h/d
Wind (Höhe 32m): 5.8 km/h
Wind (Max.): 16.6 km/h