|Zang, U; Goisser, M; Häberle, KH; Matyssek, R; Matzner, E; Borken, W: Effects of drought stress on photosynthesis, rhizosphere respiration and fine root characteristics of beech sapling: A rhizotron field study, Journal of Plant Nutrition and Soil Science, 177, 168-177 (2014), doi:10.1002/jpln.201300196|
Soil drought influences the carbon turnover as well as the fine root system of tree saplings. Particularly during the period of establishment, the susceptibility to drought stress of saplings is increased because of incompletely developed root systems and reduced access to soil water. Here, we subjected beech saplings (Fagus sylvatica L.) to different levels of drought stress. Beech saplings were planted in rhizotrons, which were installed in the soil of a Norway spruce forest before bud burst. Soil moisture was manipulated in the following year during May to September. We measured photosynthetic net CO2 uptake, volume production of fine roots and rhizosphere respiration during the growing season. Biometric parameters of the fine root system, biomass and non-structural carbohydrates were analyzed upon harvest in October. Photosynthesis and rhizosphere respiration decreased with increasing drought stress dose (cumulated soil water potential) and cumulative rhizosphere respiration was significantly negatively correlated with drought stress dose. Fine root length and volume production were highest at moderate soil drought, but decreased at severe soil drought. The proportion of very fine roots < 0.2 mm and the root/shoot-ratio increased whereas the live/dead-ratio of fine roots decreased with increasing drought stress dose.
We conclude that the belowground C allocation as well as the relative water uptake efficiency of beech saplings is increased under drought.
|Fr. 10.07.2020 aktuell|
12th BayCEER Workshop 2020: "Call for Abstracts" geöffnet
Extreme redox oscillations in freshwater re-flooded acid sulfate soil wetlands: Effects on Fe, S, and trace metals geochemical behavior
Dissolved organic matter quality in differently managed forest ecosystems
Signaling of rhizosphere microbiome: key for plant health, development and nutrition
Neuer Termin: BayCEER Workshop 2020
Why Science Communication?
Stoichiometric controls of C and N cycling
Flying halfway across the globe to dig in the dirt – a research stay in Bloomington, USA
Picky carnivorous plants?