Zederer, DP; Talkner, U; Spohn, M; Joergensen, R G: Microbial biomass phosphorus and C/N/P stoichiometry in forest floor and A horizons as affected by tree species, Soil Biology Biochemistry, 111, 166-175 (2017), doi:10.1016/j.soilbio.2017.04.009
Forest floor horizons contain significant total P stocks, but information on the contribution of microbial biomass P (PMB) and on the controlling factors of this pool is limited. Slightly modified fumigation extraction procedures were used to investigate the stoichiometric relationships of PMB to microbial biomass C (CMB) and microbial biomass N (NMB) in the forest floor (L, F, H, and A horizons) at five sites, differing in P availability to trees, under adjacent spruce (Picea abies) and beech (Fagus sylvatica) stands. CMB, NMB, and PMB contents were higher in forest floors under beech than under spruce. Mean stocks of PMB and total P were roughly 27 and 100 kg ha−1 in the forest floor, respectively, but did not differ between the tree species, due to an increased organic matter accumulation in the forest floor under spruce. This reveals the importance of forest floor horizons and microbial biomass turnover for P nutrition of trees in acidic soils with the humus form moder. C/PMB ratios declined from roughly 26 in L to 13 in F and H horizons, followed by an increase to roughly 17 in A horizons. The range of C/PMB ratios was small at all sites in relation to the wide SOC/total P ratios of the litter used as microbial substrate, indicating a relatively strict homeostatic regulation of the forest floor microbial, mainly fungal biomass stoichiometry.
Aktuelle Termine

Mi. 22.11.2017
The Roots of Drought Tolerance
Do. 23.11.2017
Death and deception: The ecology and evolution of carrion flowers
Do. 30.11.2017
Improving land models through the use of surface temperature evaluations
Ökologisch-Botanischer Garten:
So. 03.12.2017
Von Anis bis Zimt: Gewürze im Lebkuchen
Do. 07.12.2017
Ökumenische Andacht zum Advent mit dem Swahili Chor Bayreuth
Wetter Versuchsflächen
Luftdruck (356m): 969.6 hPa
Lufttemperatur: 6.6 °C
Niederschlag: 4.4 mm/24h
Sonnenschein: <1 h/d
Wind (Höhe 17m): 8.2 km/h
Wind (Max.): 19.8 km/h
Windrichtung: SW

Globalstrahlung: 1 W/m²
Lufttemperatur: 3.7 °C
Niederschlag: 9.3 mm/24h
Sonnenschein: <1 h/d
Wind (Höhe 32m): 15.8 km/h
Wind (Max.): 34.2 km/h