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Strecker, Tanja; Gonzalez, Odette; Scheu, Stefan; Eisenhauer, Nico (2015): Analysis of spatial microbial properties from experimental plots of the Jena experiment (September 2010). PANGAEA,, In supplement to: Strecker, T et al. (2016): Functional composition of plant communities determines the spatial and temporal stability of soil microbial properties in a long-term plant diversity experiment. Oikos, (accepted),

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The study was carried out on the main plots (Main Experiment) of a large grassland biodiversity experiment, the Jena Experiment. In the main experiment, 82 grassland plots of 20 x 20 m were established from a pool of 60 species belonging to four functional groups (grasses, legumes, tall and small herbs). In May 2002, varying numbers of plant species from this species pool were sown into the plots to create a gradient of plant species richness (1, 2, 4, 8, 16 and 60 species) and functional richness (1, 2, 3, 4 functional groups). Plots were maintained by bi-annual weeding and mowing. This data set consists of standard deviation (SD), mean and stability (stab) of soil microbial basal respiration (µl O2/h/g dry soil) and microbial biomass carbon (µg C/g dry soil). Data were derived by taking soil samples and measuring basal and substrate-induced microbial respiration with an oxygen-consumption apparatus. Samples for calculating the spatial stability of soil microbial properties were taken on the 20th of September in 2010. Oxygen consumption of soil microorganisms in fresh soil equivalent to 3.5 g dry weight was measured at 22°C over a period of 24 h. Basal respiration (µlO2/g dry soil/h) was calculated as mean of the oxygen consumption rates of hours 14 to 24 after the start of measurements. Substrate- induced respiration was determined by adding D-glucose to saturate catabolic enzymes of microorganisms according to preliminary studies (4 mg g-1 dry soil solved in 400 µl deionized water). Maximum initial respiratory response (µl O2/g dry soil/ h) was calculated as mean of the lowest three oxygen consumption values within the first 10 h after glucose addition. Microbial biomass carbon (µg C/g dry soil) was calculated as 38 × Maximum initial respiratory response according to prelimiray studies.
Further details:
Anderson, J P E; Domsch, K H (1978): A physiological method for the quantitative measurement of microbial biomass in soils. Soil Biology and Biochemistry, 10(3), 215-221,
Beck, T; Joergensen, R G; Kandeler, E; Makeschin, F; Nuss, E; Oberholzer, H R; Scheu, Stefan (1997): An inter-laboratory comparison of ten different ways of measuring soil microbial biomass C. Soil Biology and Biochemistry, 29(7), 1023-1032,
Scheu, Stefan (1992): Automated measurement of the respiratory response of soil microcompartments: Active microbial biomass in earthworm faeces. Soil Biology and Biochemistry, 24(11), 1113-1118,
Latitude: 50.946100 * Longitude: 11.611300
Minimum DEPTH, sediment/rock: 0.1 m * Maximum DEPTH, sediment/rock: 0.1 m
Jena_Experiment (Jena Experiment) * Latitude: 50.946100 * Longitude: 11.611300 * Location: Thuringia, Germany * Method/Device: Experiment (EXP)
The spatial soil cores had a diameter from 1,5 cm and were taken up to 10 cm. The soil was sampled in plastic bags, stored at 5 degree C for max. 6 weeks until further measurements.
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Experimental plotExperimental plotdetailed explanations of plots and the plant diversity gradient are provided in the section "further details".
2DEPTH, sediment/rockDepthmStrecker, TanjaGeocode
3ReplicatesRepl#Strecker, Tanjareplicates of microbial repiration and biomass
4Microbial respiration per soil dry massMicrob resp dmµl/h/gStrecker, Tanjaspatial measurement, log-transformed
5Microbial respiration per soil dry mass, standard deviationMicrob resp dm std dev±Strecker, Tanjaspatial measurement, log-transformed
6Spatial stabilitySpatial stabStrecker, TanjaCalculatedof basal respiration, calculated as Mean/SD
7Microbial biomass as carbon per soil dry massMicrob biom C dmµg/gStrecker, Tanjaspatial measurement
8Microbial biomass as carbon per soil dry mass, standard deviationMicrob biom C dm std dev±Strecker, Tanjaspatial measurement
9Spatial stabilitySpatial stabStrecker, TanjaCalculatedof microbial biomass carbon, calculated as Mean/SD
632 data points

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