Bachmann, Dörte; Guderle, Marcus; Roscher, Christiane; Milcu, Alexandru; Buchmann, Nina; Roy, Jacques (2017): Stomatal conductance, leaf greenness, and height of species in the Jena-Ecotron experiment. PANGAEA, https://doi.org/10.1594/PANGAEA.877650, In supplement to: Guderle, Marcus; Bachmann, Dörte; Milcu, Alexandru; Gockele, Annette; Bechmann, Marcel; Fischer, Christine; Roscher, Christiane; Landais, Damien; Ravel, Olivier; Devidal, Sébastien; Roy, Jacques; Gessler, Arthur; Buchmann, Nina; Weigelt, Alexandra; Hildebrandt, Anke (2017): Dynamic niche partitioning in root water uptake facilitates efficient water use in more diverse grassland plant communities. Functional Ecology, https://doi.org/10.1111/1365-2435.12948
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This dataset contains stomatal conductance, leaf greenness, and height of species in the Jena-Ecotron Experiment in 2012. This experiment was conducted in the Montpellier European Ecotron (CNRS, France), an advanced controlled environment facility for ecosystem research, and aimed at understanding the impact of plant species richness (4 vs. 16 species) for ecosystem carbon and water fluxes.
The soil monoliths used in this experiment contained plant communities originating from the long- term Jena Experiment (50°57.1' N, 11°37.5' E, 130 m above sea level; mean annual temperature 9.3°C, mean annual precipitation 587 mm) established in May 2002. Twelve plots were selected for the Jena-Ecotron study according to the following criteria: (1) the four functional groups grasses, legumes, small and tall herbs were present, (2) realized species numbers were close to sown species richness, and (3) plots were equally distributed across the experimental field site to account for different soil textures. Large monoliths (2 m² surface area, diameter of 1.6 m, 2 m depth with a weight of 7 to 8 tons) including intact soil and vegetation were excavated in December 2011 and placed in lysimeters. In March 2012, before the start of the vegetation growth, the lysimeters were transported and installed in the Macrocosms platform of the Montpellier European Ecotron.
Stomatal conductance (gs, mmol/m²/s) was measured with a portable leaf porometer (SC-1 Leaf porometer, Decagon Devices, Pullman, USA). Measurements were done in the auto mode using the first 30 s of stomatal conductance data to predict the final stomatal conductance under true steady state conditions. Leaf greenness (SPAD; unitless), an estimate of chlorophyll concentrations, was obtained by measuring the absorption of two different wavelength (650 nm and 940 nm) with a portable chlorophyll meter (SPAD-502; Konica-Minolta, Osaka, Japan). The growth height of three shoots (Ind h; cm) per species and unit was measured with a ruler. Values of stomatal conductance, leaf greenness and growth height of the individual measurements were averaged per species per plot.
Milcu, Alexandru; Eugster, Werner; Bachmann, Dörte; Guderle, Marcus; Roscher, Christiane; Gockele, Annette; Landais, Damien; Ravel, Olivier; Gessler, Arthur; Lange, Markus; Ebeling, Anne; Weisser, Wolfgang W; Roy, Jacques; Hildebrandt, Anke; Buchmann, Nina (2016): Plant functional diversity increases grassland productivity-related water vapor fluxes: an Ecotron and modeling approach. Ecology, 97(8), 2044-2054, https://doi.org/10.1890/15-1110.1
Milcu, Alexandru; Roscher, Christiane; Gessler, Arthur; Bachmann, Dörte; Gockele, Annette; Guderle, Marcus; Landais, Damien; Piel, Clement; Escpape, Christophe; Devidal, Sébastien; Ravel, Olivier; Buchmann, Nina; Gleixner, Gerd; Hildebrandt, Anke; Roy, Jacques (2014): Functional diversity of leaf nitrogen concentrations drives grassland carbon fluxes. Ecology Letters, 17(4), 435-444, https://doi.org/10.1111/ele.12243
Latitude: 50.946100 * Longitude: 11.611300
Date/Time Start: 2012-07-17T00:00:00 * Date/Time End: 2012-07-19T17:00:00
Minimum HEIGHT above ground: 0.5 m * Maximum HEIGHT above ground: 0.5 m
There are two types of missing values contained in datasets from the Jena Experiment. Empty cells represent missing values that result from the design of the experiment. Empty cells result when the respective value does not occur in the design and could thus not be measured. For example, in the case of species-specific biomass cells are left blank, when the species was not sown in the respective plot. Missing values that resulted from methodological problems, sampling errors, or lost samples/data are marked with "-9999".
This dataset is part of a collection of measurements of the Jena-Ecotron Experiment, which was part of the Jena Experiment.
|#||Name||Short Name||Unit||Principal Investigator||Method/Device||Comment|
|1||Experimental plot||Experimental plot||Guderle, Marcus||Detailed explanations of plots and the plant diversity gradient are provided in the section further details.|
|2||Height aboveground, minimum||Height min||m||Guderle, Marcus||Soil surface|
|3||Height aboveground, maximum||Height max||m||Guderle, Marcus||rough approximation of max plant height|
|4||HEIGHT above ground||Height||m||Guderle, Marcus||Geocode – Average of min and max value|
|5||Date/time start||Date/time start||Guderle, Marcus||of sampling campaign|
|6||Date/time end||Date/time end||Guderle, Marcus||of sampling campaign|
|7||Treatment: mowing||Treat mow||Guderle, Marcus||Speciefies if multiple samples per plot have been taken and are provided in the data file.|
|8||Treatment: weeding||Treat weed||Guderle, Marcus||Speciefies if multiple samples per plot have been taken and are provided in the data file.|
|9||Treatment: weeding history||Treat weed hist||Guderle, Marcus||Detailed explanations of plots and the plant diversity gradient are provided in the section further details.|
|10||Treatment: seed addition||Treat seed add||Guderle, Marcus||Detailed explanations of plots and the plant diversity gradient are provided in the section further details.|
|11||Treatment: fertilizing||Treat fert||Guderle, Marcus|
|12||Treatment: drought||Treat drought||Guderle, Marcus|
|13||Treatment: aboveground: pesticide||Treat abovegr pest||Guderle, Marcus|
|14||Treatment: below pesticide||Treat below pest||Guderle, Marcus|
|15||Treatment: molluscide||Treat mollus||Guderle, Marcus|
|16||Treatment: nematicide||Treat nema||Guderle, Marcus|
|17||Treatment: eartworm exclosure||Treat eartworm excl||Guderle, Marcus|
|18||Treatment: phytometers||Treat phyto||Guderle, Marcus|
|19||Treatment: special||Treat special||Guderle, Marcus|
|20||DATE/TIME||Date/Time||Guderle, Marcus||Geocode – Date and time of measurement|
|22||Stomatal conductance||Stom conductance||mmol/m2/s||Guderle, Marcus||Measured on species level|
|23||Leaf greenness, chlorophyll concentration||SPAD||Guderle, Marcus||Measured on species level|
|24||Leaf height||Leaf h||cm||Guderle, Marcus||Measured on species level|
|25||Individual height||Ind h||cm||Guderle, Marcus||Measured on species level|
7476 data points