Citation:

PANGAEA.880330

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Abstract:

This data set contains measurements of standing belowground plant biomass. Data presented here is from the Main Experiment plots of a large grassland biodiversity experiment (the Jena Experiment; see further details below). 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 in general by bi-annual weeding and mowing. Since 2010, plots were weeded three times per year.

In 2008, standing root biomass was sampled in June. Three soil cores with a 4.8 cm diameter per plot were taken to 30 cm depth and pooled plot-wise. The cores were immediately stored cool until further handling. The bulk material of the pooled cores was weighed and cut with scissors to < 1 cm pieces. For root washing, a 210 g subsample was soaked in water and then repeatedly rinsed with tap water over a 0.5 mm sieve. Remaining soil particles were removed by hand. Roots were dried at 60 - 70 °C and weighed subsequently. In 2008, soil cores were separated in depth increments of 0-5, 5-10, 10-20 and 20-30 cm depth and the corresponding layers were pooled plot-wise. Roots were seperated in coarse (diameter > 2 mm) and fine roots before cutting the bulk material.

Related to:

Ravenek, Janneke; Bessler, Holger; Engels, Christof; Scherer-Lorenzen, Michael; Gessler, Arthur; Gockele, Annette; De Luca, Enrica; Temperton, Vicky; Ebeling, Anne; Roscher, Christiane; Schmid, Bernhard; Weisser, Wolfgang W; Wirth, Christian; de Kroon, Hans; Weigelt, Alexandra; Mommer, Liesje (2014): Long-term study of root biomass in a biodiversity experiment reveals shifts in diversity effects over time. Oikos, 123(12), 1528-1536, https://doi.org/10.1111/oik.01502

Further details:

Plot information of the Jena Main Experiment

Treatment description

Project(s):

The Jena Experiment (JenExp)

Coverage:

Latitude: 50.946100 * Longitude: 11.611300

Date/Time Start: 2008-01-01T00:00:00 * Date/Time End: 2008-12-31T00:00:00

Minimum DEPTH, soil: 0.025 m * Maximum DEPTH, soil: 0.250 m

Event(s):

JenExp_2008 (Jena Experiment 2008) * Latitude: 50.946100 * Longitude: 11.611300 * Date/Time Start: 2008-01-01T00:00:00 * Date/Time End: 2008-12-31T00:00:00 * Location: Thuringia, Germany * Method/Device: Experiment (EXP)

Comment:

The Main experiment on the field site of the Jena Experiment comprises a split-plot design in which additional treatments (e.g. no weeding allowing for invasion of other species, or application of fertilizer) have been applied to subplots along the outer margin of the plots (see Treatment description in the section "further details"). While in this dataset only data from the core area (mown and weeding of all none-sown species twice a year, no additional treatments) is reported, all potential treatments are listed as the first parameters in the data file to guarantee compatibility with other datasets that include different treatments.

There are two types of missing values contained in the dataset. Empty cells represent missing values that result from the design of the experiment when the respective value does not occur and could thus not be measured. For example, in the columns of species-specific biomass cells are left blank, when the species was not sown into 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 belowground plant biomass and morphological root parameters in the Jena Experiment. Similar data from other experiments (e.g. Main Experiment, Dominance Experiment; see details above), other years, or other methods quantifying related data might be available (https://doi.pangaea.de/10.1594/PANGAEA.880330).

Parameter(s):

#	Name	Short Name	Unit	Comment
1	Experimental plot	Experimental plot		Detailed explanations of plots and the plant diversity gradient are provided in the section further details.
2	Depth, soil, minimum	Depth soil min	m
3	Depth, soil, maximum	Depth soil max	m
4	DEPTH, soil	Depth soil	m	Geocode
5	Date/time start	Date/time start		of sampling campaign
6	Date/time end	Date/time end		of sampling campaign
7	Treatment: mowing	T:mow		Detailed explanations of treatments are provided in the section further details.
8	Treatment: weeding	T:weed		Detailed explanations of treatments are provided in the section further details.
9	Treatment: weeding history	T:weed hist		Detailed explanations of treatments are provided in the section further details.
10	Treatment: seed addition	T:seed add		Detailed explanations of treatments are provided in the section further details.
11	Treatment: fertilizing	T:fert		Detailed explanations of treatments are provided in the section further details.
12	Treatment: drought	T:drought		Detailed explanations of treatments are provided in the section further details.
13	Treatment: aboveground: pesticide	T:abovegr pest		Detailed explanations of treatments are provided in the section further details.
14	Treatment: below pesticide	T:below pest		Detailed explanations of treatments are provided in the section further details.
15	Treatment: molluscide	T:mollus		Detailed explanations of treatments are provided in the section further details.
16	Treatment: nematicide	T:nema		Detailed explanations of treatments are provided in the section further details.
17	Treatment: eartworm exclosure	T:eartworm excl		Detailed explanations of treatments are provided in the section further details.
18	Treatment: phytometers	T:phyto		Detailed explanations of treatments are provided in the section further details.
19	Treatment: special	T:special		Detailed explanations of treatments are provided in the section further details.
20	Standing root biomass, fine roots	Stand root biom fine	g/m²	Measured on plot level
21	Standing root biomass, coarse roots	Stand root biom coarse	g/m²	Measured on plot level

License:

Creative Commons Attribution 3.0 Unported (CC-BY-3.0)

Size:

6560 data points

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