Citation:

PANGAEA.854372

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Abstract:

This data set contains measurements of total nitrogen 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 by bi-annual weeding and mowing.

Soil sampling and analysis: Stratified soil sampling was performed before sowing in April 2002. Five independent samples per plot were taken using a split tube sampler with an inner diameter of 4.8 cm (Eijkelkamp Agrisearch Equipment, Giesbeek, the Netherlands). Soil samples were dried at 40°C and then segmented to a depth resolution of 5 cm giving six depth subsamples per core. All samples were analyzed independently and averaged values per depth layer are reported. Sampling locations were less than 30 cm apart from sampling locations in other years. Subsequently, samples were dried at 40°C. All soil samples were passed through a sieve with a mesh size of 2 mm. Rarely present visible plant remains were removed using tweezers. Total nitrogen concentration was analyzed on ball-milled subsamples (time 4 min, frequency 30 s-1) by an elemental analyzer at 1150°C (Elementaranalysator vario Max CN; Elementar Analysensysteme GmbH, Hanau, Germany).

Related to:

Steinbeiss, Sibylle; Bessler, Holger; Engels, Christof; Temperton, Vicky; Buchmann, Nina; Roscher, Christiane; Kreutziger, Yvonne; Baade, Jussi; Habekost, Maike; Gleixner, Gerd (2008): Plant diversity positively affects short-term soil carbon storage in experimental grasslands. Global Change Biology, 14, 2937-2949, https://doi.org/10.1111/j.1365-2486.2008.01697.x

Further details:

Plot information of the Jena Main Experiment

Treatment description

Roscher, Christiane; Schumacher, Jens; Baade, Jussi; Wilcken, Sara; Gleixner, Gerd; Weisser, Wolfgang W; Schmid, Bernhard; Schulze, Ernst-Detlef (2004): The role of biodiversity for element cycling and trophic interactions: an experimental approach in a grassland community. Basic and Applied Ecology, 5(2), 107-121, https://doi.org/10.1078/1439-1791-00216

Project(s):

The Jena Experiment (JenExp)

Coverage:

Latitude: 50.946100 * Longitude: 11.611300

Date/Time Start: 2002-01-01T00:00:00 * Date/Time End: 2002-12-31T00:00:00

Minimum DEPTH, soil: 0.025 m * Maximum DEPTH, soil: 0.275 m

Event(s):

JenExp_2002 (Jena Experiment 2002) * Latitude: 50.946100 * Longitude: 11.611300 * Date/Time Start: 2002-01-01T00:00:00 * Date/Time End: 2002-12-31T00:00:00 * Location: Thuringia, Germany * Method/Device: Experiment (EXP)

Comment:

In 2002 and 2007, measurements of total nitrogen in a depth of up to 1m (depth resolution of 5 cm giving 20 depth subsamples) are available.

In addition to measurements of total nitrogen determined from dried soil samples, measurement of dissolved nitrogen in soil solution and measurements of mineral nitrogen from KCl-extractions of soil samples are available.

This datasets is part of a time series of soil nitrogen measurements in the Main Experiment since 2002 (doi:10.1594/PANGAEA.854372).

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	Nitrogen, total	TN	%

License:

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

Size:

9347 data points

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