Citation:

PANGAEA.854372

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Abstract:

This data set contains measurements of dissolved nitrogen (total dissolved nitrogen: TDN, dissolved organic nitrogen: DON, dissolved ammonium: NH4+, and dissolved nitrate: NO3-) in samples of soil water collected 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.

In April 2002 glass suction plates with a diameter of 12 cm, 1 cm thickness and a pore size of 1–1.6 µm (UMS GmbH, Munich, Germany) were installed in depths of 10, 20, 30 and 60 cm to collect soil solution. The sampling bottles were continuously evacuated to a negative pressure between 50 and 350 mbar, such that the suction pressure was about 50 mbar above the actual soil water tension. Thus, only the soil leachate was collected. Cumulative soil solution was sampled biweekly and analyzed for nitrate (NO3-) and ammonium (NH4+) concentrations with a continuous flow analyzer (CFA, Skalar, Breda, The Netherlands). Nitrate was analyzed photometrically after reduction to NO2- and reaction with sulfanilamide and naphthylethylenediamine-dihydrochloride to an azo-dye. Our NO3- concentrations contained an unknown contribution of NO2- that is expected to be small. Simultaneously to the NO3- analysis, NH4+ was determined photometrically as 5-aminosalicylate after a modified Berthelot reaction. The detection limits of NO3- and NH4+ were 0.02 and 0.03 mg N L-1, respectively. Total dissolved N in soil solution was analyzed by oxidation with K2S2O8 followed by reduction to NO2- as described above for NO3-. Dissolved organic N (DON) concentrations in soil solution were calculated as the difference between TDN and the sum of mineral N (NO3- + NH4+). In 5% of the samples, TDN was equal to or smaller than mineral N. In these cases, DON was assumed to be zero.

Related to:

Oelmann, Yvonne; Kreutziger, Yvonne; Temperton, Vicky; Buchmann, Nina; Roscher, Christiane; Schumacher, Jens; Schulze, Ernst-Detlef; Weisser, Wolfgang W; Wilcke, Wolfgang (2007): Nitrogen and Phosphorus Budgets in Experimental Grasslands of Variable Diversity. Journal of Environmental Quality, 36(2), 396, https://doi.org/10.2134/jeq2006.0217

Oelmann, Yvonne; Wilcke, Wolfgang; Temperton, Vicky; Buchmann, Nina; Roscher, Christiane; Schumacher, Jens; Schulze, Ernst-Detlef; Weisser, Wolfgang W (2007): Soil and Plant Nitrogen Pools as Related to Plant Diversity in an Experimental Grassland. Soil Science Society of America Journal, 71(3), 720, https://doi.org/10.2136/sssaj2006.0205

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: 0.1 m * Maximum DEPTH, soil: 0.6 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:

During summer months, soil frequently dries out so that no soil pore water can be collected. Consequently, in these periods, no dissolved nitrogen concentrations can be determined.

Only in block 2 suction plates were installed in all four depth layers. Suction plates in 30 centimeter depth were installed in block 1 and 3 in 2002. In 2005, additional suctions plates were installed in 20 centimeter depth in block 1 and 3. In block 4, no samples are available because no plates were installed also in block 1 and 3 there are no plates and thus no data from 10 and 60 centimeter depths.

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 in the case 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".

In addition to measurement of dissolved nitrogen in soil solution, measurements of total nitrogen determined from dried soil samples 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, organic, dissolved	DON	mg/l
21	Ammonium, dissolved	[NH4]+ diss	mg/l
22	Nitrate, dissolved	[NO3]- diss	mg/l
23	Nitrogen, total dissolved	TDN	mg/l

License:

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

Size:

21180 data points

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