Citation:

PANGAEA.854466

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Abstract:

This data set contains measurements of dissolved phosphorus (total dissolved nitrogen: TDP, dissolved inorganic phosphorus: PO4P and dissolved organic phosphorus: DOP) in samples of soil water collected in 2003 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.

Glass suction plates with a diameter of 12 cm, 1 cm thickness and a pore size of 1–1.6 mm (UMS GmbH, Munich, Germany) were installed in April 2002 in depths of 10, 20, 30 and 60 cm to collect soil solution. Manual soil matric potential measurements were used to regulate the vacuum system. 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 bi-weekly, in 2003 at the 07.03.2003; 24.03.2003; 07.04.2003; 22.04.2003; 07.05.2003; 20.05.2003; 03.06.2003; 28.07.2003; 12.09.2003; 22.09.2003; 07.10.2003; and 21.10.2003, and analyzed for dissolved inorganic P (PO4P) and total dissolved phosphorus (TDP).

Inorganic phosphorus concentrations in the soil solution were measured photometrically with a continuous flow analyzer (CFA SAN++, Skalar [Breda, The Netherlands]). Ammonium molybdate catalyzed by antimony tartrate reacts in an acidic medium with phosphate and forms a phospho-molybdic acid complex. Ascorbic acid reduces this complex to an intensely blue-colored complex. Total dissolved P in soil solution was analyzed by irradiation with UV and oxidation with K2S2O8 followed by reaction with ammonium molybdate (Skalar catnr. 503-553w/r). As the molybdic complex forms under strongly acidic conditions, we could not exclude the hydrolysis of labile organic P compounds in our samples. Furthermore, the molybdate reaction is not sensitive for condensed phosphates. The detection limits of both TDP and PO4P were 0.02 mg P l-1 (CFA, Skalar). Dissolved organic P (DOP) in soil solution was calculated as the difference between TDP and PO4P. In a low number of samples, TDP was equal to or smaller than PO4P; in these cases, DOP 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; Richter, Anika K; Roscher, Christiane; Rosenkranz, Stephan; Temperton, Vicky; Weisser, Wolfgang W; Wilcke, Wolfgang (2011): Does plant diversity influence phosphorus cycling in experimental grasslands? Geoderma, 167-168, 178-187, https://doi.org/10.1016/j.geoderma.2011.09.012

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: 2003-01-01T00:00:00 * Date/Time End: 2003-12-31T00:00:00

Minimum DEPTH, soil: 0.1 m * Maximum DEPTH, soil: 0.6 m

Event(s):

JenExp_2003 (Jena Experiment 2003) * Latitude: 50.946100 * Longitude: 11.611300 * Date/Time Start: 2003-01-01T00:00:00 * Date/Time End: 2003-12-31T00:00:00 * 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, no data can be provided during such periods.

In 2002, only in block 2 suction plates were installed in all four depth layers. In block 1 and 3, suction plates were installed only in 30 centimeter depth. 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.

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 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 measurements of dissolved phosphorus (organic, inorganic, and total) determined from bi-weekly soil solution samples, measurement of dissolved inorganic phosphorus in soil solution aggregated to seasonal values, phosphorus fractions in soil, and total phosphorus from soil samples are available.

This datasets is part of a collection of soil phosphorus measurements in the Main Experiment since 2002 (doi:10.1594/PANGAEA.854466).

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	Phosphorus, organic, dissolved	DOP	mg/l	Measured on plot level
21	Phosphorus, inorganic, dissolved	DIP	mg/l	Measured on plot level
22	Phosphorus, total dissolved	TDP	mg/l	Measured on plot level

License:

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

Size:

68880 data points

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