Citation:

PANGAEA.866358

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Abstract:

This data set contains aboveground community biomass (Sown plant community, measured in biomass as dry weight) and species-specific biomass from the sown species of 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.

Aboveground community biomass was harvested in September 2002 just prior to mowing (during peak standing biomass) on all experimental plots of the main experiment. This was done by clipping the vegetation at 3 cm above ground in one rectangle of 0.2 x 0.5 m per large plot. The location of the rectangle was assigned prior to harvest by random selection of coordinates within the core area of the plots (i.e. the central 10 x 15 m). The positions of the rectangle within plots were identical for all plots. The harvested biomass was sorted into categories: in 2002 only individual species for the sown plant species were separated and processed. All biomass was dried to constant weight (70°C, >= 48 h) and weighed. Sown plant community biomass was calculated as the sum of the biomass of the individual sown species. Overall, analyses of the community biomass data have identified species richness as well as functional group composition as important drivers of a positive biodiversity-productivity relationship.

Related to:

Roscher, Christiane; Temperton, Vicky; Scherer-Lorenzen, Michael; Schmid, Bernhard; Schmitz, Martin; Schumacher, Jens; Buchmann, Nina; Weisser, Wolfgang W; Schulze, Ernst-Detlef (2005): Overyielding in experimental grassland communities - irrespective of species pool or spatial scale. Ecology Letters, 8(4), 419-429, https://doi.org/10.1111/j.1461-0248.2005.00736.x

Weigelt, Alexandra; Marquard, Elisabeth; Temperton, Vicky; Roscher, Christiane; Scherber, Christoph; Mwangi, Peter N; von Felten, Stefanie; Buchmann, Nina; Schmid, Bernhard; Schulze, Ernst-Detlef; Weisser, Wolfgang W (2010): The Jena Experiment: six years of data from a grassland biodiversity experiment. Ecology, 91(3), 930-931, https://doi.org/10.1890/09-0863.1

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 HEIGHT above ground: 0.485 m * Maximum HEIGHT above ground: 0.485 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:

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”.

To calculate plot and annual means from the species specific biomass given per subsample it is important to be aware of the special missing values in the data set. Plots with single missing values indicated by "-9999", result in a difference between the following means: (1) first sum up species specific biomass per subsample for all contained species to calculated a sown species community biomass per subsample and then average the values over the subsamples per plot or (2) first average species specific biomass over subplots to get an average species specific biomass per plot and then sum these averages for all contained species to get an overall plot mean.

In September 2002, only the biomass of the species from the sown plant community was registered. In contrast to later years, no data on the “Weed plant community”, “Dead plant material”, and “Unidentified plant material” is available.

This datasets is part of a time series of biomass measurements in the Main Experiment since 2002 (doi:10.1594/PANGAEA.866358).

Parameter(s):

#	Name	Short Name	Unit	Method/Device	Comment
1	Experimental plot	Experimental plot			Detailed explanations of plots and the plant diversity gradient are provided in the section "further details".
2	Height aboveground, minimum	Height abovegr min	m		Vegetation was cut in 3cm above the soil surface.
3	Height aboveground, maximum	Height abovegr max	m		Rough approximation of maximum vegetation height
4	HEIGHT above ground	Height	m		Geocode – Average of min and max value
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	Dead plant material, biomass as dry weight	Dead plant mat biom	g/m²	Dried biomass sample	Measured on plot level
21	Sown plant community, biomass as dry weight	Sown plant biom	g/m²	Dried biomass sample	Measured on plot level
22	Alopecurus pratensis, biomass as dry weight	A. pratensis biom	g/m²	Dried biomass sample	Measured on species level
23	Anthoxanthum odoratum, biomass as dry weight	A. odoratum biom	g/m²	Dried biomass sample	Measured on species level
24	Arrhenatherum elatius, biomass as dry weight	A. elatius biom	g/m²	Dried biomass sample	Measured on species level
25	Avenula pubescens, biomass as dry weight	A. pubescens biom	g/m²	Dried biomass sample	Measured on species level
26	Bromus erectus, biomass as dry weight	B. erectus biom	g/m²	Dried biomass sample	Measured on species level
27	Bromus hordeaceus, biomass as dry weight	B. hordeaceus biom	g/m²	Dried biomass sample	Measured on species level
28	Cynosurus cristatus, biomass as dry weight	C. cristatus biom	g/m²	Dried biomass sample	Measured on species level
29	Dactylis glomerata, biomass as dry weight	D. glomerata biom	g/m²	Dried biomass sample	Measured on species level
30	Festuca pratensis, biomass as dry weight	F. pratensis biom	g/m²	Dried biomass sample	Measured on species level
31	Festuca rubra, biomass as dry weight	F. rubra biom	g/m²	Dried biomass sample	Measured on species level
32	Holcus lanatus, biomass as dry weight	H. lanatus biom	g/m²	Dried biomass sample	Measured on species level
33	Luzula campestris, biomass as dry weight	L. campestris biom	g/m²	Dried biomass sample	Measured on species level
34	Phleum pratense, biomass as dry weight	P. pratense biom	g/m²	Dried biomass sample	Measured on species level
35	Poa pratensis, biomass as dry weight	P. pratensis biom	g/m²	Dried biomass sample	Measured on species level
36	Poa trivialis, biomass as dry weight	P. trivialis biom	g/m²	Dried biomass sample	Measured on species level
37	Trisetum flavescens, biomass as dry weight	T. flavescens biom	g/m²	Dried biomass sample	Measured on species level
38	Ajuga reptans, biomass as dry weight	A. reptans biom	g/m²	Dried biomass sample	Measured on species level
39	Bellis perennis, biomass as dry weight	B. perennis biom	g/m²	Dried biomass sample	Measured on species level
40	Glechoma hederacea, biomass as dry weight	G. hederacea biom	g/m²	Dried biomass sample	Measured on species level
41	Leontodon autumnalis, biomass as dry weight	L. autumnalis biom	g/m²	Dried biomass sample	Measured on species level
42	Leontodon hispidus, biomass as dry weight	L. hispidus biom	g/m²	Dried biomass sample	Measured on species level
43	Plantago lanceolata, biomass as dry weight	P. lanceolata biom	g/m²	Dried biomass sample	Measured on species level
44	Plantago media, biomass as dry weight	P. media biom	g/m²	Dried biomass sample	Measured on species level
45	Primula veris, biomass as dry weight	P. veris biom	g/m²	Dried biomass sample	Measured on species level
46	Prunella vulgaris, biomass as dry weight	P. vulgaris biom	g/m²	Dried biomass sample	Measured on species level
47	Ranunculus repens, biomass as dry weight	R. repens biom	g/m²	Dried biomass sample	Measured on species level
48	Taraxacum officinale, biomass as dry weight	T. officinale biom	g/m²	Dried biomass sample	Measured on species level
49	Veronica chamaedrys, biomass as dry weight	V. chamaedrys biom	g/m²	Dried biomass sample	Measured on species level
50	Achillea millefolium, biomass as dry weight	A. millefolium biom	g/m²	Dried biomass sample	Measured on species level
51	Anthriscus sylvestris, biomass as dry weight	A. sylvestris biom	g/m²	Dried biomass sample	Measured on species level
52	Campanula patula, biomass as dry weight	C. patula biom	g/m²	Dried biomass sample	Measured on species level
53	Carum carvi, biomass as dry weight	C. carvi biom	g/m²	Dried biomass sample	Measured on species level
54	Cardamine pratensis, biomass as dry weight	C. pratensis biom	g/m²	Dried biomass sample	Measured on species level
55	Centaurea jacea, biomass as dry weight	C. jacea biom	g/m²	Dried biomass sample	Measured on species level
56	Cirsium oleraceum, biomass as dry weight	C. oleraceum biom	g/m²	Dried biomass sample	Measured on species level
57	Crepis biennis, biomass as dry weight	C. biennis biom	g/m²	Dried biomass sample	Measured on species level
58	Daucus carota, biomass as dry weight	D. carota biom	g/m²	Dried biomass sample	Measured on species level
59	Galium mollugo, biomass as dry weight	G. mollugo biom	g/m²	Dried biomass sample	Measured on species level
60	Geranium pratense, biomass as dry weight	G. pratense biom	g/m²	Dried biomass sample	Measured on species level
61	Heracleum sphondylium, biomass as dry weight	H. sphondylium biom	g/m²	Dried biomass sample	Measured on species level
62	Knautia arvensis, biomass as dry weight	K. arvensis biom	g/m²	Dried biomass sample	Measured on species level
63	Leucanthemum vulgare, biomass as dry weight	L. vulgare biom	g/m²	Dried biomass sample	Measured on species level
64	Pastinaca sativa, biomass as dry weight	P. sativa biom	g/m²	Dried biomass sample	Measured on species level
65	Pimpinella major, biomass as dry weight	P. major biom	g/m²	Dried biomass sample	Measured on species level
66	Ranunculus acris, biomass as dry weight	R. acris biom	g/m²	Dried biomass sample	Measured on species level
67	Rumex acetosa, biomass as dry weight	R. acetosa biom	g/m²	Dried biomass sample	Measured on species level
68	Sanguisorba officinalis, biomass as dry weight	S. officinalis biom	g/m²	Dried biomass sample	Measured on species level
69	Tragopogon pratensis, biomass as dry weight	T. pratensis biom	g/m²	Dried biomass sample	Measured on species level
70	Lathyrus pratensis, biomass as dry weight	L. pratensis biom	g/m²	Dried biomass sample	Measured on species level
71	Lotus corniculatus, biomass as dry weight	L. corniculatus biom	g/m²	Dried biomass sample	Measured on species level
72	Medicago lupulina, biomass as dry weight	M. lupulina biom	g/m²	Dried biomass sample	Measured on species level
73	Medicago x varia, biomass as dry weight	M. x varia biom	g/m²	Dried biomass sample	Measured on species level
74	Onobrychis viciifolia, biomass as dry weight	O. viciifolia biom	g/m²	Dried biomass sample	Measured on species level
75	Trifolium campestre, biomass as dry weight	T. campestre biom	g/m²	Dried biomass sample	Measured on species level
76	Trifolium dubium, biomass as dry weight	T. dubium biom	g/m²	Dried biomass sample	Measured on species level
77	Trifolium fragiferum, biomass as dry weight	T. fragiferum biom	g/m²	Dried biomass sample	Measured on species level
78	Trifolium hybridum, biomass as dry weight	T. hybridum biom	g/m²	Dried biomass sample	Measured on species level
79	Trifolium pratense, biomass as dry weight	T. pratense biom	g/m²	Dried biomass sample	Measured on species level
80	Trifolium repens, biomass as dry weight	T. repens biom	g/m²	Dried biomass sample	Measured on species level
81	Vicia cracca, biomass as dry weight	V. cracca biom	g/m²	Dried biomass sample	Measured on species level

License:

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

Size:

2344 data points

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