Earthworm data of the exploratory region in Romania (October 2012)

Usage Rights

This data is Free within projects.

Dataset Abstract

The belowground foodweb holds a big part of the associated biodiversity in forest ecosystems and plays a major role in litter decomposition and nutrient turnover. So far important interactions between diversity and composition of above- and belowground foodwebs have been observed, however, without being conclusive on the effects of tree species diversity on the belowground foodweb. The response of earthworms as important functional group in the soil ecosystem is assessed. The earthworm sampling records the abundance, biomass and species diversity of earthworms in each focal region. All (30 x 30) m2 plots are divided in nine (10 x 10) m2 subplots. In every plot, earthworms were sampled in the middle subplot. First (if present), a central litter sample (25x25cm) is taken followed by the 'mustard extraction method' over an area of 0,5 m² (0.5x1m) and a final soil sample (25x25x20cm) (length, width, depth) in the middle of this location. Litter and soil samples were taken to the lab for further handsorting, whereby the pit left after sampling was levelled off with surrounding soil. Sampled earthworms are stored in 70% ethanol solution.

Dataset Design

For every plot of the focal region, plots (30 x 30) m2 are divided in nine (10 x 10) m2 subplots. In every plot, earthworms were sampled in the middle subplot. In principle, within every middle subplot, the samples are taken randomly, but samples are not taken close to tree stems. First (if present), a central litter sample (25x25cm) is taken followed by the 'mustard extraction method' over an area of 0,5 m² (0.5x1m) and a final soil sample (25x25x20cm) (length, width, depth) in the middle of this location. When no litter is present, no litter sample could be taken and only a mustard extraction and soil sample is carried out. Litter and soil samples were taken to the lab for further handsorting, whereby the pit left after sampling was levelled off with surrounding soil. Sampled earthworms are stored in 70% ethanol solution.

Spatial Extent

Rasca, Romania

Temporal Extent

Autumn 2012

Taxonomic Extent

Earthworms

Measurement Circumstances

In some sites additional hand catches are performed, next to the standardized sampling. Hand catches are done within a distance of maximum 1m away from the focal earthworm sampling area. These hand catches are performed while conducting other measurements and samplings and as a consequence can only function as extra background information. See file attached to this dataset.

Freeformat files (1)

Data columns available in the raw data part of this dataset

Date
Data of sampling
Data group: Sampling moment
Values
2012-10-04
2012-10-03
2012-10-01
2012-10-02
2012-10-05
Time
Time of sampling
Data group: Sampling moment
Values
1899-12-30
PlotID
Unique plot id
Data group: Exploratory plot id
Values
ROM02
ROM05
ROM03
ROM01
ROM06
Name sampler
Name of person who sampled the earthworms
Data group: Executor
Values
Sam Ottoy; Cristian Corsei
Sam Ottoy
Paul Iliescu
Paul Iliescu; Cristian Corsei
Cristian Corsei
Sampling method
Method of sampling: L=Litter sample; M=Mustard extraction; S=Soil sample
Data group: Sampling method
Values
L
S
M
Slope length
Lengthwise slope of the sampled area. Value 0 if slope <5°; Datagroup description: Slope of the sampled area.
Unit: degree
Data group: Topography
Values
12
14
16
10
0
Slope Width
Slope Width
Data group: Topography
Values
0
Sample code
Sample point code (year/sampling responsible/country/chronological number of sampling action)
Data group: Sample code
Values
12HWRE001
12HWRE002
12HWRE005
12HWRE003
12HWRE004
Date on formol
Date on which the earthworm fixation in a 5% formaldehyde solution started
Data group: Fixation moment
Values
2012-10-17
Date back on ethanol
Date on which the earthworm is transferred from formaldehyde solution to 70% ethanol solution
Data group: Preservation moment
Values
2013-04-25
Date Identification
Data of earthworm identification
Data group: Identification moment
Values
NA
2013-10-05
Name observer - identifier
Name of person who identified and weighed the earthworm
Data group: Executor
Values
Jorgen Opdebeeck
NA
Victor Pop
Species
Earthworm species name, identified according to Pop et al. 2012_Zoology in the Middle East and the key of Bouché 1972 and Sims and Gerard 1999
Data group: Earthworm species
Values
Aporrectodea rosea
Allolobophora carpathica
Allolobophora sturanyi dacidoides
A sp.
Aporrectodea handlirschi
Development stage
Developmental stage of the earthworm: A= adult; S= subadult; J= juvenile ; / = development stage not determinable (Adult = clitellum, tubercula pubertatis and male pore developped; Subadult= clitellum, tubercula pubertatis and male pore not fully developped; Juvenile= no clitellum, tubercula pubertatis and male pore present)
Data group: Earthworm descriptor
Values
J
S
NA
A
/
Biomass
weight of the individual earthworm. 0 means no worm in sample
Unit: gram
Data group: Earthworm biomass
Values
0.01
0
0.024
0.017
0.02
Body part
Description of which part of the organism is sampled: Complete = entire organism; Head = only the rostral part; Tail = only the caudal part; Middle piece = only a middle part
Data group: Earthworm descriptor
Values
Tail
Complete
Head
Middle piece
NA
Density
Number of earthworm individuals scaled up to m², without additional correction for slope of the sampled area; 0 means no worms in sample
Unit: number
Data group: Earthworm density
Values
0
2
16
Biomass per square meter
Weight of the earthworm scaled up to 1m², without additional correction for slope of the sampled area; 0 means no worms in sample
Unit: gramsPerSquareMeter
Data group: Earthworm biomass
Values
0.02
0.04
0
0.048
0.06