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Title:
Main Experiment: Seed addition experiment Site A (VIPs) - biomass data
Access rights:
Free within projects
Usage rights:
BEF-China: SP11
Published:
No information available
Abstract:
While diversity-invasibility relationships have often been addressed in experimental grassland communities, experimental approaches in forests are less common, especially in species-rich subtropical regions. Forest ecosystems feature higher complexity than grassland ecosystems, since they are composed by different vertical layers covering a high level of horizontal heterogeneity. In the context of the Main Experiment with diversity levels from 1 to 24, we established a seed addition experiment with groups of native and exotic herbaceous species. In this early-successional forest system, seed mixtures for both groups were created with high and low functional diversity, sown into subplots along the tree diversity gradient of and harvested after one vegetation period.
Design:
The seed addition experiment was established on Site A for analyzing the impact of tree diversity on herb layer invasibility and finished with harvest in October 2010. The seed addition experiment was conducted within 32 plots representing the full tree diversity gradient at Site A. These selected 32 plots included the tree diversity levels one (n = 16), two (n = 8), four (n = 4) eight (n = 2), 16 (n =1) and 24 (n = 1). Within the northern five rows of each plot, six subplots (2 m × 2 m) containing four trees, respectively, were randomly selected and established in March 2010. Thus, the seed addition was based on a total of 189 (32 × 6) subplots, each experiencing a neighbourhood tree diversity ranging from one to four (1, 2, 4). Within each subplot, seeds were added to a core area of 1 m² in the centre and surrounded by four target tree individuals, whereas the adjacent area served as a buffer zone The six subplots per plot were assigned to different seed addition treatments. Seed addition was applied by using five different seed mixtures, which were composed by six different species each. The species are annuals, bi-annuals or perennials and represent typical species of ruderal, disturbed sites like clear-cut forest areas. Two seed mixtures were composed by native species (N) or exotic species (E) only. Within each of the groups of native and exotic species, one seed mixture was composed by functionally dissimilar species (N high and E high) and a second mixture by functionally similar species (N low and E low). A fifth seed mixture was composed by three exotic and three native species (EN) and a sixth subplot per plot received no seed addition and served as an internal control. In April 2010, each seed addition subplot received a total of 2400 seeds per m², i.e. 400 seeds per each species were sown into the subplot’s core area. Measurements of exposition and inclination were conducted in April 2010 for each subplot. Relative light conditions for each subplot were recorded in April and August 2010.
Spatial extent:
Main experiment, Site A, no shrub VIPs 29°08'-29°11'N 117°90'-117°93'E
Temporal extent:
Initial seed addition was performed in April 2010
Taxonomic extent:
The following herb species were used for seed addition:
Measurement cirumstances:
No information available
Data analysis:
relative light conditions, inclination, exposition; for details see data group description.

Filter:
Dataset column

Name:
PTAG
Definition:
6 digits plotnumber of main experimental site A. Research plots on the main experiment have a "p" in front of their IDs and then a 6 digit code: Plots in the main sites A and B are named according to their position in the original spreadsheet, in which they were designed. They consist of 6 digits: _1st digit_: Site (1:A, 2:B), _digit 2and3_: southwards row: as in spreadsheets the rows are named from the top to the bottom; _digit 4 and 5_: westward column: as in the original spreadsheet, but the letters are converted to numbers (A=01, B=02); _6th digit_: indicator, if the plot has been shifted a quarter mu. Example: "p205260": "p" means that this is a plot that is specified. "2" means, that we are at site B. Now the coordinates of the south - west corner: "0526". Since "e" is the fifth letter of the alphabet, this is Plot E26. The last digit "0" means that this plot was not moved by a quarter of a Mu, as some sites in Site A. The 6th digit can also indicate the subplot within the plot. "5", "6", "7", "8" indicate the northwest, northeast, southeast, and southwest quarter plot respectively.
Unit:
No information available
Datagroup:
BEF research plot name
Keywords:
VIP plots, Site A
Values:
p103320
p105310
p106210
p105340
p106330
Contributors:
No information available

Dataset column

Name:
plotnumber
Definition:
Plotnumber
Unit:
No information available
Datagroup:
Helper
Keywords:
No information available
Values:
F33
F21
E31
E34
C32
Contributors:
No information available

Dataset column

Name:
treatment
Definition:
seed addition treatment; Datagroup description: seed addition treatment for each subplot: C-Control with no seed addition; E-high- seed addition of six exotic species which are functionally dissimilar;E-low- seed addition of six exotic species which are functionally similar;N-high- seed addition of six native species which are functionally dissimilar;N-low- seed addition of six native species which are functionally similar;EN-seed addition of three native and three exotic species
Unit:
No information available
Datagroup:
Treatment
Keywords:
experimental treatment, seed addition
Values:
EN
E_low
N_high
C
E_high
Contributors:
No information available

Dataset column

Name:
treatment2
Definition:
seed addition treatment; Datagroup description: category treatment: c-Control with no seed addition: n- seed addition of native species; e- seed addition of exotic species; en- seed addition of exotic and native species
Unit:
No information available
Datagroup:
Treatment
Keywords:
experimental treatment, exotic species, seed addition, native species
Values:
c
e
n
en
Contributors:
No information available

Dataset column

Name:
treatment3
Definition:
seed addition treatment; Datagroup description: category treatment: SA- Plots with seed addition; NSA- Plots with no seed addition
Unit:
No information available
Datagroup:
Treatment
Keywords:
experimental treatment, seed addition
Values:
SA
NSA
Contributors:
No information available

Dataset column

Name:
tree_diversity
Definition:
tree diversity
Unit:
No information available
Datagroup:
Taxonomic biodiversity
Keywords:
Diversity level
Values:
2
24
4
1
16
Contributors:
No information available

Dataset column

Name:
neighbourhood_tree_diversity
Definition:
tree diversity; Datagroup description: neighbourhood tree diversity of the subplots; for plots with tree diversity 4-24, the neighbourhood tree diversity is 4;
Unit:
No information available
Datagroup:
Neighbourhood diverstiy
Keywords:
competitive neighbourhood, diversity
Values:
2
4
1
Contributors:
No information available

Dataset column

Name:
date
Definition:
date; Datagroup description: mean date for each monitoring campaign, harvest started 2010-09-20 and were finished 2010-10-06
Unit:
No information available
Datagroup:
Date time information
Keywords:
date
Values:
2010-09-28
Contributors:
No information available

Dataset column

Name:
FD
Definition:
Functional diversity
Unit:
No information available
Datagroup:
Functional biodiversity
Keywords:
Rao's Q
Values:
0.010892129003350702
0.006293027408115146
0.017580817137149474
0.007032031661428927
0.017856129686811068
Contributors:
No information available

Dataset column

Name:
dry_weight_exotic_total
Definition:
aboveground biomass of all added exotic species at time of harvest; dry weight was determined after 48 hours in a drying oven at 72 °C; Datagroup description: aboveground biomass of all added exotic species at time of harvest; dry weight was determined after 48 hours in a drying oven at 72 °C
Unit:
gram
Datagroup:
Above and below ground biomass measurement
Keywords:
dry weight, aboveground biomass, exotic species
Values:
0.024
0.018000000000000002
0
0.011
0.005
Contributors:
No information available

Dataset column

Name:
dry_weight_nativ_total
Definition:
aboveground biomass of all added native species at time of harvest; dry weight was determined after 48 hours in a drying oven at 72 °C; Datagroup description: aboveground biomass of all added native species at time of harvest; dry weight was determined after 48 hours in a drying oven at 72 °C
Unit:
gram
Datagroup:
Above and below ground biomass measurement
Keywords:
dry weight, aboveground biomass, native species
Values:
0
0.008
0.013000000000000001
0.005
0.027
Contributors:
No information available

Dataset column

Name:
dry_weight_SA_total
Definition:
aboveground biomass of all added species at time of harvest; dry weight was determined after 48 hours in a drying oven at 72 °C; Datagroup description: aboveground biomass of all added species at time of harvest; dry weight was determined after 48 hours in a drying oven at 72 °C
Unit:
gram
Datagroup:
Above and below ground biomass measurement
Keywords:
dry weight, aboveground biomass
Values:
0.04
0
0.011
0.013000000000000001
0.03
Contributors:
No information available

Dataset column

Name:
dry_weight_other_total
Definition:
aboveground biomass of the herb layer community at time of harvest; dry weight was determined after 48 hours in a drying oven at 72 °C; Datagroup description: aboveground biomass of the herb layer community at time of harvest; dry weight was determined after 48 hours in a drying oven at 72 °C
Unit:
gram
Datagroup:
Above and below ground biomass measurement
Keywords:
herb layer, dry weight, aboveground biomass
Values:
1009.16
0.179
0.39
0
0.406
Contributors:
No information available

Dataset column

Name:
dry_weight_subplot_total
Definition:
aboveground biomass of each subplot at time of harvest; dry weight was determined after 48 hours in a drying oven at 72 °C; Datagroup description: aboveground biomass of each subplot at time of harvest; dry weight was determined after 48 hours in a drying oven at 72 °C
Unit:
gram
Datagroup:
Above and below ground biomass measurement
Keywords:
dry weight, aboveground biomass
Values:
0.425
0.509
0
0.9810000000000001
1010.216
Contributors:
No information available

Dataset column

Name:
species_richness_total
Definition:
species richness of all species
Unit:
No information available
Datagroup:
Taxonomic biodiversity
Keywords:
species richness, response variable
Values:
11
12
0
10
13
Contributors:
No information available

Dataset column

Name:
species_richness_exotic
Definition:
species richness of exotic species; Datagroup description: number of species of added exotic species only
Unit:
No information available
Datagroup:
Taxonomic biodiversity
Keywords:
species richness, response variable, exotic species
Values:
2
4
3
1
0
Contributors:
No information available

Dataset column

Name:
species_richness_nativ
Definition:
species richness of native species; Datagroup description: number of species of added native species only
Unit:
No information available
Datagroup:
Taxonomic biodiversity
Keywords:
species richness, response variable, native species
Values:
2
4
1
3
0
Contributors:
No information available

Dataset column

Name:
cover_SA
Definition:
cover of added species (exotic and native) by subplot
Unit:
percent
Datagroup:
Cover of species
Keywords:
vegetation cover
Values:
10
11
0
12
1
Contributors:
No information available

Dataset column

Name:
cover_exotic
Definition:
cover of added exotic species by subplot; Datagroup description: cover of added exotic species by subplot
Unit:
percent
Datagroup:
Cover of species
Keywords:
vegetation cover, exotic species
Values:
1
12
10
0
11
Contributors:
No information available

Dataset column

Name:
cover_nativ
Definition:
cover of added native species by subplot; Datagroup description: cover of added native species by subplot
Unit:
percent
Datagroup:
Cover of species
Keywords:
vegetation cover, native species
Values:
10
12
11
1
0
Contributors:
No information available

Dataset column

Name:
cover_herb
Definition:
cover of resident herbaceous species by subplot; Datagroup description: cover of resident herbaceous species by subplot
Unit:
percent
Datagroup:
Cover of species
Keywords:
herb layer, vegetation cover
Values:
100
15
10
13
1
Contributors:
No information available

Dataset column

Name:
cover_shrub
Definition:
cover of resident woody species by subplot; Datagroup description: cover of resident woody species by subplot
Unit:
percent
Datagroup:
Cover of species
Keywords:
shrub, vegetation cover
Values:
15
0
1
10
100
Contributors:
No information available

Dataset column

Name:
cover_total
Definition:
cover of resident community and added species each subplot; Datagroup description: cover of resident community and added species each subplot
Unit:
percent
Datagroup:
Cover of species
Keywords:
vegetation cover
Values:
20
17
100
25
15
Contributors:
No information available

Dataset column

Name:
herb_height
Definition:
maximum height of herbaceous species by subplot
Unit:
centimeter
Datagroup:
Plant height
Keywords:
herb layer, height
Values:
10
103
0
104
100
Contributors:
No information available

Dataset column

Name:
shrub_height
Definition:
maximum height of woody species by subplot; Datagroup description: maximum height of woody species by subplot
Unit:
centimeter
Datagroup:
Plant height
Keywords:
height, shrub
Values:
12
110
100
105
11
Contributors:
No information available

Dataset column

Name:
ab_ex
Definition:
abundance of added exotic species
Unit:
No information available
Datagroup:
Abundance
Keywords:
abundance, response variable, exotic species, seed addition
Values:
101
10
1
100
0
Contributors:
No information available

Dataset column

Name:
ab_nativ
Definition:
abundance of added native species; Datagroup description: abundance of added native species
Unit:
No information available
Datagroup:
Abundance
Keywords:
abundance, response variable, native species, seed addition
Values:
11
13
10
0
1
Contributors:
No information available

Dataset column

Name:
ab_SA
Definition:
abundance of added species (exotic and native); Datagroup description: abundance of added species (exotic and native)
Unit:
No information available
Datagroup:
Abundance
Keywords:
abundance, response variable, seed addition
Values:
10
11
1
0
101
Contributors:
No information available

Dataset column

Name:
RGR_h
Definition:
relative growth rate of the mean height of the four adjacent trees by subplot for the time period April -September 2010
Unit:
centimeterPerMonth
Datagroup:
Relative growth rate
Keywords:
growth, trees
Values:
0
0.75
0.4
0.6000000000000001
0.467
Contributors:
No information available

Dataset column

Name:
RGR_d
Definition:
relative growth rate of the mean diameter of the four adjacent trees by subplot for the time period April -September 2010; Datagroup description: relative growth rate of the mean diameter of the four adjacent trees by subplot for the time period April -September 2010; Instrumentation: digital caliper
Unit:
centimeterPerMonth
Datagroup:
Relative growth rate
Keywords:
growth, trees
Values:
0.005
0.0025000000000000066
0.00667
0
0.00125
Contributors:
No information available

No information available


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22 erfmeier medium

Alexandra
Erfmeier

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23 Datasets

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1 Projects

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73 pohl medium

Ricarda
Pohl

Owner of:
9 Datasets

Involved in:
2 Projects

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