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Title:
Main Experiment: Seed addition experiment Site A (VIPs) – abiotic predictor variables
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: Ageratum conyzoides, Amaranthus spinosus, Bidens frondosa, Chenopodium ambrosioides, Conyza canadensis, Erigeron annuus, Gynura crepidioides, Oenothera biennis, Solidago canadensis, Artemisia lavandulaefolia, Artemisia anomala, Bidens biternata, Chenopodium album, Corchoropsis tomentosa, Lactuca formosana, Rumex japonicus, Siegesbeckia glabrescens, Solanum nigrum
Measurement cirumstances:
No information available
Data analysis:
relative light conditions, inclination, exposition; for details see data group description.

Filter:
Dataset column

Name:
PTAG
Definition:
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
Values:
p105340
p105310
p106210
p106330
p103320
Contributors:
No information available

Dataset column

Name:
plot
Definition:
plot
Unit:
No information available
Datagroup:
Helper
Keywords:
No information available
Values:
E31
C32
F33
F21
E34
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:
VIP plots, Main Experiment, Site A
Values:
E_high
E_low
N_high
C
EN
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:
VIP plots, Main Experiment, Site A
Values:
c
n
e
en
Contributors:
No information available

Dataset column

Name:
treatment3
Definition:
seed addition treatment; Datagroup description: category treatment: SA- Plots with ssed addition; NSA- Plots with no seed addition
Unit:
No information available
Datagroup:
Treatment
Keywords:
VIP plots, Main Experiment, Site A
Values:
SA
NSA
Contributors:
No information available

Dataset column

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

Dataset column

Name:
date
Definition:
date; Datagroup description: Exposition and inclination were measured from 2010-03-01 till 2010-03-20; light conditions in April were measured from 2010-04-25 till 2010-05-05; light conditions in August were measured from 2010-08-17 till 2010-08-26
Unit:
No information available
Datagroup:
Date time information
Keywords:
date
Values:
2010-04-10
Contributors:
No information available

Dataset column

Name:
exposition
Definition:
topography, aspect in which the respective plot is facing, given as a category
Unit:
No information available
Datagroup:
Aspect Categories
Keywords:
exposition, topography
Values:
0
N
NE
NW
E
Contributors:
No information available

Dataset column

Name:
inclination
Definition:
topography; Datagroup description: inclination of each subplot in degree
Unit:
degree
Datagroup:
Inclination
Keywords:
inclination
Values:
11
12
14
15
13
Contributors:
No information available

Dataset column

Name:
light_april_above
Definition:
relative light condition (PAR)
Unit:
percent
Datagroup:
Solar radiation
Keywords:
solar radiation
Values:
0.9064040132142421
0.8597523816870446
0.9006857413100023
0.9214413875598086
0.8567829342206904
Contributors:
No information available

Dataset column

Name:
light_april_ground
Definition:
relative light condition (PAR); Datagroup description: ground level of each subplot, 5 measuring points were recorded and put in relation to a control value (measured at a height of above 2 m) in April 2010
Unit:
percent
Datagroup:
Solar radiation
Keywords:
solar radiation
Values:
0.23247799856091214
0.27314886552296624
0.12718688421218569
0.2317484051036683
0.3047092469018112
Contributors:
No information available

Dataset column

Name:
light_august_above
Definition:
relative light condition (PAR); Datagroup description: at 0.5 m height of each subplot, 5 measuring points were recorded and put in relation to a control value (measured at a height of above 2 m) in August 2010
Unit:
percent
Datagroup:
Solar radiation
Keywords:
solar radiation
Values:
0.08847970832740766
0.07766705373165841
0.034232737881967554
0.033166354833863675
0.08883564693810382
Contributors:
No information available

Dataset column

Name:
light_august_ground
Definition:
relative light condition (PAR); Datagroup description: ground level each subplot, 5 measuring points were recorded and put in relation to a control value (measured at a height of above 2 m) in August 2010
Unit:
percent
Datagroup:
Solar radiation
Keywords:
solar radiation
Values:
0.01274094501718213
0.015639908307434593
0.007392476238844953
0.00878055478244735
0.0030185983039282575
Contributors:
No information available

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22 erfmeier medium

Alexandra
Erfmeier

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73 pohl medium

Ricarda
Pohl

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