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Title:
Main Experiment: Seedling addition experiment - growth and biomass data
Access rights:
Free for public
Usage rights:
No information available
Published:
No information available
Abstract:
While coexistence in plant communities is frequently explained by effects of resource niche partitioning, the Janzen-Connell (J-C) hypothesis is an alternative approach that has been assumed as a major ecological mechanism explaining high species richness levels, in particular, in tropical forest ecosystems. Central components of the J-C hypothesis are non-competitive effects of density- and distance-dependence, thereby two drivers that contribute independently to species coexistence, but that are ultimately linked in the field. Here, we make use of the forest Biodiversity-Ecosystem Functioning project in subtropical China (BEF-China) to estimate density and distance dependence effects by means of a reciprocal tree seedling transplant experiment. Using monocultures of ten and seven tree species, respectively planted at two different sites, juveniles of all species were grown in their own (home) and in all other monocultures (away), thereby testing for distance effect, just as in three different levels of planting density, testing for density effects. In addition, we repeated a similar set-up in a nearby common garden experiment, where we added a 'shadow' treatment to simulate different light conditions induced by the canopy layer. The general aim of the common garden experiment is to test for additional density dependent intraspecific competition for light in the absence of host-specific agents necessary for J-C effects. Density dependent patterns that are prevalent in the main experiment, while not being prevalent in the common garden experiment can be considered true J-C effects (see "Common Garden Experiment: Seedling addition experiment - growth and biomass data" for further details)
Design:
We implemented a reciprocal transplant experiment with juvenile plants using monocultures of 11 different tree species and following a home-away design, i.e. planting transplants in their own monoculture (home) and in a different one (away). The species represent a subset of the Main Experiment’s species pool and had been selected according to their representation at the two sites and finally included 6 evergreen and 5 deciduous species. From the species pool, 10 species were implemented at site A and 7 species at site B, thus 6 species were used on both sites. For each species, 3 monoculture plots were selected at each site and used for subplot implementation according to the project-specific experimental setup. The general design of BEF-China provides two ‘true’ replicates of each species’ monocultures at the plot level (i.e. where all 20 * 20 planted individuals belong to the same species). As a third replicate, we used 2-species mixtures including the respective target species and therein, all subplots were established in between four individuals of the target species. All site-specific target species were planted in suplots either established in their own monoculture (home: 3 replicates each) or in monocultures of the other species within site (away: 9 species * 3 replicates, i.e. 27 plots site A and 18 for site B, respectively). Three monocultures in total, (1 in site A and 2 in site B) could not be realised. This approach was used to test for distance dependence. In order to test for effects of density-dependence, each subplot, was then subdivided in split-plots where tree seedlings were planted in conspecific communities at different density levels of 4, 9 and 25 individuals each. Accordingly, in target plots at site A, each five subplots (hosting each two species) were implemented, whereas at site B, the number of subplots per plot was lower because of the lower number of species tested. Thus, in each 29 and 19 plots (for site A and B, respectively), 5 and 4 subplots (for site A and B, respectively) were randomly allocated with each subplot 1.5 m x 1.0 m in size. Each splitplots occupied an area of 0.5 x 0.5 m in size. Species × density combinations were randomly allocated within subplot.
Spatial extent:
Plots of the main experiment on Site A and B
Temporal extent:
No information available
Taxonomic extent:
No information available
Measurement cirumstances:
No information available
Data analysis:
No information available

Filter:
Dataset column

Name:
Samplenr
Definition:
An individual number for each taken sample
Unit:
No information available
Datagroup:
Helper
Keywords:
No information available
Values:
B38.1.1.1.0.A
B38.1.1.1.1.A
B38.1.1.1.2.A
B38.1.1.1.4.A
B38.1.1.1.3.A
Contributors:
No information available

Dataset column

Name:
Seedlingnr
Definition:
An individual number for each seedling
Unit:
No information available
Datagroup:
Helper
Keywords:
No information available
Values:
B38.1.1.5
B38.1.1.1
B38.1.1.4
B38.1.1.2
B38.1.1.3
Contributors:
No information available

Dataset column

Name:
Plot
Definition:
Plot
Unit:
No information available
Datagroup:
Helper
Keywords:
No information available
Values:
C37
F21
B38/C38
E24
E33
Contributors:
No information available

Dataset column

Name:
Subplot
Definition:
An individual number for each subplot
Unit:
No information available
Datagroup:
Helper
Keywords:
No information available
Values:
3
1
2
4
5
Contributors:
No information available

Dataset column

Name:
Splitplot
Definition:
An individual number for each splitplot
Unit:
No information available
Datagroup:
Helper
Keywords:
No information available
Values:
1
2
4
5
3
Contributors:
No information available

Dataset column

Name:
Indnr_Splitplot
Definition:
An individual number for each seedling within each splitplot
Unit:
No information available
Datagroup:
Helper
Keywords:
No information available
Values:
11
1
10
13
12
Contributors:
No information available

Dataset column

Name:
Record
Definition:
number for the records
Unit:
No information available
Datagroup:
Helper
Keywords:
No information available
Values:
4
3
2
1
0
Contributors:
No information available

Dataset column

Name:
Site
Definition:
Site
Unit:
No information available
Datagroup:
Experimental Site
Keywords:
No information available
Values:
B
A
Contributors:
No information available

Dataset column

Name:
PTAG
Definition:
PTAG
Unit:
No information available
Datagroup:
BEF research plot name
Keywords:
No information available
Values:
p105330
p103370
p105240
p102381
p106210
Contributors:
No information available

Dataset column

Name:
Date
Definition:
Month and year of record
Unit:
No information available
Datagroup:
Date time information
Keywords:
No information available
Values:
May_2015
June_2015
July_2015
March_2016
August_2015
Contributors:
No information available

Dataset column

Name:
Planted_Species
Definition:
Species planted. The scientific species fullnames are based on the "Flora of China". Scientific species names consist of epithet and genus.
Unit:
No information available
Datagroup:
Scientific plant species name
Keywords:
No information available
Values:
C.camphora
C.sclerophylla
D.glaucifolia
C.fargesii
C.glauca
Contributors:
No information available

Dataset column

Name:
Density
Definition:
Density of planted species within each splitplot
Unit:
No information available
Datagroup:
Seedling Density
Keywords:
No information available
Values:
25
9
4
Contributors:
No information available

Dataset column

Name:
Distance
Definition:
indicator for species either planted in their own monoculture (home) or in a different one (away)
Unit:
No information available
Datagroup:
Distance
Keywords:
No information available
Values:
Home
Away
Contributors:
No information available

Dataset column

Name:
Home_Species
Definition:
Species of the monoculture. The scientific species fullnames are based on the "Flora of China". Scientific species names consist of epithet and genus.
Unit:
No information available
Datagroup:
Scientific plant species name
Keywords:
No information available
Values:
C.sclerophylla
D.glaucifolia
C.camphora
L.formosana
C.glauca
Contributors:
No information available

Dataset column

Name:
Dead
Definition:
indicator for species dead (1) or alive (0)
Unit:
No information available
Datagroup:
Living status
Keywords:
No information available
Values:
0
1
Contributors:
No information available

Dataset column

Name:
Height_P
Definition:
Height of the seedling up to the last photosynthetically active tissue
Unit:
cm
Datagroup:
Plant height
Keywords:
No information available
Values:
10
102
100
0
101
Contributors:
No information available

Dataset column

Name:
Height_G
Definition:
Height of the seedling up to the last still living tissue
Unit:
cm
Datagroup:
Plant height
Keywords:
No information available
Values:
0.4
0.6
0.9
0.8
0.5
Contributors:
No information available

Dataset column

Name:
Leaves_Liv
Definition:
Number of living leaves
Unit:
No information available
Datagroup:
Plant leaf number
Keywords:
No information available
Values:
0
1
10
100
102
Contributors:
No information available

Dataset column

Name:
Leaves_Dam
Definition:
Number of damaged leaves
Unit:
No information available
Datagroup:
Plant leaf number
Keywords:
No information available
Values:
0
100
10
1
102
Contributors:
No information available

Dataset column

Name:
Leaves_Dead
Definition:
Number of dead leaves on seedling
Unit:
No information available
Datagroup:
Plant leaf number
Keywords:
No information available
Values:
1
10
0
12
11
Contributors:
No information available

Dataset column

Name:
Damage_pro
Definition:
estimated leave damage in percent
Unit:
in percent
Datagroup:
Herbivore damage
Keywords:
No information available
Values:
0
0.5
0.2
0.1
0.3
Contributors:
No information available

Dataset column

Name:
Biomass_Above
Definition:
aboveground dry matter biomass in Sep. 2016
Unit:
g
Datagroup:
Above and below ground biomass measurement
Keywords:
No information available
Values:
0.04
0.05
0.01
0.02
0.03
Contributors:
No information available

Dataset column

Name:
Biomass_Below
Definition:
belowground dry matter biomass in Sep. 2016
Unit:
No information available
Datagroup:
Above and below ground biomass measurement
Keywords:
No information available
Values:
0.04
0.03
0.05
0.01
0.02
Contributors:
No information available

Dataset column

Name:
LAI
Definition:
Leaf area index measured above the planted seedlings (1m height) in each subplot
Unit:
No information available
Datagroup:
Leaf Area Index (LAI)
Keywords:
No information available
Values:
0.001953125
0.002361707
0.011953125
0.008523142
0.008545297
Contributors:
No information available

Dataset column

Name:
Slope
Definition:
inclination of each subplot
Unit:
No information available
Datagroup:
Inclination
Keywords:
No information available
Values:
10
12
13
1
0
Contributors:
No information available

Dataset column

Name:
Northness
Definition:
Northness of the subplot
Unit:
No information available
Datagroup:
Aspect
Keywords:
No information available
Values:
-0.0220966192786839
0.0663068583517113
-0.0397907599311577
-0.0751360908983532
-0.0574724308476655
Contributors:
No information available

Dataset column

Name:
Comments
Definition:
if problems occurred, e.g. after the survival measurement (record = 0) nearly all dead seedlings have been replaced. Those not replaced have been marked
Unit:
No information available
Datagroup:
Comments
Keywords:
No information available
Values:
Animale_passed
Dead_in_October_2015
Animale_passed;not_replanted
landslide
Dead_in_October_2015;not_replanted
Contributors:
No information available

No information available


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140 germany medium

Markus
Germany

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22 erfmeier medium

Alexandra
Erfmeier

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