Main Experiment: Removal experiment - harvest response variables 2012 (VIPs)

Usage Rights

This data is Free within projects.

BEF-China: SP11 internal

Dataset Abstract

SP 11 studied the interaction between tree layer diversity and herb layer diversity in highly diverse subtropical forests. Apart from species richness alone, a high functional diversity of resident communities influences ecosystem functioning. Effects of functional group losses in herb layer communities of the Main Experiment were studied by species removal. Removing species or functional groups allows studying within-community (biomass) compensation and effects on the tree individuals. We applied a functional group removal experiment in the Main experiment in which most dominant functional groups (herbs, grasses, ferns and woody weeds) were experimentally removed by selective weeding. By comparing the removal subplots with control plots containing the entire suite of species, we assess the role of functional groups for herb layer feedback effects on young trees and for evaluating community responses to such a loss at the same time.

Dataset Design

The removal experiment was established on Site A and B in June 2011 and was conducted within each 32 plots on Site A and on Site B, thus representing the full tree diversity gradient of the Main Experiment, including the tree diversity levels one (n = 16), two (n = 8), four (n = 4) eight (n = 2), 16 (n =1) and 24 (n = 1) at both sites. Within the northern four rows of each plot, five subplots (5 m × 5 m) containing each 16 trees, were established in June 2011 and randomly assigned to one of five removal treatments. Thus, the removal experiment was based on a total of 320 (2 × 32 × 5) subplots. Five levels of removal treatments were applied, i.e. woody species (W), fern species (F), grass species (G) and herbaceous species (H) were removed. One additional subplot served as a control without removal. The initial removal weeding was carried out in June 2011, where the aboveground biomass of each function group was entirely removed by selective cutting. Additional weeding took place in 2012, in June and September each, and in June 2013. The dry weight of the removed aboveground biomass was determined subsequent to the weeding campaigns. In August 2012, a vegetati+A30on monitoring was conducted for all 320 subplots. In September 2012, a subsample of each subplot was harvested for productivity assessment. In VIPs of 1- and 2-species mixtures, the total aboveground biomass was harvested within each of the removal subplots as a pooled sample of three 0.5 m × 0.5 m replicates and separated by functional group: fern, grass, woody species and herbs. In VIPs of 4-, 8- 16- and 24-species mixtures, five replicates were harvested and pooled by subplot.

Spatial Extent

Main experiment, Site A, Site B, no shrub VIPs

Temporal Extent

Initial weeding of removal treatments was performed in June 2011

Data Analysis

For each subplot, the coverage, maximum and mean height of each functional group is given; for details see data group description.

Data columns available in the raw data part of this dataset

PTAG
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.
Data group: BEF research plot name
Keywords: VIP plots
Values
p105330
p106210
p105340
p103320
p105310
Plot
Plotnumber on Site A and B; 32 VIP plots with no shrub treatment;
Data group: Helper
Keywords: plot
Values
E34
D29
E31
E33
C32
treatment
removal treatment: c= control, without removal; W= removal of woody species; F = removal of fern species; H= removal of herbaceous species; G= removal of grass species
Data group: Treatment
Keywords: experimental treatment, removal experiment
Values
w
c
h
g
f
tree_diversity
tree diversity
Data group: Taxonomic biodiversity
Keywords: Diversity level
Values
4
24
2
16
1
Site
Site on Main experiment; Datagroup description: Site A or B
Data group: Helper
Keywords: Site A, Site B
Values
A
B
date
date; Datagroup description: mean date for the monitoring campaign, monitoring started 2012-08-04 and was finished 2012-08-28
Data group: Date time information
Keywords: date
Values
2010-08-12
cover_w
cover of woody species by subplot
Unit: percent
Data group: Cover of species
Keywords: vegetation cover, woody species
Values
0
15
14
16
10
cover_g
cover of grass species by subplot; Datagroup description: cover of grass species by subplot
Unit: percent
Data group: Cover of species
Keywords: vegetation cover, grass species
Values
10
0
1
15
14
cover_f
cover of fern species by subplot; Datagroup description: cover of fern species by subplot
Unit: percent
Data group: Cover of species
Keywords: vegetation cover, fern species
Values
12
15
10
0
1
cover_h
cover of herbaceous species by subplot; Datagroup description: cover of herbaceous species by subplot
Unit: percent
Data group: Cover of species
Keywords: herbs, vegetation cover
Values
10
15
1
0
2
cover_total
cover total by subplot; Datagroup description: cover total by subplot
Unit: percent
Data group: Cover of species
Keywords: vegetation cover
Values
101
0
105
100
131
maxheight_w
maximum height of woody species by subplot; Datagroup description: maximum height of woody species by subplot; Instrumentation: ruler
Unit: centimeter
Data group: Plant height
Keywords: total height, woody species
Values
0
0.55
0.45
0.5
0.56
maxheight_g
maximum height of of grass species by subplot; Datagroup description: maximum height of of grass species by subplot; Instrumentation: ruler
Unit: centimeter
Data group: Plant height
Keywords: crown height, grass species
Values
0.3
0
0.2
0.36
0.19
maxheight_f
maximum height of fern species by subplot; Datagroup description: maximum height of fern species by subplot; Instrumentation: ruler
Unit: centimeter
Data group: Plant height
Keywords: crown height, fern species
Values
0.05
0.1
0
0.2
0.15
maxheight_h
maximum height of herbaceous species by subplot; Datagroup description: maximum height of herbaceous species by subplot; Instrumentation: ruler
Unit: centimeter
Data group: Plant height
Keywords: herbs, height
Values
0.05
0.03
0.02
0.01
0
mheight_w
mean height of woody species by subplot; Datagroup description: mean height of woody species by subplot; Instrumentation: ruler
Unit: centimeter
Data group: Plant height
Keywords: crown height, woody species
Values
0
0.26
0.3
0.35
0.2
mheight_g
mean height of of grass species by subplot; Datagroup description: mean height of of grass species by subplot; Instrumentation: ruler
Unit: centimeter
Data group: Plant height
Keywords: height, grass species
Values
0.23
0
0.15
0.1
0.2
mheight_f
mean height of fern species by subplot; Datagroup description: mean height of fern species by subplot; Instrumentation: ruler
Unit: centimeter
Data group: Plant height
Keywords: height, fern species
Values
0.05
0
0.12
0.1
0.15
mheight_h
mean height of herbaceous species by subplot; Datagroup description: mean height of herbaceous species by subplot; Instrumentation: ruler
Unit: centimeter
Data group: Plant height
Keywords: herbs, height
Values
0.01
0.02
0.03
0
0.04
BMW_total
aboveground biomass of woody species by subplot (25 m2)
Unit: gram
Data group: Above and below ground biomass measurement
Keywords: aboveground biomass, woody species
Values
1022.56
10.4052
1038.96
1022.9779
103.56
BMG_total
aboveground biomass of grass species by subplot (25 m2); Datagroup description: aboveground biomass of grass species by subplot (25 m2)
Unit: gram
Data group: Above and below ground biomass measurement
Keywords: aboveground biomass, grass species
Values
102.2511
0.8671
1020.3766
1029.0476
1000.9669
BMF_total
aboveground biomass of fern species by subplot (25 m2); Datagroup description: aboveground biomass of fern species by subplot (25 m2)
Unit: gram
Data group: Above and below ground biomass measurement
Keywords: aboveground biomass, fern species
Values
1010.9719
0.1334
100.4502
1017.7086
1011.3721
BMH_total
aboveground biomass of herbaceous species by subplot (25 m2); Datagroup description: aboveground biomass of herbaceous species by subplot (25 m2)
Unit: gram
Data group: Above and below ground biomass measurement
Keywords: herbs, aboveground biomass
Values
100.8504
101.52
101.6508
0
10.1384
BM_total_total
aboveground biomass total by subplot (25 m2); Datagroup description: aboveground biomass total by subplot (25 m2)
Unit: gram
Data group: Above and below ground biomass measurement
Keywords: aboveground biomass
Values
1010.3716
1007.17
1000.4
0
1005.7026
BMW_total_m2
BMW_total_m2 aboveground biomass of woody species per m2
Data group: Above and below ground biomass measurement
Keywords: aboveground biomass, woody species
Values
10.021008
0.416208
0.864432
0.45356
0.4669
BMG_total_m2
BMG_total_m2 aboveground biomass of grass species per m2
Data group: Above and below ground biomass measurement
Keywords: aboveground biomass, grass species
Values
0.034684
0.357512
0.122728
0.229448
0.0416
BMF_total_m2
BMF_total_m2 aboveground biomass of fern species per m2
Data group: Above and below ground biomass measurement
Keywords: aboveground biomass, fern species
Values
0.005336
0.514924
0.365516
0.565616
0.482908
BMH_total_m2
BMH_total_m2 aboveground biomass of herbaceous species per m2
Data group: Above and below ground biomass measurement
Keywords: herbs, aboveground biomass
Values
0.09338
0.101384
0
0.205436
0.189428
BM_total_total_m2
BM_total_total_m2
Data group: Above and below ground biomass measurement
Keywords: aboveground biomass
Values
100.901092
100.82372
100.260772
101.629456
0
species_richness
species richness; Datagroup description: total species richness of each subplot
Data group: Taxonomic biodiversity
Keywords: response variable, species diversity
Values
11
15
13
12
14
RGR_d
RGR_d relative growth rate of the mean diameter of the 16 trees by subplot for the time period 2011-09-2012-10
Data group: Relative growth rate
Keywords: growth
Values
0.001037547
0
-0.002825129
0.000925216
0.003081236
RGR_height
RGR relative growth rate of the mean height of the 16 trees by subplot for the time period 2011-09-2012-10
Unit: centimeterPerMonth
Data group: Relative growth rate
Keywords: growth, height
Values
0.096596566
0.006175664
0.049785386
0.0798559
0.099305737