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Title:
Main Experiment: Tree size in the Main Experiment - Site A 2009-2012 & site B 2010-2012
Access rights:
Free within projects
Usage rights:
No information available
Published:
The data has not yet been used for publications.
Abstract:
Several field studies have shown the positive effect of diversity on primary productivity in grasslands. However, little is known about forest ecosystems, the most productive vegetation type on Earth and responsible for more than 50 % of global net primary productivity (NPP). In this project, we will investigate the relationship between tree diversity (species richness, identity, composition, and functional diversity) and the aboveground biomass production during the initial development of forest communities in the Main Experiment. Basal diameter (BD), diameter at breast height (DBH) and height were measured to estimate the size of the 4x4 central tree individuals (8256 individuals, in total) distributed in 516 plots under 6 different diversity levels (from 1 to 24 species per plot) in the Main Experiment (Xingangshan). The annual inventories started in 2009 in site A and 2010 in site B.
Design:
We measured the central 4x4 tree individuals of all plots in late summer/early autumn of 2009-2012. Position, presence/absence, species, basal diameter, diameter at breast height, and height were recorded. Trees were marked with small white plastic labels at the beginning of the experiment and its growth was monitor during the following years.
Spatial extent:
The Main Experiment consists of two sites (A & B) located near to the village Xingangshan in Dexing County, Jiangxi province. Each site covers 256 1-mu plots (after excluding all plots from the F and G scenarios and all plots with 0- tree species richness). Each plot comprises 400 trees (planted as 20x20 grid).
Temporal extent:
A census was conducted every year in late summer/early autumn of 2009-2012.
Taxonomic extent:
The central 4x4 tree individuals of all plots in site A& B (after excluding all plots from the F and G scenarios and all plots with 0- tree species richness)
Measurement cirumstances:
Note that only in 2012 the metal labels were attached to the trees. Before that year, there were no permanent labels and some labels (from SP1/SP2) fall off. This led to some mistakes and some tree species don't match among years. This data is still being checked.
Data analysis:
The data will be used to estimate the stand basal area and biomass in order to test the effects of diversity on primary production.

Filter:
Dataset column

Name:
site
Definition:
site within the Main Experiment
Unit:
id
Datagroup:
Experimental Site
Keywords:
Site A, Site B
Values:
B
A
Contributors:
No information available

Dataset column

Name:
PTAG
Definition:
Plot ID across CSP, MainA & MainB. See BEF-database for further details.
Unit:
id
Datagroup:
PTAG
Keywords:
Main Experiment, Site A, Site B
Values:
p102340
p102361
p102381
p102350
p103310
Contributors:
No information available

Dataset column

Name:
PLOT_NO
Definition:
Name of each plot, coded with letters and numbers in Site A & B. See BEF-database for further details.
Unit:
id
Datagroup:
Plot name Main experiment (letter, number code)
Keywords:
Main Experiment, Site A, Site B
Values:
C27
B35
B36/C36
B38/C38
B34
Contributors:
No information available

Dataset column

Name:
IdTree
Definition:
ID code for each measured tree by SP1/SP2.
Unit:
No information available
Datagroup:
IdTree SP2
Keywords:
BEF China PIs, tree, Main Experiment
Values:
id10.10
id10.12
id10.14
id10.11
id10.13
Contributors:
No information available

Dataset column

Name:
year
Definition:
year of the inventory
Unit:
year
Datagroup:
Date time information
Keywords:
No information available
Values:
2012
2009
2011
2010
Contributors:
No information available

Dataset column

Name:
PosTag
Definition:
The last four digits of the tree position tag in the main experiment; specified as posXXYY
Unit:
No information available
Datagroup:
Position within Main experiment plots
Keywords:
Main Experiment, tree position tag
Values:
pos0610
pos0608
pos0611
pos0609
pos0607
Contributors:
No information available

Dataset column

Name:
alive
Definition:
living status of the tree during the inventory (alive or dead)
Unit:
No information available
Datagroup:
Living status
Keywords:
No information available
Values:
1
0
Contributors:
No information available

Dataset column

Name:
sp
Definition:
species name of the individual; Datagroup description: Scientific plant species name
Unit:
id
Datagroup:
Scientific plant species name
Keywords:
species
Values:
Castanea henryi
Alniphyllum fortunei
Acer davidii
Betula luminifera
Ailanthus altissima
Contributors:
No information available

Dataset column

Name:
height
Definition:
height of the tree; Datagroup description: height; Source: Ying Li, Goddert von Oheimb, Werner Härdtle, Anne Lang
Unit:
cm
Datagroup:
Plant height
Keywords:
height, Main Experiment
Values:
100
0
101
1
10

Dataset column

Name:
bd
Definition:
measured basal diameter of the individual; Datagroup description: basal diameter; Instrumentation: measured with a calliper (derived from datagroup); Source: These persons could not be matched within the portal: Ying Li, Goddert von Oheimb, Werner Härdtle, Anne Lang
Unit:
centimeter
Datagroup:
Basal diameter
Keywords:
basal diameter
Values:
0
0.01
0.02
0.04
0.03
Contributors:
These persons could not be matched within the portal: Ying Li, Goddert von Oheimb, Werner Härdtle, Anne Lang

Dataset column

Name:
dbh
Definition:
measured diameter at breast height of the individual; Datagroup description: Diameter at breast height
Unit:
centimeter
Datagroup:
Diameter at breast height
Keywords:
dbh
Values:
0.6
0.3
0.5
0.4
0.1
Contributors:
No information available

Dataset column

Name:
comments
Definition:
comments
Unit:
No information available
Datagroup:
Comments
Keywords:
No information available
Values:
no br
cut
missing
cut weeding
IDTree was missing in the field datasheet
Contributors:
No information available

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