Main Experiment: Tree size in the Main Experiment - Site A 2009-2012 & site B 2010-2012

Usage Rights

This data is Free within projects.

Dataset 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.

Dataset 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).

Published

The data has not yet been used for publications.

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 Circumstances

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.

Data columns available in the raw data part of this dataset

site
site within the Main Experiment
Unit: id
Data group: Experimental Site
Keywords: Site A, Site B
Values
A
B
PTAG
Plot ID across CSP, MainA & MainB. See BEF-database for further details.
Unit: id
Data group: PTAG
Keywords: Main Experiment, Site A, Site B
Values
p103310
p102381
p102340
p102350
p102361
PLOT_NO
Name of each plot, coded with letters and numbers in Site A & B. See BEF-database for further details.
Unit: id
Data group: Plot name Main experiment (letter, number code)
Keywords: Main Experiment, Site A, Site B
Values
C27
B35
B36/C36
B34
B38/C38
IdTree
ID code for each measured tree by SP1/SP2.
Data group: IdTree SP2
Keywords: BEF China PIs, tree, Main Experiment
Values
id10.12
id10.14
id10.13
id10.10
id10.11
year
year of the inventory
Unit: year
Data group: Date time information
Values
2012
2010
2009
2011
PosTag
The last four digits of the tree position tag in the main experiment; specified as posXXYY
Data group: Position within Main experiment plots
Keywords: Main Experiment, tree position tag
Values
pos0610
pos0608
pos0611
pos0609
pos0607
alive
living status of the tree during the inventory (alive or dead)
Data group: Living status
Values
1
0
sp
species name of the individual; Datagroup description: Scientific plant species name
Unit: id
Data group: Scientific plant species name
Keywords: species
Values
Alniphyllum fortunei
Betula luminifera
Castanea henryi
Ailanthus altissima
Acer davidii
height
height of the tree; Datagroup description: height; Source: Ying Li, Goddert von Oheimb, Werner Härdtle, Anne Lang
Unit: cm
Data group: Plant height
Keywords: height, Main Experiment
Values
100
101
10
0
1
* Lang, A., Härdtle, W., von Oheimb, G., Li, Y. also contributed to this column.
bd
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
Data group: Basal diameter
Keywords: basal diameter
Values
0.01
0.02
0.03
0.04
0
* These persons could not be matched within the portal: Ying Li, Goddert von Oheimb, Werner Härdtle, Anne Lang also contributed to this column.
dbh
measured diameter at breast height of the individual; Datagroup description: Diameter at breast height
Unit: centimeter
Data group: Diameter at breast height
Keywords: dbh
Values
0.6
0.4
0.5
0.1
0.3
comments
comments
Data group: Comments
Values
missing
IDTree was missing in the field datasheet
no br
cut
cut weeding