Main Experiment: Tree inventory Main experiment Site A 2011

Usage Rights

This data is Free for members.

Dataset Abstract

Individual-tree growth is a function of stand attributes, local neighbors, plant size, plant damage, genotype, and local abiotic site conditions. Given a certain time phase (combing further data along the timeline), the following scientific questions will be investigated: a) How does the within-plot individual-tree growth vary within and among species as a function of species richness? b) Wheather diversity reduces competition by quantifying local neighbour interactions in terms of growth rates and branch demography? c) What are the ecological importance of phenotypic plasticity of tree individuals in relation to competition, species richenss, and local terrain conditions? d) How the individual-tree growth is affected by soil feed-backs (mycorrhiza, pedogenetic processes,soil chemistry and nutrient cycle)? The overall objective with the data to be achieved is to test the hypothesis that the diversity effect at the plot level is the overall result of the diversity effects at the local neighbourhood level. This data as a basis can also be linked to other abiotic and biotic factors for investigating the interactions between the tree growth performance and abiotic and biotic factors. Measurement for this data took place in October 2010. Measurements were conducted in the central part (extended core area) of all 1mu-plots in site A. Extended core area is the central 6 * 6 trees in the monoculture and 2-species mixtures ( total 36 tree positions per 1mu-plot), the central 12 * 12 trees in the 4-,8-,16-,24-species mixtures (total 144 tree positions per 1 mu-plot). By applying the conventional measuring methods direct in the field, tree position, tree species, total height, stem diameter 5 cm above ground height (gd), the diameter at breast height (dbh), the distance up to the first branch, the distance up to the longest branch, the diameter, the length, the azimuth and the angle of the longest branch, the crown diameters (N-S and E-W) were measured and the number of branches were counted.

Dataset Design

The tree positions in the so called extended core area for each 1mu-plot were surveyed. The extended core area is the central 6 * 6 tree positions in the monocultres and 2-species mixtures (36 tree positions per 1mu-plot) and the central 12 * 12 tree positions in the 4-, 8-, 16- or 24- species mixtures (144 tree positions per 1mu-plot).

Spatial Extent

This data was collected from site A within the BEF-China experiment, which is located in a hilly subtropical region near Xingangshan Township, Jiangxi Province (29.08-29.11 N, 117.90- 117.93 E), China. The mean annual temperature is 16.7 celsius degrees and the mean annual average precipitation 1821 mm. The natural vegetation of this region is subtropical broad-leaved forest with dominance in abundance of evergreen species (Bruelheide et al. 2011). Site A was planted in 2009 and covers a total area of 26.6 ha, ranging in altitude from 105 to 275 m. The relief is highly variable with slopes ranging from 0 to 45 degrees. The soils are Cambisols and Cambisol derivatives, interfered by Regosols on ridges and crests, and Anthrosols from colluvial deposits on foot slopes and valley floors. Due to the mountainous topography, erosion is a typical feature resulting a mixing of parent material and soil components from crest to valley positions.

Taxonomic Extent

Castanea henryi
Pinus massoniana
Schima superba
Choerospondia axillaris
Liquidambar formosana
Quercus serrata
Cyclobalanopsis myrsinifolia
Castanopsis carlesii
Cyclobalanopsis glauca
Lithocarpus glaber
Castanopsis eyrei
Castanopsis sclerophylla
Diospyros japonica
Daphniphyllus oldhamii
Cinnamomum camphora
Koelreuteria bipinnata
Sapindus mukorossi
Nyssa sinensis
Triadica sebifera
Triadica cochinchinensis
Rhus chinensis
Quercus fabri
Quercus acutissima
Melia azedarach
Acer davidii
Cunninghamia lanceolata
Castanopsis fargesii

Measurement Circumstances

The measurements were conducted after the weeding in autumn and before the deciduous trees leaved off. Choosing this season is because a) weeded plots shorten the time consumed for identifying the tree positions; b) during this period, trees reach their highest height for this growing season (Pilot Experiment approved, unpublished data); c) Leaf-on gives a more accurate estimation on crown diameter.

Paper proposal submissions

Published

2013

Data columns available in the raw data part of this dataset

TAG
code for planting locations, 12 digits with "t" in front; Datagroup description: Tree or shrub tags consist of 12 digits: The first 6 are the site plot name: _1_ site _2/3_ row, counting from North _4/5_ column, counting from west _6_ is the plot moved? Is it a quarter plot? The next 6 digits describe the tree individual _7/8_ type of individual (01 planned tree, 02 other tree than planted but in a given plot somewhere, 03 planned shrub, 04 other shrub within this plot) _9/10_ x grid position within plot, starting from southwest northwards _11/12 y grid position, starting from southwest eastwards.
Data group: t or s TAG Main Experiment
Keywords: tree individual, location, object
Values
t102340010404
t102340010408
t102340010405
t102340010406
t102340010407
PLOT_NO
plot name
Data group: Plot name Main experiment (letter, number code)
Keywords: plot
Values
B36/C36
B38/C38
B34
C31
B35
PTAG
plot code, BEF research plot name, 6 digits with "p" in front; Datagroup description: Research plots of the Biodiversity - Ecosystem functioning experiment (BEF-China). Main Experiment plots have a size of 1 mu, which is about 25x25m^2 in horizontal projection. Pilot Study Plots have a size of 1x1 m^2. 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 B. 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: Main Experiment, Site A
Values
p102350
p103310
p102361
p102340
p102381
position
position within the respective plot given in XXYY
Data group: Individual position within plot in Site A or B (given by SP1/SP2)
Keywords: Main Experiment, individual position
Values
1006
1005
1007
1004
1003
id
the SP2 grid position
Data group: IdTree SP2
Values
id10.10
id10.11
id10.10.
id10.13
id10.12
spp.code2011
spp.code2011
Data group: Species codes (Species numbers in the Main experiment)
Values
13
1
10
11
12
spp.code.n2011
the species code surveyed in 2011
Data group: Species codes (Species numbers in the Main experiment)
Keywords: plant species
Values
11
10
13
1
12
spp2011
the species name surveyed in 2011
Data group: Scientific plant species name
Keywords: species
Values
Castanea henryi
Castanopsis eyrei
Castanopsis carlesii
Castanopsis fargesii
Acer davidii
height2011
the total tree height; Datagroup description: Total height was measured as the length from stem base to the apical meristem.; Instrumentation: linear tape
Unit: centimeter
Data group: Plant height
Keywords: response variable, height
Values
100
103
102
10
101
gd2011
the stem ground diameter ( 5 cm aboveground ); Datagroup description: Stem diameter at 5 cm above ground was measured; Instrumentation: caliper
Unit: centimeter
Data group: Basal diameter
Keywords: response variable, basal diameter
Values
0.15
0.05
0.1
0.08
0.11
h1st2011
the distance up to the first living branch, for branchless trees, the distance up to the first living leaf was recorded; Instrumentation: linear tape
Unit: centimeter
Data group: Bifurcation point
Keywords: bifurcation point, crown architecture
Values
0
100
10
1
0.5
llong2011
the length of the longest branch; Instrumentation: linear tape
Unit: centimeter
Data group: Branch demography
Keywords: response variable, branch
Values
1
10
0
100
0.2
hlong2011
the distance up to the longest branch; Instrumentation: linear tape
Unit: centimeter
Data group: Branch demography
Keywords: branch
Values
0
100
0.5
10
1
azlong2011
the azimuth of the longest branch; Instrumentation: compass
Unit: degree
Data group: Branch demography
Keywords: response variable, branch
Values
1
0.9
100
10
0
anlong2011
the elevation angle of the longest branch; Instrumentation: angle finder
Unit: degree
Data group: Branch demography
Keywords: response variable, branch
Values
0.7
0.5
0.6
0.1
0
dlong2011
the diameter for the longest branch ( 1cm from stem ); Instrumentation: caliper
Unit: centimeter
Data group: Branch demography
Keywords: response variable, branch
Values
0.1
0
0.05
0.15
0.12
dbh2011
the diameter at breast height ( 130 cm aboveground ); Instrumentation: caliper
Unit: centimeter
Data group: Diameter at breast height
Keywords: response variable, dbh
Values
0.6
0.7
0.5
0.8
0.4
cbh2011
the crown base height; Instrumentation: linear tape
Unit: centimeter
Data group: Crown architecture
Keywords: response variable, crown
Values
114
130
134
110
123
ns.crown2011
the crown diameter along N-S cardinal direction
Unit: centimeter
Data group: Crown architectural parameters
Keywords: crown architecture
Values
10
101
1
100
0
ew.crown2011
the crown diameter along E-W cardinal direction
Unit: centimeter
Data group: Crown architectural parameters
Keywords: crown architecture
Values
10
101
100
0
1
nbranch2011
the number of branches (taking account of branches longer than 1 cm)
Data group: Branch demography
Keywords: response variable, branch
Values
0
112
10
11
1
nd.branch2011
the number of dead branches
Data group: Branch demography
Keywords: response variable, branch
Values
10
0
12
11
1
date
the survey date
Data group: Date time information
Keywords: date
Values
d04102011
d03102011
d06102011
d02102011
d01112011
comment2011
comments
Data group: Comments
Values
actual 14.5
actual 11.5
2stems
1
actual3.14