Main Experiment: Tree inventory Main experiment Site B 2013

Usage Rights

This data is Free for members.

Dataset Abstract

This data documents the tree growth parameters in 2013 for site B, belonging to the annual inventory taking place for both site A and site B. 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 B 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 B was planted in 2010 and covers a total area of 26.6 ha, ranging in altitude from 105 to 190 m.

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.

Data Analysis

Castanopsis sclerophylla
Cyclobalanopsis glauca
Castanopsis eyrei
Lithocarpus glaber
Schima superba
Cinnamomum camphora
Daphniphyllum oldhamii
Diospyros japonica
Betula luminifera
Castanopsis fargesii
Celtis biondii
Elaeocarpus japonicus
Michilus grijsii
Machilus leptophylla
Manglietia fordiana
Quercus phillyreoides
Alanthus altissima
Alniphyllum fortunei
Elaeocarpus chinensis
Elaeocarpus glabripetalus
Idesia omeiensis
Machilus thunbergii
Meliosma flexuosa
Phoebe bournei

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
t203270010404
t203270010406
t203270010405
t203270010407
t203270010408
plot
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
p205240
p204260
p203270
p204270
p204250
id_2013
the grid position of the individual according to SP2 label
Data group: IdTree SP2
Values
id0405
id0407
id0408
id0404
id0406
barcodePos
the grid position of the individual according to Z1/Z2 label
Data group: Individual position within plot in Site A or B (given by SP1/SP2)
Values
pos0203
pos0066
pos0002
pos0000
pos0204
sppcode
the species code surveyed in 2011
Data group: Species codes (Species numbers in the Main experiment)
Values
14
15
12
13
11
height_2013
the total tree height; Instrumentation: linear tape
Unit: centimeter
Data group: Plant height
Keywords: height, response variable
Values
10
1
101
100
102
cbh_2013
the crown base height; Instrumentation: linear tape
Unit: centimeter
Data group: Crown architecture
Keywords: crown. Crown architecture
Values
1
101
0
100
10
llong_2013
the length of the longest branch
Unit: centimeter
Data group: Crown architectural parameters
Keywords: branch, crown, crown architecture
Values
100
102
101
1
10
hlong_2013
the height of the longest branch
Unit: centimeter
Data group: Crown architectural parameters
Keywords: branch, crown, crown architecture
Values
1
101
0
100
10
anlong_2013
the angle of the longest branch
Unit: degrees
Data group: Branch demography
Keywords: branch, crown, crown architecture
Values
0
17
20
15
10
azlong_2013
the azimuth of the longest branch
Unit: degrees
Data group: Branch demography
Keywords: branch, crown, crown architecture
Values
1
0
10
100
105
dlong_2013
the diameter of the longest branch
Unit: centimeter
Data group: Branch demography
Keywords: branch, crown architecture
Values
0.4
0.2
0.3
0.1
0
gdew_2013
the stem diameter at 5 cm aboveground, measured along the E-W direction
Unit: centimeter
Data group: Basal diameter
Keywords: basal diameter, response variable
Values
0.3
0.5
0.2
0.1
0.4
gdns_2013
the stem diameter at 5 cm aboveground, measured along the N-S direction
Unit: centimeter
Data group: Basal diameter
Keywords: basal diameter, response variable
Values
0.1
0.3
0.2
0
0.4
dbh1_2013
the diameter at breast height ( 130 cm aboveground )
Unit: centimeter
Data group: Diameter at breast height
Keywords: dbh, response variable
Values
0.5
0.3
0.6
0.4
0.2
dbh2_2013
the diameter at breast height ( 130 cm aboveground ) provided by multistems
Unit: centimeter
Data group: Diameter at breast height
Keywords: branch, response variable
Values
0.4
0.6
0.5
0.3
0.7
EW_2013
the crown diameter measured along the E-W direction
Unit: centimeter
Data group: Crown architectural parameters
Keywords: crown architecture
Values
101
0
10
1
100
NS_2013
the crown diameter measured along the N-S direction
Unit: centimeter
Data group: Crown architectural parameters
Keywords: crown architecture
Values
0
10
1
101
100
BrDead_2013
number of dead branches
Data group: Branch demography
Keywords: branch, response variable
Values
10
1
12
0
11
BrAlive_2013
number of living branches
Data group: Branch demography
Keywords: branch, response variable
Values
100
101
1
0
10
broken_2013
1/0, inidcating if tree stem was broken or not
Data group: Helper
Keywords: tree, census, dead
Values
0
NA
1
4
7
team
census team
Data group: Helper
Keywords: census
Values
t10
t1
t3
t2
t11
Date
Date of census (d/dd/mm/yyyy)
Data group: Date time information
Keywords: date
Values
d04102013
d02102013
d06102013
d05102013
d03102013
comment_2013
comments on the respective tree individual
Data group: Helper
Values
a not-planted tree on this position
a not-planted tree
another spp14 on the same position might be measured in the previous years
extra for matching the tree individual from year2012
a not-planted tree 3 on this position
match1312
logical; indicating wether the respective tree could be matched with the same individual measured in 2012
Data group: Helper
Keywords: census, match
Values
n
y
gd_mean_2013
the mean stem diameter at 5 cm aboveground, calcualted based on gdew and gdns
Unit: square centimeters
Data group: Basal diameter
Keywords: basal diameter
Values
0.25
0.3
0.2
0.15
0.1