Main Experiment: Shrub inventory Main Experiment Site B 2012

Usage Rights

This data is Free for members.

Dataset Abstract

This data documents the shrub growth parameters in 2012 for site B, belonging to the annual inventory taking place for both site A and site B. Individual-shrub 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-shrub 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 shrub individuals in relation to competition, species richenss, and local terrain conditions? d) How the individual-shrub 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 shrub growth performance and abiotic and biotic factors. Measurement for this data took place from the end of September 2011 to the beginning of October 2011. Measurements were conducted in the central part (extended core area) of all 1mu-plots in site A. Extended core area is the central 5 * 5 shrubs in the monoculture and 2-species mixtures ( total 35 shrub positions per 1mu-plot), the central 11 * 11 shrubs in the 4-,8-,16-,24-species mixtures (total 121 shrub positions per 1 mu-plot). By applying the conventional measuring methods direct in the field, shrub position, shrub species, total height, the crown diameters (in N-S and E-W cardinal directions), the length and the diameter of the tallest ramet / branch were measured and the number of ramets /branches and the number of the first-order branches were counted.

Dataset Design

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). Shrubs in site B were planted in 2011 and covers a total area of 26.6 ha, ranging in altitude from 105 to 190 m.

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 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

Distylium buxifolium
Syzygium buxifolium
Ficus erecta
Hydrangea chinensis
Itea omeiensis
Photinia hirsuta
Phyllanthus glaucus
Rhododendron ovatum
Rhododendron simsii
Viburnum setigerum

Measurement Circumstances

The measurements were conducted after the weeding in autumn and before the deciduous plants leaved off. Choosing this season is because a) weeded plots shorten the time consumed for identifying the plant positions; b) during this period, plants 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 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: shrub individual, location, object
Values
t204280020406
t204280020405
t204280020407
t204280020408
t204280020404
PTAG
plot code, BEF research plot name, 6 digits with "p" in front; 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: Site B, location
Values
p205290
p205270
p205260
p204280
p205280
id2012
the shrub grid position within the plot
Data group: Helper
Values
id0407
id0404
id0408
id0405
id0406
spp.code2012
the species code surveyed in 2012
Data group: Species codes (Species numbers in the Main experiment)
Values
14
12
13*
13
11
spp2012
the species name surveyed in 2011
Data group: Scientific plant species name
Keywords: species
Values
Distylium buxifolium
Itea chinensis
Hydrangea chinensis
Ficus erecta
Distylium myricoides
height2012
the total shrub height; Instrumentation: linear tape
Unit: centimeter
Data group: Plant height
Keywords: response variable, height
Values
10
101
102
103
100
ns.crown2012
the crown diameter in NS cardinal direction
Unit: centimeter
Data group: Crown architectural parameters
Keywords: crown architecture
Values
10
1
100
0
108
ew.crown2012
the crown diameter in EW cardinal direction
Unit: centimeter
Data group: Crown architectural parameters
Keywords: crown architecture
Values
104
10
100
1
0
dTall2012
the diameter of the tallest ramet / branch ( 5 cm above ground for ramets / with a distance of 1 cm from the stem for branches)
Unit: centimeter
Data group: Branch demography
Keywords: branch
Values
0.2
0.1
0
0.3
0.4
nRamets2012
the number of stems (i.e. ramets)
Data group: Branch demography
Keywords: branch
Values
4
1
2
3
0
group
the measuring team
Data group: Helper
Values
g04
g05
g01
g03
g02
date
the survey date
Data group: Date time information
Keywords: date
Values
2012-10-04
2012-10-07
2012-10-03
2012-10-06
2012-10-05
comment
comment
Data group: Comments
Values
cut
no br, no leaf
no br. No leaf
a tree, not a shrub