Main Experiment: Wood stubs of Site A and B: quantity, density, position and decomposition class

Usage Rights

This data is Free within projects.

members of the project

Dataset Abstract

The measurements for this piece of data were taken between 2012.08.28 and 2012.11.15. Measured was every piece of wood (most of the times that had been tree stubs) which scope had been bigger than 14 cm in a sub plot in all VIP on both sites. The sub plot was defined as the inner square that is stretched by the planted trees of positions: 06:06, 06:14, 14:06 and 14:14,which is approximately a square with a side length of 10.4 meters. Every piece of wood was categorised into one of 6 DC (decomposition classes). Also the size of the wood had been measured. The position of the wood had been noted, as a position in a coordination system which was stretched by the trees. Besides I noted the species of the stub if possible. Most of the times this was easy because most of the trees had been either Pinus massoniana or Cunninghamia lanceolata. In case the tree stub re sprouted I took samples of the leaves to determine the species later. Further other variables had been noted e.g. fungi bodies present/ absent. Roughly half of the data had been taking by Chinese workers.
Also for every DC two wood samples (one with a scope over 63 cm and one witch a scope under 63 cm) had been taken, if these DC with the sizes existed. A hole was drilled with the length of the radius of the stub. The actual depth of the hole was measured. The saw dust was collected and dried at 60 degree celsius. With the weight and the calculated volume of the hole the wood density was measured.
The measurements were taken to match topographic and biotic parameters to decomposition classes. Furthermore, with the data it is possible to get an approximation of the amount of wood that had been left over after exploitation. Also it was intended to repeat the measurements to obtain chronological coarse woody debris (CWD) decomposition approximations for the experimental study sites.

Dataset Design

Measured was every piece of wood (most of the times that had been tree stubs) which scope had been bigger than 14 cm in a sub plot in all VIP on both sites. The sub plot was defined as the inner square that is stretched by the planted trees of positions: 06:06, 06:14, 14:06 and 14:14,which is approximately a square with a side length of 10.4 meters.
Also for every DC two wood samples (one with a scope over 63 cm and one witch a scope under 63 cm) had been taken, if these DC with the sizes existed. For sampling always the first stub that did accure on the plot were chosen.

Spatial Extent

Main Experiment Site A&B
29°08'-29°11'N
117°90'-117°93'E
Measured was every piece of wood (most of the times that had been tree stubs) which scope had been bigger than 14 cm in a sub plot in all VIP on both sites A and B.
The sub plot was defined as the inner square that is stretched by the planted trees of positions: 06:06, 06:14, 14:06 and 14:14,which is approximately a square with a side length of 10.4 meters.
Also for every DC two wood samples (one with a scope over 63 cm and one witch a scope under 63 cm) had been taken, if these DC with the sizes existed. A hole was drilled with the length of the radius of the stub. The actual depth of the hole was measured.
The saw dust was collected and dried at 60 degree celsius. With the weight and the calculated volume of the hole the wood density was measured in two ways.
The Density was measured in to ways in the assumption that the hole is shaped like a conus or as a cylinder. The fromula for them was:
Conus = depth of the hole*radius of the driller^2*pi
Cylinder= ((depth of the hole*pi)/3) * (radius of the hole ^2 + radius of the driller* radius of the hole + radius of the driller^2)
As unit for the density g/cm^3 was used.
density = g/cm

Temporal Extent

08-11/2012

Data Analysis

For the analysis the dependent variable is DC and the explenatory variable are:
scbase
Insects
Fungi
resprout
burned
50% lost
freebranch
dens_cone
dens_cyl

Data columns available in the raw data part of this dataset

Nr
Nr of woody item (either stub or debris) per plot; Datagroup description: Nr,
Data group: Helper
Values
12
13
10
11
1
DC
decomposition class of the stub
Data group: Decomposition class
Keywords: decomposition
Values
3
1
4
0
2
scbase
Base diameter of the wood stub
Unit: centimeter
Data group: Sample diameter
Keywords: basal diameter
Values
100
102
104
105
103
sctop
Top diameter of the wood stub
Unit: centimeter
Data group: Sample diameter
Keywords: diameter
Values
10
100
103
102
101
Species
species of the stub; Datagroup description: y
Data group: Scientific plant species name
Keywords: Scientific plant species name
Values
Castanea henryi
Albizia kalkora
Camellia oleifera
Camellia spec.
Adinandra millettii
Position_X
Position of the tree in east west direction, using the position numbers of the planted trees
Data group: Position within Main experiment plots
Values
03:14
07:08
08:07
0
06:07
Position_Y
Position of the tree in north south direction, using the position numbers of the planted trees
Data group: Position within Main experiment plots
Values
07:08
0
01:12
06:07
01:11
h1
first height of the stub
Unit: centimeter
Data group: Length of an Object
Keywords: snag height
Values
100
102
10
1
0
h2
second height of the stub;
Unit: centimeter
Data group: Length of an Object
Keywords: snag height
Values
1
0.5
102
10.2
10
h3
third height of the stub
Unit: centimeter
Data group: Length of an Object
Keywords: snag height
Values
10
0
1
102
100
h4
fourth height of the stub;
Unit: centimeter
Data group: Length of an Object
Keywords: snag height
Values
100
0.5
0
10
1
Sub._sample
number of wood sample for density measurement within plot (unique per plot); Datagroup description: Sub._sample
Data group: Helper
Values
1
3
4
2
0
Fungi
Occurrence of fungi fruit bodies on the stub yes(1)/no(0)
Data group: Fungi occurrence
Keywords: fungi
Values
0
1
Termites
Occurrence of insects (termites) on the stub yes(1)/no(0)
Data group: Organisms found on or in specimen
Keywords: insect
Values
0
1
Person_recording
Person_recording
Data group: Helper
Values
John
unknown
Bing
resprout
did the tree stub resprout yes (1)/ no (0)
Data group: Resprout
Values
1
0
mulitstem
mulitstem, number of stems more than one
Data group: Multistem
Keywords: multistems
Values
14
1
10
0
13
burned
was the tree stub burned yes (1)/no(0); Datagroup description: indication if the sample has been burned
Data group: Burned
Keywords: burning
Values
0
1
lost_50
is more (1) or less (0) than 50% of the stub decomposed
Data group: Decomposition class
Keywords: decomposition
Values
0
1
free_branch
is it a stub or a free branch (1) or not (0)
Data group: Woody debris type
Keywords: coarse woody debris
Values
0
1
10
fallen_down
does the stub stand upright (0) or does it lay on the ground (0)
Data group: Woody debris type
Values
1
0
Plot
plot code where the tree stub was measured; Datagroup description: y
Data group: Plot name Main experiment (letter, number code)
Keywords: plot
Values
E33
E27
D29
C32
E31
Date
this is a date column; We provide three different types of dates: dates recognized in Excel are given to other software usually in the form "date(2009-07-14)", but you can also use the form "date(14.07.2009)" or just a 4 digit year, then specifying "year" in Data type; Datagroup description: y
Data group: Date time information
Keywords: date
Values
01.09.2012
03.09.2012
02.09.2012
02.10.2012
03.10.2012
ID_Code
identification code of stubs, not unique in case of multistem individuals; Datagroup description: Helper column to understand other columns in this data set
Data group: Identifier
Values
Site_A_C32_1
Site_A_C32_10
Site_A_C32_13
Site_A_C32_11
Site_A_C32_12
Site
Site
Data group: Experimental Site
Keywords: Site A, Site B
Values
Site_A
Site_B
Class
the phylogenetic class of the plant
Data group: Helper
Values
angiosperms
gymnosperms
dens_cone
wood density calculated with the approximation of cone
Unit: g per cubic centimeter
Data group: Wood density
Keywords: wood density
Values
0.0557357834
0.037189291900000004
0.0488750207
0.053070159000000006
0.0455401084
dens_cycl
wood density calculated with the approximation of cylinder
Unit: g per cubic centimeter
Data group: Wood density
Values
0.050583122
0.044566479000000006
0.0531238268
0.038371758000000006
0.0325494181