CSPs: Spatial coordinates of all tagged trees in Comparative Study Plots

Usage Rights

This data is Free for members.

Dataset Abstract

Spatial pattern, size and identity of plant individuals in the local neighbourhood have a significant impact on plant growth and mortality. This data set provides the information on spatial coordinates expressed by distance, horizontal distance and the azimuth to certain measuring point. The spatial pattern of tree stems can be reconstructed by using this collected spatial coordinates. This data was collected during end of March and beginning of April in all 27 Comparative Study Plots (CSPs) located in Gutianshan National Nature Reserve (GNNR). The distance, horizontal distance and azimuth of each tagged trees was measured from the certain measuring points. From the first measuring point, as many as possible trees were measured except ones with view obstruction between the measuring point and the tagged tree. In the later case, alternative measuring point was set and from which the remaining trees were measured. The spatial coordinate of the alternative measuring points in relation to the first measuring point was also recorded, so that the spatial coordinates of tree individuals measured from the alternative measuring points could be recalculated to generate a spatial coordinates in relation to the first measuring point.

Dataset Design

The metal tagged trees from SP1e/SP1c are the target trees. One measuring reference point was fixed in the subplot 22, from which the distance, horizontal distance and azimuth to each targe tree were measured. Because of the view obstruction, some tree individuals cannot be measured from the first measuring reference point. In this case, the alternative measuring reference point will be chosen and from which the remaining individuals were measured. One rule of working flow was kept: the further alternative measuring reference point is only chosen when all trees without obstruction problem were measured from the previous reference point. The spation coordination of the alternative measuring reference points to the first reference point were documented.

Spatial Extent

Comparative Study sites, BEF China Experiment, Gutianshan National Nature Reserve (GNNR), China. The GNNR is located in the western part of Zhejiang Province (29°8'18"-29°17'29" N, 118°2'14'-118°11'12'' E). The forest is representative of Chinese broad-leaved forests (Wu 1980, Hu and Yu 2008, Legendre et al. 2009) with evergreren species dominating the forest in number of individuals (Yu et al. 2001) but with approximately similar proportions of deciduous species in terms of species number (Lou and Jin 2000).

Taxonomic Extent

All metal tagged mature tree individuals in all CSPs

Data columns available in the raw data part of this dataset

StemID
ID of each stem, composed of the Plot number, tag identifier and stem number. The middle part is the silver Id, which was not unique in some cases, so that letters were added. Since multistem trees were only tagged once, they have a number added.
Data group: Tree identifier for trees in the comparative study sites (CSP plus Silver ID)
Keywords: stem, tree, CSP, object
Values
CSP01_363012_1
CSP01_363041_1
CSP01_363013_1
CSP01_2408_1
CSP01_362568_1
Retag
Correcting the entry in stemTag in the survey in 2010. This includes typos and also new additions of some tags.
Data group: CSP metal tag number (trees, woody debris)
Values
2639
2510
1391
1112
1844
Species
Scientific species name
Data group: Scientific plant species name
Keywords: species
Values
Acer cordatum
Acer amplum
Actinidia spec.
Adinandra millettii
Alangium kurzii
bd
basal diameter
Data group: Basal diameter
Keywords: basal diameter
Values
2.9
2.18
2.07
3
2.05
* Castro, N. also contributed to this column.
dbh
DBH
Data group: Diameter at breast height
Keywords: dbh
Values
10
10.04
10.02
10.1
10.05
* Castro, N., Chi, X. also contributed to this column.
Comments
Several trees cannot be measured from the original measuring central point (reference) because of view obstructions. So that for these trees measurement, alternative measuring points were required. This further measuring reference position was recorded from the original reference.
Data group: Helper
Values
371372
1: main stem broken
*
2 stems, smaller stem tagged
50 cm in Richtung 392,5 versetzt
sub
subplot within each CSP
Data group: Subplots within CSPs
Keywords: subplot
Values
13
2
1
11
12
Ref. Pos
C means the orinigal measuring central point. C1, C2, etc. are alternative measuring central points from which the trees which cannot be measured from C were measured. The positions/coordinates of the alternative measuring points to the C were indicated in the comment column
Data group: Spatial location of trees in CSPs
Values
C2
C 3
C
C3
C2 ?
* These persons could not be matched within the portal: Paul Wilm, Decheng Geng also contributed to this column.
Azimuth
The azimuth from the recorded measuring point (info from Ref. Pos) to the taged tree; Instrumentation: compass
Unit: degree
Data group: Azimuth
Keywords: tree position
Values
0.5
0
10
1
100
* These persons could not be matched within the portal: Paul Wilm, Decheng Geng also contributed to this column.
Dist.
The distance from the recorded measuring point (info from Ref. Pos) to the taged tree; Instrumentation: Vertex Forester-hypsometer
Unit: centimeter
Data group: Spatial location of trees in CSPs
Keywords: tree position
Values
0.7
1
0.8
0.9
0.5
* These persons could not be matched within the portal: Paul Wilm, Decheng Geng also contributed to this column.
H. Dist.
The horizontal distance from the recorded measuring point (info from Ref. Pos) to the taged tree; Instrumentation: Vertex Forester-hypsometer
Unit: centimeter
Data group: Spatial location of trees in CSPs
Keywords: tree position
Values
0.9
0.7
0.8
1
0.5
* These persons could not be matched within the portal: Paul Wilm, Decheng Geng also contributed to this column.