CSPs: Tree size measures and corrected tree tags in the CSPs - 2010

Usage Rights

This data is Private.

BEF-China intern; supervisor is Zhiyao Tang (zytang@pku.edu.cn)

Dataset Abstract

Corrections of tags given to tree stems in the CSPs. Tree size measurements (basal diameter, diameter at breast height, height) of the trees in the CSPs performed in 2010.

Dataset Design

Each CSP consists of 9 subplots, trees in the center subplot were studied with greater intensity. Small stems are measured only in the central plot, larger stems might be in central plot or somewhere else, they are not marked.

Spatial Extent

The Gutianshan National Nature Reserve (NNR) is located in the western part of Zhejiang Province (29º8'18" – 29º17'29" N, 118º2'14" – 118º11'12" E, Fig. 1). The Gutianshan NNR has an area of approximately 81 km2 and was initially established as a National Forest Reserve in 1975 and became a National Nature Reserve in 2001. The NNR comprises a large portion of broad-leaved forests of advanced successional stages (Hu & Yu 2008), which have not been managed since the beginning of the 1990ies, as well as young successional stages and conifer plantations, mainly of Cunninghamia lanceolata and Pinus massoniana. --- The vegetation is composed of different types of subtropical evergreen and mixed broad-leaved forests (Yu et al. 2001). Most of the stands are secondary forests, evidenced by maximum tree ages of 180 years, by agricultural terraces in almost all plots and by the presence of charcoal in almost all soil profiles. Around the Gutianshan NRR extensive deforestation has occurred during the Great Leap Forward in the 1950s, as in most parts of Southeast China. However, due to prevailing steep slopes, the Gutianshan area was only marginally usable for agricultural activities, and thus an exceptionally intact forest cover has been preserved. --- The climate at Gutianshan NNR is warm and temperate with a short dry season in November and December and with warm summers (Fig. 2). The climatic conditions are characteristic for the subtropics with an annual average temperature of 15.1°C, January minimum temperatures of -6.8°C, July maximum temperatures of 38.1°C and an accumulated temperature sum (≥ 5°C) of 5221.5 degree days.

Temporal Extent

2010 repetition of measurements on trees measured in 2009 and 2008

Taxonomic Extent

Tree species in the Comparative study plots.

Data Analysis

This data can be used to identify tree stems with the "stemID" column. It can also be used to estimate tree size and therefore biomass using allometric equations. The simplest one would be to calculate the volumn of a cone from dbh and height.

Freeformat files (1)

  • CSP.DBH2010.xls (348 KB)
    A different version of the same data that also includes the subplots of the CSPs. But mind that species etc are not controlled in this asset file.

Paper proposal submissions

Published

2013

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: CSP, stem, tree, object
Values
CSP01_363041_1
CSP01_363012_1
CSP01_362568_1
CSP01_363060_1
CSP01_363013_1
CSP
name of the CSP in the Nature ReserveBEF research plot nameReasearch plots of the Biodiversity - Ecosystem functioning experiment (BEF-China). There are three main sites for research plots in the BEF Experiment: Comparative Study Plots (CSP) in the Gutianshan Nature Reserve, having a size of 30x30m^2, measured on the ground.
Data group: BEF research plot name
Keywords: CSP, location
Values
CSP01
CSP05
CSP03
CSP02
CSP04
stemTag
Number on the metal tag given in 2008 and 2009 and corrected in 2010, see newstemtag.
Data group: CSP metal tag number (trees, woody debris)
Values
355601
363036
363012
362568
363013
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)
Keywords: CSP metal tag number, CSP
Values
1844
1391
1112
2510
2639
newstemtag
Corrected number on the metal tag given to a tree in 2008 and 2009, with few additions in 2010.
Data group: CSP metal tag number (trees, woody debris)
Keywords: tree, object
Values
1112
2510
1844
1391
2639
old_species
Species name as used in older and uncorrected versions of the biomass file.
Data group: Scientific plant species name
Values
Alniphyllum fortunei
Acer amplum
Alangium kurzii
Adinandra millettii
Albizia kalkora
Rename
Species name corrections
Data group: Scientific plant species name
Values
Adinandra millettii
Acer cordatum
Albizia kalkora
Actinidia spec.
Alangium kurzii
species_2012
species name, update state 2012: There is a separate file that stores stem identifiers (stemID) and species names for CSPs.
Data group: Scientific plant species name
Keywords: species, explanatory
Values
Alangium kurzii
Acer amplum
Actinidia spec.
Adinandra millettii
Acer cordatum
BD
basal diameter
Unit: cm
Data group: Basal diameter
Keywords: response variable, basal diameter, size
Values
3.06
3.12
3.1
3.15
3
DBH
diameter at breastheight; Instrumentation: diameter tape, calliper (derived from datagroup)
Unit: cm
Data group: Diameter at breast height
Keywords: response variable, dbh, size
Values
10
10.15
10.05
10.2
10.1
Height
height of the tree; Instrumentation: Vertex Forester (derived from datagroup)
Unit: m
Data group: Plant height
Keywords: response variable, height, size
Values
0
0.7
0.6
0.3
0.5
Height_comments
comments on the status of the tree, especially if the height cannot be determined if the tree is broken at the top
Data group: Helper
Values
KN: this stem had bigger dbh in 2008 (17cm). This would make sense looking at the height of the stem.
Stem_inclination
stem inclination; Datagroup description: Stem morphology is measured as stem inclination and stem azimuth. To obtain the degree of stem inclination, we first measuredthe height of the bifurcation point (height at which the lowest living crown branch of the tree branches off, excluding epicormics orsprings), and then the horizontal distance of the bifurcation point from the stem in the direction of the slope. The angle ofinclination was calculated as tan alpha of these two distances. If the stem was inclined towards the slope, stem inclination wasconsidered to be negative. Stem azimuth was measured by placing a 1.3 m long woody stick with a wooden pendular along the stem. The direction of the pendular was measured by means of a compass.--- Stem slenderness is calculated as total height divided by stem diameter
Data group: Stem morphology
Keywords: stem morphology, co-variable
Alert Sample values are not displayed because this column hasn't been approved yet.
Other_comments
comments
Data group: Helper
Values
??
14.1(remove some part of bark)
????
69.75 is diameter of the sum of two stem
??17
stemTag_Comments
comments on stemTag
Data group: Helper
Values
360073XX
360579XX
360667XX
363049XX
269521XX
Year
year
Data group: Date time information
Keywords: date
Values
2010