CSPs: Tree size in the CSPs in 2008 and 2009

Usage Rights

This data is Private.

BEF-China intern

Dataset Abstract

Tree size in diameter at breastheight (dbh) and/or basal area, as well as height of trees found in the CSPs. Tree tags and species names were later corrected in 2010, so for the corrected species names please refer to the data set "Corrected tree tags on the CSP trees and tree size measures from 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.

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)

Paper proposal submissions

Published

2013

2012

2010

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_362568_1
CSP01_363012_1
CSP01_363041_1
CSP01_363013_1
CSP01_363060_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
CSP02
CSP05
CSP04
CSP03
stemTag
Number on the metal tag given in 2008 and 2009 and corrected in 2010, see "new stem tag" in the data set "Corrected tree tags on the CSP trees and tree size measures from 2010."
Data group: CSP metal tag number (trees, woody debris)
Keywords: object
Values
363013
363036
363012
362568
355601
old_Species
Species name as used in older and uncorrected versions of the biomass file. See dataset "Corrected tree tags on the CSP trees and tree size measures from 2010." for the corrected species names.; Datagroup description: Helper
Data group: Helper
Keywords: species, explanatory
Values
Albizia kalkora
Acer amplum
Alniphyllum fortunei
Alangium kurzii
Adinandra millettii
BD
basal diameter
Unit: cm
Data group: Basal diameter
Keywords: response variable, basal diameter, size
Values
2.6
1.7
2.4
2.8
2.5
DBH
diameter at breastheight; Instrumentation: diameter tape, calliper (derived from datagroup); Instrumentation: diameter tape, calliper (derived from datagroup)
Unit: cm
Data group: Diameter at breast height
Keywords: response variable, dbh, size
Values
10.05
10.06
10
10.03
10.02
Height
height of the tree; Instrumentation: Vertex Forester (derived from datagroup); Instrumentation: Vertex Forester (derived from datagroup)
Unit: m
Data group: Plant height
Keywords: response variable, height, size
Values
0.5
0.9
10
1
0.8
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
Approximated_length_5_m
Approximated_length_4_m
Approximated_length_3.5_m
Approximated_length_3_m
Approximated_length_2.5_m
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; 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
Values
20
25
15
10
30
Other_comments
comments
Data group: Helper
Values
371980_wrong
370912_wrong
369060_wrong
372860_wrong
377719_wrong
Year
year
Data group: Date time information
Keywords: date
Values
2009
2008
broken
top of the tree is broken, folded, or fallen; Datagroup description: Living status
Data group: Living status
Keywords: response variable, survival, co-variable, mortality, damage
Values
broken
folded
fallen
* Nadrowski, K. also contributed to this column.
comment CWD
comments, for example: CWD is coarse woody debris; comparison with coarse woody debris file; Datagroup description: Helper
Data group: Helper
Values
branch found CWD ID CSP04_1
CSP05_2
branch found: CWD ID CSP01_30, CSP01_33
CSP04_34
CSP05_3
* Nadrowski, K. also contributed to this column.