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Title:
Tree and shrub species functional traits across a light-availability gradient in Dujiangyan
Access rights:
Private
Usage rights:
No information available
Published:
No information available
Abstract:
Here we present the result from a two-year field experiment in which we transplanted seedlings of 14 woody species representing three contrasting functional types(broad-leaved evergreen, deciduous and coniferous species) along a light gradient into the understory of a subtropical forest in southwestern China. We assessed mortality and measured the growth rate of all transplanted individuals at intervals. To further understand the mechanisms leading to seedling mortality and growth, we examined three functional traits of transplanted individuals (SLA, leaf mass ratio, wood density).
Design:
Fifteen shade houses were arranged in a 3 × 5 grid with a 2 m distance between shade houses. These shade houses represented three light levels with five houses as replicates for each level. The light levels were created by covering shade houses with layers of neutral shade netting with different density. The shade houses had a height of 2.2 m and an area of 4 × 5 m. Instantaneous PAR (Photosynthetically Active Radiation) readings were made both outside and inside each shade house using an SKP 215 PAR Quantum sensor. These measurements indicated that the plants were receiving 43.7±2.1%, 17.1±0.73%, 2.74±0.1% of full daylight in the high-, medium-, and low-light shade houses. The light condition gives a good simulation to the natural light gradient in the forest as 50% is usually encountered in open areas and 3% in understory of subtropical forests in the region (observations by the author). To avoid environmental heterogeneity affecting experiment results, we applied a random-block design, i.e. each of the three light levels occurred once in each block of three houses and was positioned in a random sequence. The fourth light level (full daylight) was performed outside of the shade houses. We marked 5 quadrates next to each other besides the area of the shade houses, with at least a distance of 1 m between quadrates.Air temperature and soil temperatures were measured with a Hobo U12-015 temperature data logger. We hung one thermometer in the air inside one of the shade houses and buried another thermometer 10 cm below the top soil in the same shade house. Measurements were taken every hour from day 58 until the end of the experiment, and mean daily temperatures were calculated. Seeds were collected from under parent trees in subtropical forests in the Dujiangyan region in spring 2007. All seeds were processed on the day of collection.Seeds were then germinated under a shade cloth in a nursery. In August 2007, the seedlings were individually transplanted into plastic plots (30 cm height, 30 cm diameter) filled with farmland top soil. Two seedlings from each of the 14 species were placed into each shade house and in each full-light quadrate, yielding a total of 560 pots with a single test plant each. The pots were arranged in a hexagonal pattern with a distance of 0.5 m between neighboring pots (0.8 m between the centers of neighboring pots) to avoid shading. Two weeks after moving pots to shade houses, we replaced dead seedlings with ones of the same species sown at the same time. Plants were watered every 3–4 days or when the soil was dry.The traits included the three growth components net assimilation rate (NAR), specific leaf area (SLA) and leaf mass ratio (LMR) as well as other gas-exchange traits
Spatial extent:
The experiment was carried out from August 2007 to July 2009 in an experimental garden near Dujiangyan, southwest China (31°04’ N, 103°43’ E). The climate in the region is characterized by a mean annual temperature of 15.2°C and an average July temperature of 25°C. The mean annual precipitation at Dujiangyan is 1341 mm with a dry season in winter (November–April) and with warm and rainy summers (May–October). The annual average relative humidity is above 80%. The vegetation in the region can be classified as a secondary conifer and broad-leaved mixed subtropical forest.
Temporal extent:
August 2007 to July 2009
Taxonomic extent:
The 14 species used in this study are all woody species commonly found in the study region. These species were selected according to their leaf habit, successional status and seedling availability. There were seven broadleaved-evergreen and seven broadleaved-deciduous species. The deciduous species are either early-successional (Alangium chinense, Castanea henryi and Rhus punjabensis) or intermediate. In evergreen species, Pyracantha fortuneana and Lindera communis are early-successional, Phoebe zhennan is late-successional and the rest are intermediate.
Measurement cirumstances:
No information available
Data analysis:
No information available

Filter:
Dataset column

Name:
species
Definition:
species short name; this is a number which refers to the species given in the column "spcode"
Unit:
No information available
Datagroup:
Helper
Keywords:
No information available
Values:
13
10
12
1
11
Contributors:
No information available

Dataset column

Name:
spcode
Definition:
Scientific name of the respective species; according to the "Flora of China"
Unit:
No information available
Datagroup:
Scientific plant species name
Keywords:
species
Values:
Choerospondias axillaris
Aralia chinensis
Castanea henryi
Camellia oleifera
Alangium chinense
Contributors:
No information available

Dataset column

Name:
ed
Definition:
e-evergreen; d-decidous; Datagroup description: Plant functional group or life form
Unit:
No information available
Datagroup:
Plant functional group or life form
Keywords:
functional trait
Values:
e
d
Contributors:
No information available

Dataset column

Name:
edcon
Definition:
ey-evergreen conifer; e-evergreen broad-leaved; d-deciduous broad-leaved; Datagroup description: Plant functional group or life form
Unit:
No information available
Datagroup:
Plant functional group or life form
Keywords:
functional trait
Values:
d
e
ey
Contributors:
No information available

Dataset column

Name:
block
Definition:
block; Datagroup description: Block
Unit:
No information available
Datagroup:
Dujiangyan experimental blocks
Keywords:
location
Values:
5
3
4
1
2
Contributors:
No information available

Dataset column

Name:
house
Definition:
house; Datagroup description: Block
Unit:
No information available
Datagroup:
Dujiangyan experimental blocks: houses
Keywords:
location
Values:
12
10
11
13
1
Contributors:
No information available

Dataset column

Name:
indiv
Definition:
individuals; Datagroup description: Individual Identifier
Unit:
No information available
Datagroup:
Dujiangyan Individual Identifier
Keywords:
tree, object, seedling
Values:
3
2
4
1
Contributors:
No information available

Dataset column

Name:
ID
Definition:
identical number for each seedling; Datagroup description: Individual Identifier
Unit:
No information available
Datagroup:
Dujiangyan Individual Identifier
Keywords:
tree, object, seedling
Values:
10014
10011
10013
10012
10021
Contributors:
No information available

Dataset column

Name:
date
Definition:
number of days after initiation of the experiment
Unit:
day
Datagroup:
Date time information
Keywords:
date
Values:
203
677
351
Contributors:
No information available

Dataset column

Name:
harvest
Definition:
times of the harvests
Unit:
No information available
Datagroup:
Time series
Keywords:
date
Values:
2
3
1
Contributors:
No information available

Dataset column

Name:
height
Definition:
seedling height
Unit:
cm
Datagroup:
Plant height
Keywords:
response variable, height, size
Values:
100.5
100.3
100.7
100.6
10
Contributors:
No information available

Dataset column

Name:
change
Definition:
change of light level (c-changed,uc- unchanged)
Unit:
No information available
Datagroup:
Helper
Keywords:
design variable
Values:
c
uc
Contributors:
No information available

Dataset column

Name:
girth_1
Definition:
girth in one direction;
Unit:
mm
Datagroup:
Stem girth
Keywords:
response variable, growth
Values:
0.12
0.09
0.1
0.11
0.08
Contributors:
No information available

Dataset column

Name:
girth_2
Definition:
girth in one direction;
Unit:
mm
Datagroup:
Stem girth
Keywords:
response variable, growth
Values:
0.12
0.14
0.1
0.09
0.13
Contributors:
No information available

Dataset column

Name:
light
Definition:
light level (L-low, M-medium, H-high, O-open air); Datagroup description: Soil attributes
Unit:
No information available
Datagroup:
Solar radiation
Keywords:
design variable
Values:
H
O
L
M
Contributors:
No information available

Dataset column

Name:
light.perc
Definition:
percentage of light; Datagroup description: Soil attributes
Unit:
%
Datagroup:
Solar radiation
Keywords:
design variable
Values:
17
3
100
44
Contributors:
No information available

Dataset column

Name:
light_a
Definition:
light level after changing; Datagroup description: Soil attributes
Unit:
No information available
Datagroup:
Solar radiation
Keywords:
design variable
Values:
M
O
L
H
Contributors:
No information available

Dataset column

Name:
light_a.perc
Definition:
percentage of light after changing
Unit:
%
Datagroup:
Solar radiation
Keywords:
design variable
Values:
3
44
17
100
Contributors:
No information available

Dataset column

Name:
Carbon
Definition:
carbon concentration in the leaves
Unit:
%
Datagroup:
Carbon
Keywords:
functional trait
Values:
38.35
41.49
37.28
32.44
31.66
Contributors:
No information available

Dataset column

Name:
Hydrogen
Definition:
hydrogen concentration in the leaves
Unit:
%
Datagroup:
Chemical elements
Keywords:
functional trait
Values:
4.723
4.982
4.355
4.421
5.167
Contributors:
No information available

Dataset column

Name:
Nitrogen
Definition:
nitrogen concentration in the leaves
Unit:
%
Datagroup:
Nitrogen
Keywords:
functional trait
Values:
1.286
1.141
1.122
1.132
1.125
Contributors:
No information available

Dataset column

Name:
Amax
Definition:
maximum assimilation rate on area basis
Unit:
umol CO2 m-2 s-1
Datagroup:
Photosynthesis
Keywords:
functional trait
Values:
10.31666667
10.56666667
0.284966667
10.14666667
10.46666667
Contributors:
No information available

Dataset column

Name:
BiomassR
Definition:
root biomass
Unit:
g
Datagroup:
Above and below ground biomass measurement
Keywords:
root, belowground biomass
Values:
0.04
0.05
0.06
0.07
0.03
Contributors:
No information available

Dataset column

Name:
BiomassS
Definition:
stem biomass
Unit:
g
Datagroup:
Above and below ground biomass measurement
Keywords:
stem, aboveground biomass
Values:
0.02
0.06
0.05
0.03
0.07
Contributors:
No information available

Dataset column

Name:
BiomassL
Definition:
leaf biomass
Unit:
g
Datagroup:
Above and below ground biomass measurement
Keywords:
leaf, aboveground biomass
Values:
0.05
0.03
0.01
0.08
0.06
Contributors:
No information available

Dataset column

Name:
BiomassA
Definition:
total biomass
Unit:
g
Datagroup:
Above and below ground biomass measurement
Keywords:
aboveground biomass
Values:
0.17
0.23
0.16
0.2
0.21
Contributors:
No information available

Dataset column

Name:
thickness
Definition:
leaf thickness
Unit:
mm
Datagroup:
Leaf thickness
Keywords:
functional trait
Values:
16
14
15
17
13
Contributors:
No information available

Dataset column

Name:
Larea
Definition:
leaf area
Unit:
cm2
Datagroup:
Leaf area
Keywords:
No information available
Values:
0.63
10047.51172
0.859570313
1006.69
10045.24899
Contributors:
No information available

Dataset column

Name:
sla
Definition:
Specific leaf area
Unit:
cm2 g-1
Datagroup:
Specific leaf area
Keywords:
No information available
Values:
0.1178
0.127343750074074
0.0865030674837419
0.139721254406915
0.163777777777778
Contributors:
No information available

Dataset column

Name:
Amass
Definition:
maximum assimilation rate on mass basis
Unit:
nmol g-1 s-1
Datagroup:
Photosynthesis
Keywords:
No information available
Values:
0.597835
0.365264323086688
1084.42871920066
1107.98481186985
1006.84967441295
Contributors:
No information available

Dataset column

Name:
Lcp
Definition:
light compensation point
Unit:
%
Datagroup:
Light compensation point
Keywords:
No information available
Values:
100.809266385376
10.7602387794836
106.158549444772
11.3981477401514
10.8492638500757
Contributors:
No information available

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15 schmid medium

Bernhard
Schmid

Owner of:
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125 li medium

Xuefei
Li

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