Main Experiment: Leaf demography in the Main Experiment - 2011

Usage Rights

This data is Free within projects.

Dataset Abstract

Several field studies have shown the positive effect of diversity on primary productivity in grasslands. However, little is known about forest ecosystems, which are responsible for more than 50 % of global net primary productivity (NPP).
In these ecosystems, a major proportion of the aboveground net primary production is fine litter fall. Therefore, in this project we will investigate the relationship between tree diversity and leaf demography during the initial development of forest communities in the Main Experiment.
Leaf cohorts were marked on randomly selected branches of the 4x4 central tree individuals in the VIP and VIP replicate plots in site A and site B (128 plots in total; 6 diversity levels -from 1 to 24 species per plot).
The cohorts were monitored four times from early spring to late summer. Every visit we put a mark (wire ring) below the leaf closest to the apical meristem and we recorded the estimated number of total leaves in the tree, the number of new leaves in the marked branch (since the last visit), the number of leaves in the selected branch (old and new leaves), the number of leaves which show some herbivory damage and the herbivory score (a scale based on the percentage of the leave area that was damaged).

Dataset Design

Leaf cohorts were marked on randomly selected branches of the 4x4 central tree individuals in the VIP and VIP replicate plots. The cohorts were monitored four times from early spring to late summer. Every visit we put a mark (wire ring) below the leaf closest to the apical meristem and we recorded the estimated number of total leaves in the tree, the number of new leaves in the marked branch (since the last visit), the number of leaves in the selected branch (old and new leaves), the number of leaves which show some herbivory damage and the herbivory score (a scale based on the percentage of the leave area that was damaged).

Spatial Extent

Main experiment
29°08'-29°11'N
117°90'-117°93'E
The VIP and VIP replicate plots (128 plots) are located in the Main Experiment. It consists of two sites (A & B) located near to the village Xingangshan in Dexing County, Jiangxi province. Each site covers 256 1-mu plots (after excluding all plots from the F and G scenarios and all plots with 0- tree species richness). Each plot comprises 400 trees (planted as 20x20 grid).

Published

Emmerth, D. 2012. Effects of tree species richness on leaf demography in a Chinese subtropical forest. MSc thesis, University of Zurich

Temporal Extent

The leaf cohorts were monitored four times from early spring to late summer in 2011.

Taxonomic Extent

The central 4x4 tree individuals of all VIP and VIP replicate plots in site A& B.

Data Analysis

We will estimate the leaf birth rate, leaf mortality rate and the herbivory rate. E ffects of species richness on the mortality rates and the birth rates will be analyzed on the plot level as well as on the level of the individual species.
In addition, we will test if different traits (deciduous vs evergreen and single vs composite leaves) show significant effects on the mortality rates and the birth rates.

Data columns available in the raw data part of this dataset

PTAG
Plot ID across CSP, MainA & MainB. See BEF-database for further details.; Source: BEF research plot name
Unit: id
Data group: PTAG
Keywords: Main Experiment, Site A, Site B
Values
p103320
p105310
p105240
p105320
p105230
* BEF research plot name also contributed to this column.
IDtree
Identification code used by SP1e/SP2E during the inventory. This ID code was written on the plastic labels attached to the trees and refers to their position within the plot (e.g. 8.8: row 8, column 8 in the 20*20 plot grid). Note that this code was given by SP1e/SP2 e students and does not always coincide always with the labels (barcode paper labels in 2011 or metal labels from 2012) that were later attached to the trees by Z1.
Unit: id
Data group: Individual position within plot in Site A or B (given by SP1/SP2)
Values
id10.11
id10.8
id10.9
id10.10
id11.10
species
species name of the individual; Datagroup description: Scientific plant species name
Unit: id
Data group: Scientific plant species name
Keywords: species
Values
Betula luminifera
Acer davidii
Ailanthus altissima
Castanea henryi
Alniphyllum fortunei
time
number of visit and assesment of the leaf cohorts
Data group: Time series
Keywords: leaf demography
Values
t2
t1
t3
t0
date
day of year number when the visit/assesment was done
Data group: Date time information
Keywords: leaf demography
Values
118
105
107
104
109
tree.leaves
estimated number of leaves in the whole tree
Data group: Leaf demography
Keywords: leaf demography
Values
1
10
0
1000
100
branch.leaves
number of leaves in the marked branch (from the first mark to the apical meristem)
Data group: Leaf demography
Keywords: leaf demography
Values
11
10
12
1
0
new.leaves
number of new leaves in the marked branch since the previous visit/assessment
Data group: Leaf demography
Keywords: leaf demography
Values
10
1
12
11
0
damaged.leaves
number of leaves in the marked branch that show some sign of herbivory
Data group: Herbivore load
Keywords: herbivory, leaf demography
Values
0
11
12
1
10
herbivory.score
estimated herbivory damage. It refers to the percentage of the leaf area that has been lost or damaged due to herbivory
Data group: Herbivore damage
Keywords: herbivory, leaf demography
Values
4
2
3
1
0
leaves.above
number of leaves that are above the metal ring (mark). During every assesment, the mark was put below the last 1-3 apical leaves so it would not fall later. This should be considered when calculating the birth rate or mortality of leaves
Data group: Leaf demography
Keywords: leaf demography
Values
0
11
12
1
10
leaf.length
length of a randomly chose leaf of the marked branch
Unit: cm
Data group: Leaf demography
Keywords: leaf demography
Values
0.9
0
0.5
0.7
0.8
comments
comments
Data group: Leaf demography
Values
dead/missing; it is alive and it K. Bipinnata (no C. Eyrei), no marks
dead/missing
dead is almost dead, all leaves are dried
dead/missing; big tree alive, not sure if it is then 11.15?
dead/missing (data lost?)