Decomposcape (general): plot topography data, Main Experiment, Site B

Usage Rights

This data is Free within projects.

Usage rights for Sp5; Acknowledgements: Michael Leppert, Manuel Hiß, Mr. Qi, Chinese helpers, Katherina Pietsch, Chen Lin

Dataset Abstract

For the “decomposcape” approach, a total of 4131 litter bags were filled with single-species litter of Osmanthus fragrans, Pinus massoniana and Schima superba, respectively. These bags have been fixed on the soil surface across both field sites. The positioning of the litter bags differ in topographic features, and in the diversity of the newly planted tree species. By studying the litter decomposition dynamics over time, we will thus quantify the effects of topography, micro-relief, microclimate and plot tree species diversity on decomposition dynamics. The study is part of the "Ecoscape approach". This dataset contains the plot topography data of all leaf litter decomposition plots at site B.

Dataset Design

Polyester bags (15 x 15 cm, 1 x 1.5 mm mesh size, 5 g litter) were used to determine the mass loss of the leaves of three local tree species: Schima superba (collected in autumn 2010 in a secondary forest near the experimental sites), Pinus massoniana and Osmanthus fragrans (both collected in a monoculture plantation near the experimental sites). The leaves were dried at 65°C for 24 hours.
We exposed the litterbags at three positions (suplots) within the 35 different tree diversity plots and their corresponding replicates at both sites of the “Main Experiment”. Per subplot, three litterbags of each species were randomized and pinned directly onto the soil after removing the herb layer. Thus, a total of 3780 litterbags were deposited on 420 subplots across two sites. Additionally, a 25 cm wide frame of water permeable plastic fabric was pinned around the litterbag square to avoid weeds from growing into the subplots. After two, six and eleven months, one bag per litter species was sampled per subplot to determine the remaining dry mass of the leaves after cleaning.
For the topographic components we measured the inclination, aspect and soil-shape on each subplot. To calculate the microclimatic parameters, air humidity and temperature were measured with onset®,HOBO® Pro v2 data logger (Onset Computer Corporation, Bourne, USA) every 30 min on one subplot per diversity level. Additionally, soil moisture measurements were conducted once a month with a ThetaProbe ML2x FD-Sonde and Infield7 handheld meter (UMS GmbH Munich, Germany).

Spatial Extent

Main Experiment,Site B
29°08'-29°11'N
117°90'-117°93'E

Temporal Extent

October 2011-September 2012

Taxonomic Extent

Leaf litter of Schima superba, Pinus massoniana and Osmanthus fragrans

Measurement Circumstances

hot, sunny, mosquitos

Data Analysis

Plot aspect and inclination were determined with a Recta compass with built-in clinometer; the microrelief was assessed according to a scale from 1 (strongly convex) - 5 (strongly concave)

Paper proposal submissions

Published

2016

Data columns available in the raw data part of this dataset

PLOT_NO
name of each plot, coded with letters and numbers
Data group: Plot name Main experiment (letter, number code)
Keywords: Main Experiment, Site B
Values
D29
H29
G28
F26
F25
dec_subplot_ID
Decomposcape litter decomposition subplot ID within main plot
Data group: Decomposcape subplot within Main
Keywords: topography, litter decomposition, Decomposcape, Ecoscape, Site B
Values
Dec_B_F25_S2
Dec_B_F25_S1
Dec_B_D29_S3
Dec_B_D29_S1
Dec_B_D29_S2
x_pos
x-position of left upper tree at plot when looking to north direction
Data group: Tree or shrub position within experimental plot
Keywords: topography, litter decomposition, Decomposcape, Ecoscape, Site B
Values
08
09
05
06
07
y_pos
y-position of left upper tree at plot when looking to north direction
Data group: Tree or shrub position within experimental plot
Keywords: topography, litter decomposition, Decomposcape, Ecoscape, Site B
Values
06
11
07
05
12
inclination
plot inclination
Unit: °
Data group: Inclination
Keywords: topography, litter decomposition, Decomposcape, Ecoscape, Site B
Values
12
15
11
13
10
* Pietsch, K. also contributed to this column.
aspect
plot aspect
Unit: °
Data group: Aspect
Keywords: topography, litter decomposition, Decomposcape, Ecoscape, Site B
Values
118
10
116
109
100
* Pietsch, K. also contributed to this column.
aspect_NWSE
cardinal direction
Data group: Aspect Categories
Keywords: topography, litter decomposition, Decomposcape, Ecoscape, Site B
Values
W
S
N
E
NA
shape
micro relief
Data group: Curvature
Keywords: topography, litter decomposition, Decomposcape, Ecoscape, Site B
Values
5
3
1
4
2
PTAG
research plot name. Research plots on the main experiment have a "p" in front of their IDs and then a 6 digit code: Plots in the main sites A and B are named according to their position in the original spreadsheet, in which they were designed. They consist of 6 digits: _1st digit_: Site (1:A, 2:B), _digit 2and3_: southwards row: as in spreadsheets the rows are named from the top to the bottom; _digit 4 and 5_: westward column: as in the original spreadsheet, but the letters are converted to numbers (A=01, B=02); _6th digit_: indicator, if the plot has been shifted a quarter mu. Example: "p205260": "p" means that this is a plot that is specified. "2" means, that we are at site B. Now the coordinates of the south - west corner: "0526". Since "e" is the fifth letter of the alphabet, this is Plot E26. The last digit "0" means that this plot was not moved by a quarter of a Mu, as some sites in Site A. The 6th digit can also indicate the subplot within the plot. "5", "6", "7", "8" indicate the northwest, northeast, southeast, and southwest quarter plot respectively.
Data group: BEF research plot name
Keywords: Main Experiment, Site B
Values
p204290
p207280
p206260
NA
p206250