Main Experiment: Kinetic energy of rain drops in the main experiment - data

Usage Rights

This data is Free within projects.

Dataset Abstract

Soil erosion by water is an important process regarding ecosystem stability and ecosystem functions; this is especially true for subtropical regions with high intensity rainfall. Rainfall erosivity is one important factor in estimating soil erosion as an ecosystem function under forest. The power of raindrops to detach sediment at the soil surface is influenced by drop size and velocity. When passing through vegetation, rain drop size as well as rain drop velocity are changed depending on several vegetation parameters e.g. leaf area index (LAI). The role of biodiversity as one of these vegetation parameters on soil erosion processes is not yet clear and more information on the spatial distribution of throughfall under vegetation canopies is needed. To measure biodiversity effects on throughfall kinetic energy (TKE), splash cups have been used. 1800 Splash Cups were installed in the field during five different rainfall events on 40 plots with different tree diversity levels with a total of 24 tree species. For investigating spatial distribution of TKE, these splash cups have been set up in distinct distances from tree individuals (15cm, 30cm and 45cm away from stem, in the middle of two and four individuals, under the first branch, at the intersection of a 45cm and 105cm circle around two stems and one free from vegetation to determine freefall kinetic energy).

Dataset Design

360 splash cups on 40 VIPs and VIPreps covering tree diversity level from 1 to 24. 9 splash cup on each plot, 1 splash cup is freefall reference, 8 splash cups under distinct position in core area.

Spatial Extent

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

Temporal Extent

May to July 2013

Data Analysis

LME, Wald tests for significances

Paper proposal submissions

Published

2014

Data columns available in the raw data part of this dataset

Site
Indicates the experimental site within the BEF-China Project
Data group: Experimental Site
Keywords: Main Experiment, Site
Values
A
plot
Experimental Plot within Site
Data group: Plot name Main experiment (letter, number code)
Keywords: Main Experiment, plot
Values
C32
E33
E34
E24
E31
position
Specific splash cup position on core area of each plot: position 1: 15cm away from tree stem position 2: middle of two trees position 3: middle of four trees position 4: 45cm away from tree stem position 5: 45cm x 120 cm intersection position 6: first branch position 7: 75cm x 75cm intersection position 8: 30 cm away from tree stem position 9: no vegetation reference
Data group: Splashcup position
Values
P4
P2
P5
P1
P3
sandloss
sandloss
Unit: g / 16,6cm²
Data group: Deriving kinetic energy from sand loss
Values
0.11
0.08
0.12
0.1
0.01
precip_cm
rainfall measured at each splash cup with rainfall bottle
Unit: cm
Data group: Precipitation
Values
0.7
0.5
0.4
0.3
0.6
precip_ml
rainfall measured at each splash cup position
Unit: ml
Data group: Precipitation
Values
103.27
109.81
1
106.54
100
event
rainfall event in summer 2013, measured with splash cups
Data group: Rainevent for determinig kinetic energy of rainfalls
Values
E3
E2
E5
E1
E4
precip
total rainfall amount climate station A
Unit: mm
Data group: Precipitation
Values
6.6
23.3
39.3
185.7
61.2
intensity_mean
mean rainfall intensity per rainfall event
Unit: mm/h
Data group: Precipitation
Values
6.07
3.42
4.25
2.83
2.29
peak_intensity_30
peak intensity during 30 minutes rainfall
Unit: mm
Data group: Precipitation
Values
4
19.2
12.9
4.8
4.2
peak_intensity_60
peak intensity of 60 minutes rainfall
Unit: mm
Data group: Precipitation
Values
21.7
15
4.6
7.2
6.2
covered_splashcup
yes/no category variable if splash cup is covered by vegetation or not
Data group: Covered splash cup
Values
y
n
LAI
leaf area index (LAI) measured with Nikon D10 and analyzed in Hemi View over each splash cup position
Data group: Leaf Area Index (LAI)
Values
0.026
0.03
0.02
0.014
0.028
ground_cover
leaf canopy cover calculated by HemiView at each splash cup position Main Experiment Site A with values from 0 to 1.
Data group: Canopy structure
Values
0.017
0.009
0
0.001
0.011
divers_level
tree species richness of the respective study plot
Data group: Taxonomic biodiversity
Values
16
24
2
4
1
species_pos
species position of individuals influencing one splash cup
Data group: IdTree Splashcup
Values
0710, 0810
0807, 0808
0811, 0911
0809, 0909
0808, 0908
species_ident_short
species identity abbreviations, matched with data column species_pos
Data group: Helper
Values
cah
cae
cah_nys
cae_scs
cah_lif
species_idents
species identities of surrounding tree individuals
Data group: Species identity of surrounding tree/shrub individuals
Values
C. axillaris
C. axillaris, Q. serrata
C. axillaris, C. axillaris
C. axillaris, Q. serrata, L. formoasana, M. azedarach
C. axillaris, S. sebiferum
elevation
Elevation of each plot at Site A
Data group: Elevation
Values
136.463
123.6013
142.521
115.4247
134.6243
aspect
Aspect of each plot at Site A
Data group: Aspect
Values
119.21777
117.17444
165.54609
168.68288
139.28215
neighbor_div
neighbourhood diversity (i.e. the number of different species) of trees surrounding one splash cup
Data group: Helper
Values
3
2
NA
1
4