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Title:
CSPs: Kinetic energy of raindrops below target trees in the CSPs
Access rights:
Free for public
Usage rights:
Permission is granted to anybody to access, use and publish all open for public data freely. The commercial use of any data is prohibited. The quality and completeness of data cannot be guaranteed. Users employ these data at their own risk. In order to make attribution of use for owners of the data possible, the identifier of ownership of data must be retained with every data record. Users must publicly acknowledge, in conjunction with the use of the data, the data owners. Cite the data as follows: Geißler, C., Scholten, T. and Kühn, P. (2010): Measurements of kinetic energy under target trees in the CSPs. BEF-China data portal (Accessed through URL http://china.befdata.biow.uni-leipzig.de/datasets/170)
Published:
partly in "CATENA" (2012) and "Journal of Earth Sciences" (2010), method description in "Journal of Plant nutrition and Soil Science" (2012)
Abstract:
Sand-filled splash cups were used to study the erosivity of rainfall and throughfall in the humid subtropics of southeast China. Our results showed that the splash cup measurements yielded precise and reproducible results both under open field conditions and under forest vegetation. The splash cups were exposed to forest stands of different age and to selected species in the Gutianshan National Nature Reserve (GNNR). This dataset contains the measurements performed under selected trees.
Design:
Species specific measurements: Sets of five splash cups were positioned in a pentagon under target trees. The splash cups consist of a PE flask to which a carrier system has been attached. In this carrier system a cup filled with a unit sand of 125-200 µm particle size is inserted. At the bottom of the cup a silk cover prevents loss of sand and guarantees free drainage of water from the cup to the carrier and vice versa. Cup and PE flask are hydraulically connected by a cotton wick to ensure constant moisture content throughout the time of measuring, as the initial water content is a crucial point in splash erosion studies (Poesen and Savat 1981). Additionally, vents in the carrier system ensure that the pressure arising from the insertion of the cup does not lead to loss of sand. The vent in the PE flask guarantees the free drainage of excess water which may accumulate during high intensity rainfall events.
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.
Temporal extent:
No information available
Taxonomic extent:
Tree species names are given in the raw data
Measurement cirumstances:
No information available
Data analysis:
Rain event characteristics come from a linked dataset: "Rainfall for rain events within splashcups measurements for kinetic energy of raindrops".

Filter:
Dataset column

Name:
campaign
Definition:
sequential number of the measring campaign
Unit:
No information available
Datagroup:
Helper
Keywords:
No information available
Values:
1
2
3
Contributors:
No information available

Dataset column

Name:
event_no
Definition:
Sequential number of the measured rainfall events
Unit:
No information available
Datagroup:
Rainevent for determinig kinetic energy of rainfalls
Keywords:
precipitation
Values:
1
12
11
10
13
Contributors:
No information available

Dataset column

Name:
CSP
Definition:
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.
Unit:
No information available
Datagroup:
BEF research plot name
Keywords:
CSP
Values:
CSP05
CSP03
CSP08
CSP04
CSP02
Contributors:
No information available

Dataset column

Name:
age_class_3
Definition:
Age class of the CSP (3 classes), copied from the CSP successional stages data set
Unit:
No information available
Datagroup:
Helper
Keywords:
succession
Values:
1
4
3
5
Contributors:
No information available

Dataset column

Name:
age_class_5
Definition:
Age class of the CSP (5 classes), copied from the CSP successional stages data set
Unit:
No information available
Datagroup:
Helper
Keywords:
No information available
Values:
5
4
3
1
2
Contributors:
No information available

Dataset column

Name:
rarefy_100
Definition:
rarefied species richness, copied from the CSP diversity dataset
Unit:
No information available
Datagroup:
Taxonomic biodiversity
Keywords:
biodiversity
Values:
19.83457198
16.77861972
19.18847034
19.92291558
20.18729069
Contributors:
No information available

Dataset column

Name:
shannon
Definition:
shannon diversity of CSP trees, copied from the CSP diversity dataset
Unit:
No information available
Datagroup:
Taxonomic biodiversity
Keywords:
No information available
Values:
2.59877974008667
2.55435250698063
2.63189534329409
2.51963828654328
2.33790930497816
Contributors:
No information available

Dataset column

Name:
simpson
Definition:
simpson diversity of CSP trees, copied from the CSP diversity dataset
Unit:
No information available
Datagroup:
Taxonomic biodiversity
Keywords:
No information available
Values:
0.88173806480979
0.890895936894677
0.86276924203689
0.855971684531093
0.897252720321537
Contributors:
No information available

Dataset column

Name:
event_start
Definition:
start date of the event
Unit:
No information available
Datagroup:
Date time information
Keywords:
date
Values:
2008-08-27
2008-09-03
2008-09-10
2008-08-24
2008-08-30
Contributors:
No information available

Dataset column

Name:
event_end
Definition:
end date of the event
Unit:
No information available
Datagroup:
Date time information
Keywords:
No information available
Values:
2008-08-26
2008-09-05
2008-08-28
2008-09-11
2008-08-31
Contributors:
No information available

Dataset column

Name:
event_mm_bo
Definition:
rainfall amount as measured by the rainfall collecting bottle; copied from the rainfall event overview
Unit:
millimeter
Datagroup:
Helper
Keywords:
precipitation
Values:
103.13
111.14
20.96
2.36
21.11
Contributors:
No information available

Dataset column

Name:
event_mm_va
Definition:
rainfall amount as measured by the Vaisala sensor; copied from the rainfall event overview
Unit:
millimeter
Datagroup:
Helper
Keywords:
No information available
Values:
33.95
26.15
3.8
11.61
1.8
Contributors:
No information available

Dataset column

Name:
event_mm_tb
Definition:
rainfall amount as measured by the tipping bucket rain gauge; copied from the rainfall event overview
Unit:
millimeter
Datagroup:
Helper
Keywords:
No information available
Values:
70
39.9
2.8
83.7
22.3
Contributors:
No information available

Dataset column

Name:
tree_species
Definition:
Species name of the measured tree individual
Unit:
No information available
Datagroup:
Scientific plant species name
Keywords:
species
Values:
Cunninghamia lanceolata
Castanopsis eyrei
Cyclobalanopsis glauca
Castanopsis fargesii
Castanopsis tibetana
Contributors:
No information available

Dataset column

Name:
tree_number
Definition:
Tag number of the tree under which the splashcups were positioned. Consists of 6 digit coding according to the identification and allocation of species as referenced in the dataset 238 ("Tree stem reference list for the Comparative Study Sites (CSPs)"). In the case of tree(s) with additional letters in this cloumn, this refers to individuals mith multiple stems. The letters are used to distinguish between the multiple stems.
Unit:
No information available
Datagroup:
CSP metal tag number (trees, woody debris)
Keywords:
tree
Values:
363640
363046
111111
363799
363080
Contributors:
No information available

Dataset column

Name:
position_scs
Definition:
position_scs
Unit:
No information available
Datagroup:
Splashcup position
Keywords:
splashcup
Values:
103
100
102
101
1
Contributors:
No information available

Dataset column

Name:
tree_height_m
Definition:
Tree height (SP1), copied from the SP1 file on tree size
Unit:
millimeter
Datagroup:
Helper
Keywords:
size
Values:
10.2
10.8
11
10.7
10
Contributors:
No information available

Dataset column

Name:
thoughfall_mm
Definition:
Throughfall as measured by the throughfall collecting bottles
Unit:
millimeter
Datagroup:
Precipitation
Keywords:
precipitation
Values:
101.80505415162456
100.36101083032491
101.08303249097473
10.108303249097473
103.24909747292419
Contributors:
No information available

Dataset column

Name:
loss_sand_g
Definition:
loss of sand from splash cups during the event
Unit:
gram
Datagroup:
Deriving kinetic energy from sand loss
Keywords:
kinetic energy, raindrop
Values:
0.15000000000000568
0
0.12000000000000455
0.12999999999999545
0.05999999999998806
Contributors:
No information available

Dataset column

Name:
loss_sand_g_m2
Definition:
loss of sand from splash cups during the event extrapolated to m²
Unit:
gramPerSquaremeter
Datagroup:
Deriving kinetic energy from sand loss
Keywords:
No information available
Values:
0.7220638027610791
0.9627517370147152
0.7822357863244453
0.9025797534513488
0.36103190138045405
Contributors:
No information available

Dataset column

Name:
KE_area
Definition:
loss of sand from splash cups during the event extrapolated to m² and converted into KE
Unit:
joule per squaremeter
Datagroup:
Deriving kinetic energy from sand loss
Keywords:
kinetic energy, raindrop
Values:
1004.2012078923968
1000.6991984055
1005.9522125505
1004.2012079325001
1001.5747008098547
Contributors:
No information available

No information available


No information available
No information avialable

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27 k%c3%bchn medium

Peter
Kühn

Owner of:
29 Datasets

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Christian
Geißler

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