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Title:
Main Experiment: Soil P fractions (Hedley), soil pH, soil C and N content (Site A, Ext. A, B and E plots)
Access rights:
Private
Usage rights:
Usage rights for SP5e members. Acknoledged are: Thomas Scholten, Steffen Seitz, Zhengshan Song for taking soil samples in the field
Published:
No information available
Abstract:
Soil sampling was carried out on a subset of 100 plots of two overlapping extinction scenarios on Site A (Extinction scenario A and B). The samples were collected from young forest communities composed of 1 - 24 species (see general plot information concerning community compositions of the BEF-China experiment: http://china.befdata.biow.uni-leipzig.de/datasets/71; Species nomenclature following the Flora of China). The species composition covers two overlapping species pools and also includes two commercially relevant tree species monocultures (Extinction scenario E, Pinus massoniana and Cunninghamia lanceolata). Moreover, we also sampled plots without trees. Sampling was carried out in October 2014 by SP6 (Ext. A) and July 2015 by SP5 (Ext. B and E) .
Design:
Within the plots, we collected soil samples from 12 random positions which followed a frame around the central 8 x 8 trees of every plot. Soil cores with a diameter of 13 mm were taken from the first ten centimeters of the top layer. These subsamples were pooled plotwise, freshly sieved in 2 mm fraction, homogenized and stored in the fridge for analyses.
Spatial extent:
Plots of Exctinction scenario A and B (http://china.befdata.biow.uni-leipzig.de/datasets/71). 100 plots were sampled, including non-tree community plots and monocultures of Pinus massoniana and Cunninghammi lanceolata (Extinction Scenario E).
Temporal extent:
Sampling was carried out throughout July 2015.
Taxonomic extent:
No tree species were included in the analyses. However, soil cores were taken from communities comprising the following species (and their mixtures according to (http://china.befdata.biow.uni-leipzig.de/datasets/71): Nyssa sinensis Castanea henryi Quercus fabri Lithocarpus glaber Quercus serrata Koelreuteria bipinnata Choerospondias axillaris Castanopsis sclerophylla Triadica sebifera Liquidambar formosana Sapindus saponaria Schima superba Castanopsis eyrei Cyclobalanopsis myrsinifolia Rhus chinensis Cyclobalanopsis glauca Castanopsis carlesii Melia azedarach Triadica cochinchinensis Diospyros japonica Acer davidii Cinnamomum camphora Daphniphyllum oldhamii Quercus acutissima Pinus massoniana Cunninghamia lanceolata
Measurement cirumstances:
hot and wet
Data analysis:
Phosphorus fractions in soils were analyzed by the sequential extraction method according to Hedley (Hedley et al. 1982a). The whole fractionation process used for this data is described in detail by Tiessen and Moir (2008).

Filter:
Dataset column

Name:
Plot
Definition:
Plot within the experimental site
Unit:
No information available
Datagroup:
Plot name Main experiment
Keywords:
No information available
Values:
E22
E24
BC36
E23
C32
Contributors:
No information available

Dataset column

Name:
site
Definition:
site
Unit:
No information available
Datagroup:
Site Main Experiment
Keywords:
No information available
Values:
A
Contributors:
No information available

Dataset column

Name:
increment
Definition:
increment
Unit:
No information available
Datagroup:
Soil depth
Keywords:
No information available
Values:
Sample values are not displayed because this column hasn't been approved yet.
Contributors:
No information available

Dataset column

Name:
pi_resin
Definition:
Inorganic P extracted with Resin bags in 20ml H20 for 16hrs, measured in 0.5M HCL
Unit:
µg/g
Datagroup:
Phosphorous
Keywords:
No information available
Values:
10.83
10.545
10.806
10.442
10.464
Contributors:
Barbara Weisbrod

Dataset column

Name:
pi_nahco3
Definition:
Inorganic P measured in Extract which was shaken in 25ml NaHCO3 for 16hrs 
Unit:
µg/g
Datagroup:
Phosphorous
Keywords:
No information available
Values:
1.498
1.017
1.476
1.458
0.832
Contributors:
Barbara Weisbrod

Dataset column

Name:
po_nahco3
Definition:
Organic P measured in Extract which was shaken in 25ml NaHCO3 for 16hrs
Unit:
µg/g
Datagroup:
Phosphorous
Keywords:
No information available
Values:
12.291
12.101
12.26
13.111
10.165
Contributors:
Barbara Weisbrod

Dataset column

Name:
pi_naoh
Definition:
Inorganic P measured in Extract which was shaken in 25ml NaOH for 16hrs
Unit:
µg/g
Datagroup:
Phosphorous
Keywords:
No information available
Values:
11.557
10.575
12.442
12.038
10.411
Contributors:
Barbara Weisbrod

Dataset column

Name:
po_naoh
Definition:
Organic P measured in Extract which was shaken in 25ml NaOH for 16hrs 
Unit:
µg/g
Datagroup:
Phosphorous
Keywords:
No information available
Values:
107.611
101.096
109.401
106.901
106.754
Contributors:
Barbara Weisbrod

Dataset column

Name:
pi_1mhcl
Definition:
Inorganic P extracted with 20ml 1m HCL for 16hrs
Unit:
µg/g
Datagroup:
Phosphorous
Keywords:
No information available
Values:
0.063
0
0.142
0.117
0.124
Contributors:
Barbara Weisbrod

Dataset column

Name:
pi_hcl_conc
Definition:
Inorganic P measured in Extract which was cooked with 10ml concentrated HCL at 85°C for 20min, after that added an extra 5ml concentrated HCL
Unit:
µg/g
Datagroup:
Phosphorous
Keywords:
No information available
Values:
131.496
107.089
128.516
127.84
109.465
Contributors:
Barbara Weisbrod

Dataset column

Name:
tp_residual
Definition:
Total residual P extracted with HNO3-Pressure-Extraction method
Unit:
µg/g
Datagroup:
Phosphorous
Keywords:
No information available
Values:
106.138
114.368
117.337
105.922
109.635
Contributors:
Barbara Weisbrod

Dataset column

Name:
tp_initial
Definition:
Total P after digestion with concentrated nitric acid; 400 mg +3 ml HNO3, 8h 190°C under pressure
Unit:
µg/g
Datagroup:
Phosphorous
Keywords:
No information available
Values:
198.943
224.385
201.846
253.862
274.396
Contributors:
Barbara Weisbrod

Dataset column

Name:
pH_H2O
Definition:
pH value, measured in water.; Datagroup description: pH value
Unit:
No information available
Datagroup:
pH value
Keywords:
No information available
Values:
3.97
4.15
4.09
4.03
4.13
Contributors:
No information available

Dataset column

Name:
ph_CaCl
Definition:
pH value, measured in 0.01 M CaCl2; Datagroup description: pH value
Unit:
No information available
Datagroup:
pH value
Keywords:
No information available
Values:
3.7
3.64
3.73
3.74
3.69
Contributors:
No information available

Dataset column

Name:
N
Definition:
Nitrogen concentration of the soil sample.; Datagroup description: Nitrogen
Unit:
perCent 
Datagroup:
Nitrogen
Keywords:
No information available
Values:
0.151
0.158
0.142
0.148
0.155
Contributors:
No information available

Dataset column

Name:
C
Definition:
Carbon concentration of the soil sample.; Datagroup description: Carbon
Unit:
perCent 
Datagroup:
Carbon
Keywords:
No information available
Values:
1.887
1.973
1.575
2.074
2.097
Contributors:
No information available

Dataset column

Name:
C_N
Definition:
ratio organic carbon/organic nitrogen 
Unit:
ratio
Datagroup:
Carbon Nitrogen ratio 
Keywords:
No information available
Values:
10.793
10.841
10.642
10.951
10.892
Contributors:
No information available

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