Main Experiment: Soil P fractions (Hedley), soil pH, soil C and N content (Site A, Ext. A, B and E plots)

Usage Rights

This data is Private.

Usage rights for SP5e members. Acknoledged are: Thomas Scholten, Steffen Seitz, Zhengshan Song for taking soil samples in the field

Dataset 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) .

Dataset 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 Circumstances

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).

Data columns available in the raw data part of this dataset

Plot
Plot within the experimental site
Data group: Plot name Main experiment
Values
BC36
C32
E22
E24
E23
site
site
Data group: Site Main Experiment
Values
A
increment
increment
Data group: Soil depth
Alert Sample values are not displayed because this column hasn't been approved yet.
pi_resin
Inorganic P extracted with Resin bags in 20ml H20 for 16hrs, measured in 0.5M HCL
Unit: µg/g
Data group: Phosphorous
Values
10.545
10.464
10.83
10.806
10.442
* Barbara Weisbrod also contributed to this column.
pi_nahco3
Inorganic P measured in Extract which was shaken in 25ml NaHCO3 for 16hrs 
Unit: µg/g
Data group: Phosphorous
Values
0.832
1.017
1.476
1.498
1.458
* Barbara Weisbrod also contributed to this column.
po_nahco3
Organic P measured in Extract which was shaken in 25ml NaHCO3 for 16hrs
Unit: µg/g
Data group: Phosphorous
Values
12.26
12.101
13.111
10.165
12.291
* Barbara Weisbrod also contributed to this column.
pi_naoh
Inorganic P measured in Extract which was shaken in 25ml NaOH for 16hrs
Unit: µg/g
Data group: Phosphorous
Values
12.442
10.411
11.557
10.575
12.038
* Barbara Weisbrod also contributed to this column.
po_naoh
Organic P measured in Extract which was shaken in 25ml NaOH for 16hrs 
Unit: µg/g
Data group: Phosphorous
Values
106.754
109.401
106.901
107.611
101.096
* Barbara Weisbrod also contributed to this column.
pi_1mhcl
Inorganic P extracted with 20ml 1m HCL for 16hrs
Unit: µg/g
Data group: Phosphorous
Values
0
0.142
0.124
0.117
0.063
* Barbara Weisbrod also contributed to this column.
pi_hcl_conc
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
Data group: Phosphorous
Values
127.84
131.496
128.516
109.465
107.089
* Barbara Weisbrod also contributed to this column.
tp_residual
Total residual P extracted with HNO3-Pressure-Extraction method
Unit: µg/g
Data group: Phosphorous
Values
109.635
106.138
117.337
114.368
105.922
* Barbara Weisbrod also contributed to this column.
tp_initial
Total P after digestion with concentrated nitric acid; 400 mg +3 ml HNO3, 8h 190°C under pressure
Unit: µg/g
Data group: Phosphorous
Values
253.862
198.943
224.385
201.846
274.396
* Barbara Weisbrod also contributed to this column.
pH_H2O
pH value, measured in water.; Datagroup description: pH value
Data group: pH value
Values
4.03
4.09
4.13
4.15
3.97
ph_CaCl
pH value, measured in 0.01 M CaCl2; Datagroup description: pH value
Data group: pH value
Values
3.64
3.73
3.69
3.7
3.74
N
Nitrogen concentration of the soil sample.; Datagroup description: Nitrogen
Unit: perCent 
Data group: Nitrogen
Values
0.142
0.148
0.155
0.151
0.158
C
Carbon concentration of the soil sample.; Datagroup description: Carbon
Unit: perCent 
Data group: Carbon
Values
2.074
1.887
2.097
1.973
1.575
C_N
ratio organic carbon/organic nitrogen 
Unit: ratio
Data group: Carbon Nitrogen ratio 
Values
10.642
10.892
10.841
10.951
10.793